[PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23
Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe
Родитель
6dac40a7ce
Коммит
2056a782f8
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@ -11,4 +11,16 @@ config LBD
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your machine, or if you want to have a raid or loopback device
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bigger than 2TB. Otherwise say N.
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config BLK_DEV_IO_TRACE
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bool "Support for tracing block io actions"
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select RELAY
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select DEBUG_FS
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help
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Say Y here, if you want to be able to trace the block layer actions
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on a given queue. Tracing allows you to see any traffic happening
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on a block device queue. For more information (and the user space
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support tools needed), fetch the blktrace app from:
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git://brick.kernel.dk/data/git/blktrace.git
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source block/Kconfig.iosched
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@ -8,3 +8,5 @@ obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
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obj-$(CONFIG_IOSCHED_AS) += as-iosched.o
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obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
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obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
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obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
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@ -0,0 +1,538 @@
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/*
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* Copyright (C) 2006 Jens Axboe <axboe@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/blktrace_api.h>
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#include <linux/percpu.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/debugfs.h>
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#include <asm/uaccess.h>
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static DEFINE_PER_CPU(unsigned long long, blk_trace_cpu_offset) = { 0, };
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static unsigned int blktrace_seq __read_mostly = 1;
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/*
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* Send out a notify for this process, if we haven't done so since a trace
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* started
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*/
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static void trace_note_tsk(struct blk_trace *bt, struct task_struct *tsk)
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{
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struct blk_io_trace *t;
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t = relay_reserve(bt->rchan, sizeof(*t) + sizeof(tsk->comm));
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if (t) {
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t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
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t->device = bt->dev;
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t->action = BLK_TC_ACT(BLK_TC_NOTIFY);
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t->pid = tsk->pid;
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t->cpu = smp_processor_id();
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t->pdu_len = sizeof(tsk->comm);
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memcpy((void *) t + sizeof(*t), tsk->comm, t->pdu_len);
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tsk->btrace_seq = blktrace_seq;
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}
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}
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static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
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pid_t pid)
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{
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if (((bt->act_mask << BLK_TC_SHIFT) & what) == 0)
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return 1;
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if (sector < bt->start_lba || sector > bt->end_lba)
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return 1;
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if (bt->pid && pid != bt->pid)
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return 1;
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return 0;
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}
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/*
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* Data direction bit lookup
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*/
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static u32 ddir_act[2] __read_mostly = { BLK_TC_ACT(BLK_TC_READ), BLK_TC_ACT(BLK_TC_WRITE) };
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/*
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* Bio action bits of interest
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*/
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static u32 bio_act[3] __read_mostly = { 0, BLK_TC_ACT(BLK_TC_BARRIER), BLK_TC_ACT(BLK_TC_SYNC) };
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/*
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* More could be added as needed, taking care to increment the decrementer
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* to get correct indexing
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*/
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#define trace_barrier_bit(rw) \
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(((rw) & (1 << BIO_RW_BARRIER)) >> (BIO_RW_BARRIER - 0))
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#define trace_sync_bit(rw) \
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(((rw) & (1 << BIO_RW_SYNC)) >> (BIO_RW_SYNC - 1))
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/*
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* The worker for the various blk_add_trace*() types. Fills out a
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* blk_io_trace structure and places it in a per-cpu subbuffer.
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*/
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void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
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int rw, u32 what, int error, int pdu_len, void *pdu_data)
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{
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struct task_struct *tsk = current;
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struct blk_io_trace *t;
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unsigned long flags;
