163 строки
3.5 KiB
C
163 строки
3.5 KiB
C
/*
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* f2fs IO tracer
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*
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* Copyright (c) 2014 Motorola Mobility
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* Copyright (c) 2014 Jaegeuk Kim <jaegeuk@kernel.org>
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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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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include <linux/sched.h>
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#include <linux/radix-tree.h>
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#include "f2fs.h"
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#include "trace.h"
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static RADIX_TREE(pids, GFP_ATOMIC);
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static struct mutex pids_lock;
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static struct last_io_info last_io;
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static inline void __print_last_io(void)
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{
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if (!last_io.len)
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return;
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trace_printk("%3x:%3x %4x %-16s %2x %5x %5x %12x %4x\n",
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last_io.major, last_io.minor,
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last_io.pid, "----------------",
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last_io.type,
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last_io.fio.op, last_io.fio.op_flags,
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last_io.fio.new_blkaddr,
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last_io.len);
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memset(&last_io, 0, sizeof(last_io));
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}
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static int __file_type(struct inode *inode, pid_t pid)
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{
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if (f2fs_is_atomic_file(inode))
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return __ATOMIC_FILE;
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else if (f2fs_is_volatile_file(inode))
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return __VOLATILE_FILE;
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else if (S_ISDIR(inode->i_mode))
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return __DIR_FILE;
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else if (inode->i_ino == F2FS_NODE_INO(F2FS_I_SB(inode)))
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return __NODE_FILE;
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else if (inode->i_ino == F2FS_META_INO(F2FS_I_SB(inode)))
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return __META_FILE;
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else if (pid)
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return __NORMAL_FILE;
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else
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return __MISC_FILE;
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}
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void f2fs_trace_pid(struct page *page)
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{
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struct inode *inode = page->mapping->host;
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pid_t pid = task_pid_nr(current);
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void *p;
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set_page_private(page, (unsigned long)pid);
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if (radix_tree_preload(GFP_NOFS))
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return;
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mutex_lock(&pids_lock);
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p = radix_tree_lookup(&pids, pid);
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if (p == current)
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goto out;
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if (p)
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radix_tree_delete(&pids, pid);
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f2fs_radix_tree_insert(&pids, pid, current);
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trace_printk("%3x:%3x %4x %-16s\n",
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MAJOR(inode->i_sb->s_dev), MINOR(inode->i_sb->s_dev),
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pid, current->comm);
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out:
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mutex_unlock(&pids_lock);
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radix_tree_preload_end();
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}
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void f2fs_trace_ios(struct f2fs_io_info *fio, int flush)
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{
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struct inode *inode;
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pid_t pid;
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int major, minor;
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if (flush) {
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__print_last_io();
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return;
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}
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inode = fio->page->mapping->host;
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pid = page_private(fio->page);
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major = MAJOR(inode->i_sb->s_dev);
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minor = MINOR(inode->i_sb->s_dev);
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if (last_io.major == major && last_io.minor == minor &&
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last_io.pid == pid &&
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last_io.type == __file_type(inode, pid) &&
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last_io.fio.op == fio->op &&
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last_io.fio.op_flags == fio->op_flags &&
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last_io.fio.new_blkaddr + last_io.len ==
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fio->new_blkaddr) {
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last_io.len++;
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return;
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}
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__print_last_io();
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last_io.major = major;
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last_io.minor = minor;
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last_io.pid = pid;
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last_io.type = __file_type(inode, pid);
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last_io.fio = *fio;
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last_io.len = 1;
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return;
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}
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void f2fs_build_trace_ios(void)
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{
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mutex_init(&pids_lock);
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}
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#define PIDVEC_SIZE 128
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static unsigned int gang_lookup_pids(pid_t *results, unsigned long first_index,
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unsigned int max_items)
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{
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struct radix_tree_iter iter;
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void **slot;
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unsigned int ret = 0;
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if (unlikely(!max_items))
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return 0;
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radix_tree_for_each_slot(slot, &pids, &iter, first_index) {
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results[ret] = iter.index;
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if (++ret == max_items)
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break;
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}
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return ret;
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}
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void f2fs_destroy_trace_ios(void)
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{
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pid_t pid[PIDVEC_SIZE];
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pid_t next_pid = 0;
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unsigned int found;
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mutex_lock(&pids_lock);
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while ((found = gang_lookup_pids(pid, next_pid, PIDVEC_SIZE))) {
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unsigned idx;
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next_pid = pid[found - 1] + 1;
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for (idx = 0; idx < found; idx++)
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radix_tree_delete(&pids, pid[idx]);
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}
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mutex_unlock(&pids_lock);
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}
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