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unsigned long *sequence;
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pid_t pid;
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int cpu;
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if (unlikely(bt->trace_state != Blktrace_running))
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return;
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what |= ddir_act[rw & WRITE];
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what |= bio_act[trace_barrier_bit(rw)];
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what |= bio_act[trace_sync_bit(rw)];
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pid = tsk->pid;
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if (unlikely(act_log_check(bt, what, sector, pid)))
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return;
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/*
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* A word about the locking here - we disable interrupts to reserve
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* some space in the relay per-cpu buffer, to prevent an irq
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* from coming in and stepping on our toes. Once reserved, it's
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* enough to get preemption disabled to prevent read of this data
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* before we are through filling it. get_cpu()/put_cpu() does this
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* for us
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*/
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local_irq_save(flags);
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if (unlikely(tsk->btrace_seq != blktrace_seq))
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trace_note_tsk(bt, tsk);
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t = relay_reserve(bt->rchan, sizeof(*t) + pdu_len);
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if (t) {
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cpu = smp_processor_id();
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sequence = per_cpu_ptr(bt->sequence, cpu);
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t->magic = BLK_IO_TRACE_MAGIC | BLK_IO_TRACE_VERSION;
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t->sequence = ++(*sequence);
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t->time = sched_clock() - per_cpu(blk_trace_cpu_offset, cpu);
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t->sector = sector;
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t->bytes = bytes;
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t->action = what;
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t->pid = pid;
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t->device = bt->dev;
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t->cpu = cpu;
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t->error = error;
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t->pdu_len = pdu_len;
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if (pdu_len)
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memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
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}
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL_GPL(__blk_add_trace);
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static struct dentry *blk_tree_root;
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static struct mutex blk_tree_mutex;
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static unsigned int root_users;
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static inline void blk_remove_root(void)
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{
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if (blk_tree_root) {
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debugfs_remove(blk_tree_root);
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blk_tree_root = NULL;
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}
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}
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static void blk_remove_tree(struct dentry *dir)
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{
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mutex_lock(&blk_tree_mutex);
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debugfs_remove(dir);
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if (--root_users == 0)
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blk_remove_root();
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mutex_unlock(&blk_tree_mutex);
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}
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static struct dentry *blk_create_tree(const char *blk_name)
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{
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struct dentry *dir = NULL;
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mutex_lock(&blk_tree_mutex);
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if (!blk_tree_root) {
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blk_tree_root = debugfs_create_dir("block", NULL);
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if (!blk_tree_root)
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goto err;
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}
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dir = debugfs_create_dir(blk_name, blk_tree_root);
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if (dir)
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root_users++;
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else
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blk_remove_root();
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err:
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mutex_unlock(&blk_tree_mutex);
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return dir;
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}
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static void blk_trace_cleanup(struct blk_trace *bt)
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{
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relay_close(bt->rchan);
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debugfs_remove(bt->dropped_file);
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blk_remove_tree(bt->dir);
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free_percpu(bt->sequence);
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kfree(bt);
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}
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static int blk_trace_remove(request_queue_t *q)
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{
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struct blk_trace *bt;
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bt = xchg(&q->blk_trace, NULL);
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if (!bt)
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return -EINVAL;
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if (bt->trace_state == Blktrace_setup ||
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bt->trace_state == Blktrace_stopped)
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blk_trace_cleanup(bt);
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return 0;
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}
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static int blk_dropped_open(struct inode *inode, struct file *filp)
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{
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filp->private_data = inode->u.generic_ip;
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return 0;
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}
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static ssize_t blk_dropped_read(struct file *filp, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct blk_trace *bt = filp->private_data;
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char buf[16];
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snprintf(buf, sizeof(buf), "%u\n", atomic_read(&bt->dropped));
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return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
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}
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static struct file_operations blk_dropped_fops = {
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.owner = THIS_MODULE,
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.open = blk_dropped_open,
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.read = blk_dropped_read,
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};
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/*
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* Keep track of how many times we encountered a full subbuffer, to aid
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* the user space app in telling how many lost events there were.
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*/
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static int blk_subbuf_start_callback(struct rchan_buf *buf, void *subbuf,
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void *prev_subbuf, size_t prev_padding)
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{
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struct blk_trace *bt;
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if (!relay_buf_full(buf))
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return 1;
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bt = buf->chan->private_data;
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atomic_inc(&bt->dropped);
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return 0;
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}
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static int blk_remove_buf_file_callback(struct dentry *dentry)
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{
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debugfs_remove(dentry);
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return 0;
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}
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static struct dentry *blk_create_buf_file_callback(const char *filename,
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struct dentry *parent,
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int mode,
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struct rchan_buf *buf,
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int *is_global)
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{
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return debugfs_create_file(filename, mode, parent, buf,
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&relay_file_operations);
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}
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static struct rchan_callbacks blk_relay_callbacks = {
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.subbuf_start = blk_subbuf_start_callback,
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.create_buf_file = blk_create_buf_file_callback,
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.remove_buf_file = blk_remove_buf_file_callback,
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};
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/*
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* Setup everything required to start tracing
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*/
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static int blk_trace_setup(request_queue_t *q, struct block_device *bdev,
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char __user *arg)
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{
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struct blk_user_trace_setup buts;
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struct blk_trace *old_bt, *bt = NULL;
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struct dentry *dir = NULL;
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char b[BDEVNAME_SIZE];
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int ret, i;
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if (copy_from_user(&buts, arg, sizeof(buts)))
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return -EFAULT;
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if (!buts.buf_size || !buts.buf_nr)
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return -EINVAL;
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strcpy(buts.name, bdevname(bdev, b));
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/*
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* some device names have larger paths - convert the slashes
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* to underscores for this to work as expected
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*/
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for (i = 0; i < strlen(buts.name); i++)
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if (buts.name[i] == '/')
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buts.name[i] = '_';
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if (copy_to_user(arg, &buts, sizeof(buts)))
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return -EFAULT;
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ret = -ENOMEM;
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bt = kzalloc(sizeof(*bt), GFP_KERNEL);
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if (!bt)
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goto err;
|
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bt->sequence = alloc_percpu(unsigned long);
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if (!bt->sequence)
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goto err;
|
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|
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ret = -ENOENT;
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dir = blk_create_tree(buts.name);
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if (!dir)
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goto err;
|
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|
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bt->dir = dir;
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bt->dev = bdev->bd_dev;
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atomic_set(&bt->dropped, 0);
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ret = -EIO;
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bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, &blk_dropped_fops);
|
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if (!bt->dropped_file)
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goto err;
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bt->rchan = relay_open("trace", dir, buts.buf_size, buts.buf_nr, &blk_relay_callbacks);
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if (!bt->rchan)
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goto err;
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bt->rchan->private_data = bt;
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|
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bt->act_mask = buts.act_mask;
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if (!bt->act_mask)
|
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bt->act_mask = (u16) -1;
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bt->start_lba = buts.start_lba;
|
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bt->end_lba = buts.end_lba;
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if (!bt->end_lba)
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bt->end_lba = -1ULL;
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|
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bt->pid = buts.pid;
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bt->trace_state = Blktrace_setup;
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ret = -EBUSY;
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old_bt = xchg(&q->blk_trace, bt);
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if (old_bt) {
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(void) xchg(&q->blk_trace, old_bt);
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||||
goto err;
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}
|
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|
||||
return 0;
|
||||
err:
|
||||
if (dir)
|
||||
blk_remove_tree(dir);
|
||||
if (bt) {
|
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if (bt->dropped_file)
|
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debugfs_remove(bt->dropped_file);
|
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if (bt->sequence)
|
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free_percpu(bt->sequence);
|
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if (bt->rchan)
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relay_close(bt->rchan);
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kfree(bt);
|
||||
}
|
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return ret;
|
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}
|
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|
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static int blk_trace_startstop(request_queue_t *q, int start)
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{
|
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struct blk_trace *bt;
|
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int ret;
|
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|
||||
if ((bt = q->blk_trace) == NULL)
|
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return -EINVAL;
|
||||
|
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/*
|
||||
* For starting a trace, we can transition from a setup or stopped
|
||||
* trace. For stopping a trace, the state must be running
|
||||
*/
|
||||
ret = -EINVAL;
|
||||
if (start) {
|
||||
if (bt->trace_state == Blktrace_setup ||
|
||||
bt->trace_state == Blktrace_stopped) {
|
||||
blktrace_seq++;
|
||||
smp_mb();
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bt->trace_state = Blktrace_running;
|
||||
ret = 0;
|
||||
}
|
||||
} else {
|
||||
if (bt->trace_state == Blktrace_running) {
|
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bt->trace_state = Blktrace_stopped;
|
||||
relay_flush(bt->rchan);
|
||||
ret = 0;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* blk_trace_ioctl: - handle the ioctls associated with tracing
|
||||
* @bdev: the block device
|
||||
* @cmd: the ioctl cmd
|
||||
* @arg: the argument data, if any
|
||||
*
|
||||
**/
|
||||
int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg)
|
||||
{
|
||||
request_queue_t *q;
|
||||
int ret, start = 0;
|
||||
|
||||
q = bdev_get_queue(bdev);
|
||||
if (!q)
|
||||
return -ENXIO;
|
||||
|
||||
mutex_lock(&bdev->bd_mutex);
|
||||
|
||||
switch (cmd) {
|
||||
case BLKTRACESETUP:
|
||||
ret = blk_trace_setup(q, bdev, arg);
|
||||
break;
|
||||
case BLKTRACESTART:
|
||||
start = 1;
|
||||
case BLKTRACESTOP:
|
||||
ret = blk_trace_startstop(q, start);
|
||||
break;
|
||||
case BLKTRACETEARDOWN:
|
||||
ret = blk_trace_remove(q);
|
||||
break;
|
||||
default:
|
||||
ret = -ENOTTY;
|
||||
break;
|
||||
}
|
||||
|
||||
mutex_unlock(&bdev->bd_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* blk_trace_shutdown: - stop and cleanup trace structures
|
||||
* @q: the request queue associated with the device
|
||||
*
|
||||
**/
|
||||
void blk_trace_shutdown(request_queue_t *q)
|
||||
{
|
||||
blk_trace_startstop(q, 0);
|
||||
blk_trace_remove(q);
|
||||
}
|
||||
|
||||
/*
|
||||
* Average offset over two calls to sched_clock() with a gettimeofday()
|
||||
* in the middle
|
||||
*/
|
||||
static void blk_check_time(unsigned long long *t)
|
||||
{
|
||||
unsigned long long a, b;
|
||||
struct timeval tv;
|
||||
|
||||
a = sched_clock();
|
||||
do_gettimeofday(&tv);
|
||||
b = sched_clock();
|
||||
|
||||
*t = tv.tv_sec * 1000000000 + tv.tv_usec * 1000;
|
||||
*t -= (a + b) / 2;
|
||||
}
|
||||
|
||||
static void blk_trace_check_cpu_time(void *data)
|
||||
{
|
||||
unsigned long long *t;
|
||||
int cpu = get_cpu();
|
||||
|
||||
t = &per_cpu(blk_trace_cpu_offset, cpu);
|
||||
|
||||
/*
|
||||
* Just call it twice, hopefully the second call will be cache hot
|
||||
* and a little more precise
|
||||
*/
|
||||
blk_check_time(t);
|
||||
blk_check_time(t);
|
||||
|
||||
put_cpu();
|
||||
}
|
||||
|
||||
/*
|
||||
* Call blk_trace_check_cpu_time() on each CPU to calibrate our inter-CPU
|
||||
* timings
|
||||
*/
|
||||
static void blk_trace_calibrate_offsets(void)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
smp_call_function(blk_trace_check_cpu_time, NULL, 1, 1);
|
||||
local_irq_save(flags);
|
||||
blk_trace_check_cpu_time(NULL);
|
||||
local_irq_restore(flags);
|
||||
}
|
||||
|
||||
static void blk_trace_set_ht_offsets(void)
|
||||
{
|
||||
#if defined(CONFIG_SCHED_SMT)
|
||||
int cpu, i;
|
||||
|
||||
/*
|
||||
* now make sure HT siblings have the same time offset
|
||||
*/
|
||||
preempt_disable();
|
||||
for_each_online_cpu(cpu) {
|
||||
unsigned long long *cpu_off, *sibling_off;
|
||||
|
||||
for_each_cpu_mask(i, cpu_sibling_map[cpu]) {
|
||||
if (i == cpu)
|
||||
continue;
|
||||
|
||||
cpu_off = &per_cpu(blk_trace_cpu_offset, cpu);
|
||||
sibling_off = &per_cpu(blk_trace_cpu_offset, i);
|
||||
*sibling_off = *cpu_off;
|
||||
}
|
||||
}
|
||||
preempt_enable();
|
||||
#endif
|
||||
}
|
||||
|
||||
static __init int blk_trace_init(void)
|
||||
{
|
||||
mutex_init(&blk_tree_mutex);
|
||||
blk_trace_calibrate_offsets();
|
||||
blk_trace_set_ht_offsets();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
module_init(blk_trace_init);
|
||||
|
||||
|
|
@ -33,6 +33,7 @@
|
|||
#include <linux/init.h>
|
||||
#include <linux/compiler.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
|
||||
#include <asm/uaccess.h>
|
||||
|
||||
|
|
@ -333,6 +334,8 @@ void elv_insert(request_queue_t *q, struct request *rq, int where)
|
|||
struct list_head *pos;
|
||||
unsigned ordseq;
|
||||
|
||||
blk_add_trace_rq(q, rq, BLK_TA_INSERT);
|
||||
|
||||
rq->q = q;
|
||||
|
||||
switch (where) {
|
||||
|
|
@ -499,6 +502,7 @@ struct request *elv_next_request(request_queue_t *q)
|
|||
* not be passed by new incoming requests
|
||||
*/
|
||||
rq->flags |= REQ_STARTED;
|
||||
blk_add_trace_rq(q, rq, BLK_TA_ISSUE);
|
||||
}
|
||||
|
||||
if (!q->boundary_rq || q->boundary_rq == rq) {
|
||||
|
|
|
|||
|
|
@ -5,6 +5,7 @@
|
|||
#include <linux/backing-dev.h>
|
||||
#include <linux/buffer_head.h>
|
||||
#include <linux/smp_lock.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
#include <asm/uaccess.h>
|
||||
|
||||
static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
|
||||
|
|
@ -189,6 +190,11 @@ static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
|
|||
return put_ulong(arg, bdev->bd_inode->i_size >> 9);
|
||||
case BLKGETSIZE64:
|
||||
return put_u64(arg, bdev->bd_inode->i_size);
|
||||
case BLKTRACESTART:
|
||||
case BLKTRACESTOP:
|
||||
case BLKTRACESETUP:
|
||||
case BLKTRACETEARDOWN:
|
||||
return blk_trace_ioctl(bdev, cmd, (char __user *) arg);
|
||||
}
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -28,6 +28,7 @@
|
|||
#include <linux/writeback.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
|
||||
/*
|
||||
* for max sense size
|
||||
|
|
@ -1556,8 +1557,10 @@ void blk_plug_device(request_queue_t *q)
|
|||
if (test_bit(QUEUE_FLAG_STOPPED, &q->queue_flags))
|
||||
return;
|
||||
|
||||
if (!test_and_set_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags))
|
||||
if (!test_and_set_bit(QUEUE_FLAG_PLUGGED, &q->queue_flags)) {
|
||||
mod_timer(&q->unplug_timer, jiffies + q->unplug_delay);
|
||||
blk_add_trace_generic(q, NULL, 0, BLK_TA_PLUG);
|
||||
}
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(blk_plug_device);
|
||||
|
|
@ -1621,14 +1624,21 @@ static void blk_backing_dev_unplug(struct backing_dev_info *bdi,
|
|||
/*
|
||||
* devices don't necessarily have an ->unplug_fn defined
|
||||
*/
|
||||
if (q->unplug_fn)
|
||||
if (q->unplug_fn) {
|
||||
blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_IO, NULL,
|
||||
q->rq.count[READ] + q->rq.count[WRITE]);
|
||||
|
||||
q->unplug_fn(q);
|
||||
}
|
||||
}
|
||||
|
||||
static void blk_unplug_work(void *data)
|
||||
{
|
||||
request_queue_t *q = data;
|
||||
|
||||
blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_IO, NULL,
|
||||
q->rq.count[READ] + q->rq.count[WRITE]);
|
||||
|
||||
q->unplug_fn(q);
|
||||
}
|
||||
|
||||
|
|
@ -1636,6 +1646,9 @@ static void blk_unplug_timeout(unsigned long data)
|
|||
{
|
||||
request_queue_t *q = (request_queue_t *)data;
|
||||
|
||||
blk_add_trace_pdu_int(q, BLK_TA_UNPLUG_TIMER, NULL,
|
||||
q->rq.count[READ] + q->rq.count[WRITE]);
|
||||
|
||||
kblockd_schedule_work(&q->unplug_work);
|
||||
}
|
||||
|
||||
|
|
@ -1753,6 +1766,9 @@ static void blk_release_queue(struct kobject *kobj)
|
|||
if (q->queue_tags)
|
||||
__blk_queue_free_tags(q);
|
||||
|
||||
if (q->blk_trace)
|
||||
blk_trace_shutdown(q);
|
||||
|
||||
kmem_cache_free(requestq_cachep, q);
|
||||
}
|
||||
|
||||
|
|
@ -2129,6 +2145,8 @@ rq_starved:
|
|||
|
||||
rq_init(q, rq);
|
||||
rq->rl = rl;
|
||||
|
||||
blk_add_trace_generic(q, bio, rw, BLK_TA_GETRQ);
|
||||
out:
|
||||
return rq;
|
||||
}
|
||||
|
|
@ -2157,6 +2175,8 @@ static struct request *get_request_wait(request_queue_t *q, int rw,
|
|||
if (!rq) {
|
||||
struct io_context *ioc;
|
||||
|
||||
blk_add_trace_generic(q, bio, rw, BLK_TA_SLEEPRQ);
|
||||
|
||||
__generic_unplug_device(q);
|
||||
spin_unlock_irq(q->queue_lock);
|
||||
io_schedule();
|
||||
|
|
@ -2210,6 +2230,8 @@ EXPORT_SYMBOL(blk_get_request);
|
|||
*/
|
||||
void blk_requeue_request(request_queue_t *q, struct request *rq)
|
||||
{
|
||||
blk_add_trace_rq(q, rq, BLK_TA_REQUEUE);
|
||||
|
||||
if (blk_rq_tagged(rq))
|
||||
blk_queue_end_tag(q, rq);
|
||||
|
||||
|
|
@ -2844,6 +2866,8 @@ static int __make_request(request_queue_t *q, struct bio *bio)
|
|||
if (!q->back_merge_fn(q, req, bio))
|
||||
break;
|
||||
|
||||
blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE);
|
||||
|
||||
req->biotail->bi_next = bio;
|
||||
req->biotail = bio;
|
||||
req->nr_sectors = req->hard_nr_sectors += nr_sectors;
|
||||
|
|
@ -2859,6 +2883,8 @@ static int __make_request(request_queue_t *q, struct bio *bio)
|
|||
if (!q->front_merge_fn(q, req, bio))
|
||||
break;
|
||||
|
||||
blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE);
|
||||
|
||||
bio->bi_next = req->bio;
|
||||
req->bio = bio;
|
||||
|
||||
|
|
@ -2976,6 +3002,7 @@ void generic_make_request(struct bio *bio)
|
|||
request_queue_t *q;
|
||||
sector_t maxsector;
|
||||
int ret, nr_sectors = bio_sectors(bio);
|
||||
dev_t old_dev;
|
||||
|
||||
might_sleep();
|
||||
/* Test device or partition size, when known. */
|
||||
|
|
@ -3002,6 +3029,8 @@ void generic_make_request(struct bio *bio)
|
|||
* NOTE: we don't repeat the blk_size check for each new device.
|
||||
* Stacking drivers are expected to know what they are doing.
|
||||
*/
|
||||
maxsector = -1;
|
||||
old_dev = 0;
|
||||
do {
|
||||
char b[BDEVNAME_SIZE];
|
||||
|
||||
|
|
@ -3034,6 +3063,15 @@ end_io:
|
|||
*/
|
||||
blk_partition_remap(bio);
|
||||
|
||||
if (maxsector != -1)
|
||||
blk_add_trace_remap(q, bio, old_dev, bio->bi_sector,
|
||||
maxsector);
|
||||
|
||||
blk_add_trace_bio(q, bio, BLK_TA_QUEUE);
|
||||
|
||||
maxsector = bio->bi_sector;
|
||||
old_dev = bio->bi_bdev->bd_dev;
|
||||
|
||||
ret = q->make_request_fn(q, bio);
|
||||
} while (ret);
|
||||
}
|
||||
|
|
@ -3153,6 +3191,8 @@ static int __end_that_request_first(struct request *req, int uptodate,
|
|||
int total_bytes, bio_nbytes, error, next_idx = 0;
|
||||
struct bio *bio;
|
||||
|
||||
blk_add_trace_rq(req->q, req, BLK_TA_COMPLETE);
|
||||
|
||||
/*
|
||||
* extend uptodate bool to allow < 0 value to be direct io error
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -38,6 +38,7 @@
|
|||
#include <linux/hdreg.h>
|
||||
#include <linux/spinlock.h>
|
||||
#include <linux/compat.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
|
|
@ -2331,6 +2332,7 @@ static inline void complete_command( ctlr_info_t *h, CommandList_struct *cmd,
|
|||
|
||||
cmd->rq->completion_data = cmd;
|
||||
cmd->rq->errors = status;
|
||||
blk_add_trace_rq(cmd->rq->q, cmd->rq, BLK_TA_COMPLETE);
|
||||
blk_complete_request(cmd->rq);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -17,6 +17,7 @@
|
|||
#include <linux/mempool.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/idr.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
|
||||
static const char *_name = DM_NAME;
|
||||
|
||||
|
|
@ -334,6 +335,8 @@ static void dec_pending(struct dm_io *io, int error)
|
|||
/* nudge anyone waiting on suspend queue */
|
||||
wake_up(&io->md->wait);
|
||||
|
||||
blk_add_trace_bio(io->md->queue, io->bio, BLK_TA_COMPLETE);
|
||||
|
||||
bio_endio(io->bio, io->bio->bi_size, io->error);
|
||||
free_io(io->md, io);
|
||||
}
|
||||
|
|
@ -392,6 +395,7 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
|
|||
struct target_io *tio)
|
||||
{
|
||||
int r;
|
||||
sector_t sector;
|
||||
|
||||
/*
|
||||
* Sanity checks.
|
||||
|
|
@ -407,10 +411,17 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
|
|||
* this io.
|
||||
*/
|
||||
atomic_inc(&tio->io->io_count);
|
||||
sector = clone->bi_sector;
|
||||
r = ti->type->map(ti, clone, &tio->info);
|
||||
if (r > 0)
|
||||
if (r > 0) {
|
||||
/* the bio has been remapped so dispatch it */
|
||||
|
||||
blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
|
||||
tio->io->bio->bi_bdev->bd_dev, sector,
|
||||
clone->bi_sector);
|
||||
|
||||
generic_make_request(clone);
|
||||
}
|
||||
|
||||
else if (r < 0) {
|
||||
/* error the io and bail out */
|
||||
|
|
|
|||
4
fs/bio.c
4
fs/bio.c
|
|
@ -25,6 +25,7 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/mempool.h>
|
||||
#include <linux/workqueue.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
#include <scsi/sg.h> /* for struct sg_iovec */
|
||||
|
||||
#define BIO_POOL_SIZE 256
|
||||
|
|
@ -1095,6 +1096,9 @@ struct bio_pair *bio_split(struct bio *bi, mempool_t *pool, int first_sectors)
|
|||
if (!bp)
|
||||
return bp;
|
||||
|
||||
blk_add_trace_pdu_int(bdev_get_queue(bi->bi_bdev), BLK_TA_SPLIT, bi,
|
||||
bi->bi_sector + first_sectors);
|
||||
|
||||
BUG_ON(bi->bi_vcnt != 1);
|
||||
BUG_ON(bi->bi_idx != 0);
|
||||
atomic_set(&bp->cnt, 3);
|
||||
|
|
|
|||
|
|
@ -72,6 +72,7 @@
|
|||
#include <linux/i2c-dev.h>
|
||||
#include <linux/wireless.h>
|
||||
#include <linux/atalk.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
|
||||
#include <net/sock.h> /* siocdevprivate_ioctl */
|
||||
#include <net/bluetooth/bluetooth.h>
|
||||
|
|
|
|||
|
|
@ -22,6 +22,7 @@ typedef struct request_queue request_queue_t;
|
|||
struct elevator_queue;
|
||||
typedef struct elevator_queue elevator_t;
|
||||
struct request_pm_state;
|
||||
struct blk_trace;
|
||||
|
||||
#define BLKDEV_MIN_RQ 4
|
||||
#define BLKDEV_MAX_RQ 128 /* Default maximum */
|
||||
|
|
@ -416,6 +417,8 @@ struct request_queue
|
|||
unsigned int sg_reserved_size;
|
||||
int node;
|
||||
|
||||
struct blk_trace *blk_trace;
|
||||
|
||||
/*
|
||||
* reserved for flush operations
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,277 @@
|
|||
#ifndef BLKTRACE_H
|
||||
#define BLKTRACE_H
|
||||
|
||||
#include <linux/config.h>
|
||||
#include <linux/blkdev.h>
|
||||
#include <linux/relay.h>
|
||||
|
||||
/*
|
||||
* Trace categories
|
||||
*/
|
||||
enum blktrace_cat {
|
||||
BLK_TC_READ = 1 << 0, /* reads */
|
||||
BLK_TC_WRITE = 1 << 1, /* writes */
|
||||
BLK_TC_BARRIER = 1 << 2, /* barrier */
|
||||
BLK_TC_SYNC = 1 << 3, /* barrier */
|
||||
BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
|
||||
BLK_TC_REQUEUE = 1 << 5, /* requeueing */
|
||||
BLK_TC_ISSUE = 1 << 6, /* issue */
|
||||
BLK_TC_COMPLETE = 1 << 7, /* completions */
|
||||
BLK_TC_FS = 1 << 8, /* fs requests */
|
||||
BLK_TC_PC = 1 << 9, /* pc requests */
|
||||
BLK_TC_NOTIFY = 1 << 10, /* special message */
|
||||
|
||||
BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
|
||||
};
|
||||
|
||||
#define BLK_TC_SHIFT (16)
|
||||
#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
|
||||
|
||||
/*
|
||||
* Basic trace actions
|
||||
*/
|
||||
enum blktrace_act {
|
||||
__BLK_TA_QUEUE = 1, /* queued */
|
||||
__BLK_TA_BACKMERGE, /* back merged to existing rq */
|
||||
__BLK_TA_FRONTMERGE, /* front merge to existing rq */
|
||||
__BLK_TA_GETRQ, /* allocated new request */
|
||||
__BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
|
||||
__BLK_TA_REQUEUE, /* request requeued */
|
||||
__BLK_TA_ISSUE, /* sent to driver */
|
||||
__BLK_TA_COMPLETE, /* completed by driver */
|
||||
__BLK_TA_PLUG, /* queue was plugged */
|
||||
__BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
|
||||
__BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
|
||||
__BLK_TA_INSERT, /* insert request */
|
||||
__BLK_TA_SPLIT, /* bio was split */
|
||||
__BLK_TA_BOUNCE, /* bio was bounced */
|
||||
__BLK_TA_REMAP, /* bio was remapped */
|
||||
};
|
||||
|
||||
/*
|
||||
* Trace actions in full. Additionally, read or write is masked
|
||||
*/
|
||||
#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
|
||||
#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
|
||||
#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
|
||||
#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
|
||||
#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
|
||||
#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
|
||||
|
||||
#define BLK_IO_TRACE_MAGIC 0x65617400
|
||||
#define BLK_IO_TRACE_VERSION 0x07
|
||||
|
||||
/*
|
||||
* The trace itself
|
||||
*/
|
||||
struct blk_io_trace {
|
||||
u32 magic; /* MAGIC << 8 | version */
|
||||
u32 sequence; /* event number */
|
||||
u64 time; /* in microseconds */
|
||||
u64 sector; /* disk offset */
|
||||
u32 bytes; /* transfer length */
|
||||
u32 action; /* what happened */
|
||||
u32 pid; /* who did it */
|
||||
u32 device; /* device number */
|
||||
u32 cpu; /* on what cpu did it happen */
|
||||
u16 error; /* completion error */
|
||||
u16 pdu_len; /* length of data after this trace */
|
||||
};
|
||||
|
||||
/*
|
||||
* The remap event
|
||||
*/
|
||||
struct blk_io_trace_remap {
|
||||
u32 device;
|
||||
u32 __pad;
|
||||
u64 sector;
|
||||
};
|
||||
|
||||
enum {
|
||||
Blktrace_setup = 1,
|
||||
Blktrace_running,
|
||||
Blktrace_stopped,
|
||||
};
|
||||
|
||||
struct blk_trace {
|
||||
int trace_state;
|
||||
struct rchan *rchan;
|
||||
unsigned long *sequence;
|
||||
u16 act_mask;
|
||||
u64 start_lba;
|
||||
u64 end_lba;
|
||||
u32 pid;
|
||||
u32 dev;
|
||||
struct dentry *dir;
|
||||
struct dentry *dropped_file;
|
||||
atomic_t dropped;
|
||||
};
|
||||
|
||||
/*
|
||||
* User setup structure passed with BLKTRACESTART
|
||||
*/
|
||||
struct blk_user_trace_setup {
|
||||
char name[BDEVNAME_SIZE]; /* output */
|
||||
u16 act_mask; /* input */
|
||||
u32 buf_size; /* input */
|
||||
u32 buf_nr; /* input */
|
||||
u64 start_lba;
|
||||
u64 end_lba;
|
||||
u32 pid;
|
||||
};
|
||||
|
||||
#if defined(CONFIG_BLK_DEV_IO_TRACE)
|
||||
extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
|
||||
extern void blk_trace_shutdown(request_queue_t *);
|
||||
extern void __blk_add_trace(struct blk_trace *, sector_t, int, int, u32, int, int, void *);
|
||||
|
||||
/**
|
||||
* blk_add_trace_rq - Add a trace for a request oriented action
|
||||
* @q: queue the io is for
|
||||
* @rq: the source request
|
||||
* @what: the action
|
||||
*
|
||||
* Description:
|
||||
* Records an action against a request. Will log the bio offset + size.
|
||||
*
|
||||
**/
|
||||
static inline void blk_add_trace_rq(struct request_queue *q, struct request *rq,
|
||||
u32 what)
|
||||
{
|
||||
struct blk_trace *bt = q->blk_trace;
|
||||
int rw = rq->flags & 0x07;
|
||||
|
||||
if (likely(!bt))
|
||||
return;
|
||||
|
||||
if (blk_pc_request(rq)) {
|
||||
what |= BLK_TC_ACT(BLK_TC_PC);
|
||||
__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors, sizeof(rq->cmd), rq->cmd);
|
||||
} else {
|
||||
what |= BLK_TC_ACT(BLK_TC_FS);
|
||||
__blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9, rw, what, rq->errors, 0, NULL);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* blk_add_trace_bio - Add a trace for a bio oriented action
|
||||
* @q: queue the io is for
|
||||
* @bio: the source bio
|
||||
* @what: the action
|
||||
*
|
||||
* Description:
|
||||
* Records an action against a bio. Will log the bio offset + size.
|
||||
*
|
||||
**/
|
||||
static inline void blk_add_trace_bio(struct request_queue *q, struct bio *bio,
|
||||
u32 what)
|
||||
{
|
||||
struct blk_trace *bt = q->blk_trace;
|
||||
|
||||
if (likely(!bt))
|
||||
return;
|
||||
|
||||
__blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), 0, NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
* blk_add_trace_generic - Add a trace for a generic action
|
||||
* @q: queue the io is for
|
||||
* @bio: the source bio
|
||||
* @rw: the data direction
|
||||
* @what: the action
|
||||
*
|
||||
* Description:
|
||||
* Records a simple trace
|
||||
*
|
||||
**/
|
||||
static inline void blk_add_trace_generic(struct request_queue *q,
|
||||
struct bio *bio, int rw, u32 what)
|
||||
{
|
||||
struct blk_trace *bt = q->blk_trace;
|
||||
|
||||
if (likely(!bt))
|
||||
return;
|
||||
|
||||
if (bio)
|
||||
blk_add_trace_bio(q, bio, what);
|
||||
else
|
||||
__blk_add_trace(bt, 0, 0, rw, what, 0, 0, NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
* blk_add_trace_pdu_int - Add a trace for a bio with an integer payload
|
||||
* @q: queue the io is for
|
||||
* @what: the action
|
||||
* @bio: the source bio
|
||||
* @pdu: the integer payload
|
||||
*
|
||||
* Description:
|
||||
* Adds a trace with some integer payload. This might be an unplug
|
||||
* option given as the action, with the depth at unplug time given
|
||||
* as the payload
|
||||
*
|
||||
**/
|
||||
static inline void blk_add_trace_pdu_int(struct request_queue *q, u32 what,
|
||||
struct bio *bio, unsigned int pdu)
|
||||
{
|
||||
struct blk_trace *bt = q->blk_trace;
|
||||
u64 rpdu = cpu_to_be64(pdu);
|
||||
|
||||
if (likely(!bt))
|
||||
return;
|
||||
|
||||
if (bio)
|
||||
__blk_add_trace(bt, bio->bi_sector, bio->bi_size, bio->bi_rw, what, !bio_flagged(bio, BIO_UPTODATE), sizeof(rpdu), &rpdu);
|
||||
else
|
||||
__blk_add_trace(bt, 0, 0, 0, what, 0, sizeof(rpdu), &rpdu);
|
||||
}
|
||||
|
||||
/**
|
||||
* blk_add_trace_remap - Add a trace for a remap operation
|
||||
* @q: queue the io is for
|
||||
* @bio: the source bio
|
||||
* @dev: target device
|
||||
* @from: source sector
|
||||
* @to: target sector
|
||||
*
|
||||
* Description:
|
||||
* Device mapper or raid target sometimes need to split a bio because
|
||||
* it spans a stripe (or similar). Add a trace for that action.
|
||||
*
|
||||
**/
|
||||
static inline void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
|
||||
dev_t dev, sector_t from, sector_t to)
|
||||
{
|
||||
struct blk_trace *bt = q->blk_trace;
|
||||
struct blk_io_trace_remap r;
|
||||
|
||||
if (likely(!bt))
|
||||
return;
|
||||
|
||||
r.device = cpu_to_be32(dev);
|
||||
r.sector = cpu_to_be64(to);
|
||||
|
||||
__blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_BLK_DEV_IO_TRACE */
|
||||
#define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
|
||||
#define blk_trace_shutdown(q) do { } while (0)
|
||||
#define blk_add_trace_rq(q, rq, what) do { } while (0)
|
||||
#define blk_add_trace_bio(q, rq, what) do { } while (0)
|
||||
#define blk_add_trace_generic(q, rq, rw, what) do { } while (0)
|
||||
#define blk_add_trace_pdu_int(q, what, bio, pdu) do { } while (0)
|
||||
#define blk_add_trace_remap(q, bio, dev, f, t) do {} while (0)
|
||||
#endif /* CONFIG_BLK_DEV_IO_TRACE */
|
||||
|
||||
#endif
|
||||
|
|
@ -97,6 +97,10 @@ COMPATIBLE_IOCTL(BLKRRPART)
|
|||
COMPATIBLE_IOCTL(BLKFLSBUF)
|
||||
COMPATIBLE_IOCTL(BLKSECTSET)
|
||||
COMPATIBLE_IOCTL(BLKSSZGET)
|
||||
COMPATIBLE_IOCTL(BLKTRACESTART)
|
||||
COMPATIBLE_IOCTL(BLKTRACESTOP)
|
||||
COMPATIBLE_IOCTL(BLKTRACESETUP)
|
||||
COMPATIBLE_IOCTL(BLKTRACETEARDOWN)
|
||||
ULONG_IOCTL(BLKRASET)
|
||||
ULONG_IOCTL(BLKFRASET)
|
||||
/* RAID */
|
||||
|
|
|
|||
|
|
@ -197,6 +197,10 @@ extern int dir_notify_enable;
|
|||
#define BLKBSZGET _IOR(0x12,112,size_t)
|
||||
#define BLKBSZSET _IOW(0x12,113,size_t)
|
||||
#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* return device size in bytes (u64 *arg) */
|
||||
#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
|
||||
#define BLKTRACESTART _IO(0x12,116)
|
||||
#define BLKTRACESTOP _IO(0x12,117)
|
||||
#define BLKTRACETEARDOWN _IO(0x12,118)
|
||||
|
||||
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
|
||||
#define FIBMAP _IO(0x00,1) /* bmap access */
|
||||
|
|
|
|||
|
|
@ -706,6 +706,7 @@ struct task_struct {
|
|||
prio_array_t *array;
|
||||
|
||||
unsigned short ioprio;
|
||||
unsigned int btrace_seq;
|
||||
|
||||
unsigned long sleep_avg;
|
||||
unsigned long long timestamp, last_ran;
|
||||
|
|
|
|||
|
|
@ -181,6 +181,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
|
|||
/* One for us, one for whoever does the "release_task()" (usually parent) */
|
||||
atomic_set(&tsk->usage,2);
|
||||
atomic_set(&tsk->fs_excl, 0);
|
||||
tsk->btrace_seq = 0;
|
||||
return tsk;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -26,6 +26,7 @@
|
|||
#include <linux/init.h>
|
||||
#include <linux/hash.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/blktrace_api.h>
|
||||
#include <asm/tlbflush.h>
|
||||
|
||||
static mempool_t *page_pool, *isa_page_pool;
|
||||
|
|
@ -483,6 +484,8 @@ void blk_queue_bounce(request_queue_t *q, struct bio **bio_orig)
|
|||
pool = isa_page_pool;
|
||||
}
|
||||
|
||||
blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
|
||||
|
||||
/*
|
||||
* slow path
|
||||
*/
|
||||
|
|
|
|||
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