percpu: move fully free chunk reclamation into a work
Impact: code reorganization for later changes Do fully free chunk reclamation using a work. This change is to prepare for locking changes. Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Родитель
9f7dcf224b
Коммит
a56dbddf06
48
mm/percpu.c
48
mm/percpu.c
|
@ -63,6 +63,7 @@
|
|||
#include <linux/rbtree.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/workqueue.h>
|
||||
|
||||
#include <asm/cacheflush.h>
|
||||
#include <asm/tlbflush.h>
|
||||
|
@ -118,6 +119,10 @@ static DEFINE_MUTEX(pcpu_mutex);
|
|||
static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */
|
||||
static struct rb_root pcpu_addr_root = RB_ROOT; /* chunks by address */
|
||||
|
||||
/* reclaim work to release fully free chunks, scheduled from free path */
|
||||
static void pcpu_reclaim(struct work_struct *work);
|
||||
static DECLARE_WORK(pcpu_reclaim_work, pcpu_reclaim);
|
||||
|
||||
static int __pcpu_size_to_slot(int size)
|
||||
{
|
||||
int highbit = fls(size); /* size is in bytes */
|
||||
|
@ -846,13 +851,37 @@ void *__alloc_reserved_percpu(size_t size, size_t align)
|
|||
return pcpu_alloc(size, align, true);
|
||||
}
|
||||
|
||||
static void pcpu_kill_chunk(struct pcpu_chunk *chunk)
|
||||
/**
|
||||
* pcpu_reclaim - reclaim fully free chunks, workqueue function
|
||||
* @work: unused
|
||||
*
|
||||
* Reclaim all fully free chunks except for the first one.
|
||||
*/
|
||||
static void pcpu_reclaim(struct work_struct *work)
|
||||
{
|
||||
WARN_ON(chunk->immutable);
|
||||
pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size, false);
|
||||
list_del(&chunk->list);
|
||||
rb_erase(&chunk->rb_node, &pcpu_addr_root);
|
||||
free_pcpu_chunk(chunk);
|
||||
LIST_HEAD(todo);
|
||||
struct list_head *head = &pcpu_slot[pcpu_nr_slots - 1];
|
||||
struct pcpu_chunk *chunk, *next;
|
||||
|
||||
mutex_lock(&pcpu_mutex);
|
||||
|
||||
list_for_each_entry_safe(chunk, next, head, list) {
|
||||
WARN_ON(chunk->immutable);
|
||||
|
||||
/* spare the first one */
|
||||
if (chunk == list_first_entry(head, struct pcpu_chunk, list))
|
||||
continue;
|
||||
|
||||
rb_erase(&chunk->rb_node, &pcpu_addr_root);
|
||||
list_move(&chunk->list, &todo);
|
||||
}
|
||||
|
||||
mutex_unlock(&pcpu_mutex);
|
||||
|
||||
list_for_each_entry_safe(chunk, next, &todo, list) {
|
||||
pcpu_depopulate_chunk(chunk, 0, pcpu_unit_size, false);
|
||||
free_pcpu_chunk(chunk);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
|
@ -877,14 +906,13 @@ void free_percpu(void *ptr)
|
|||
|
||||
pcpu_free_area(chunk, off);
|
||||
|
||||
/* the chunk became fully free, kill one if there are other free ones */
|
||||
/* if there are more than one fully free chunks, wake up grim reaper */
|
||||
if (chunk->free_size == pcpu_unit_size) {
|
||||
struct pcpu_chunk *pos;
|
||||
|
||||
list_for_each_entry(pos,
|
||||
&pcpu_slot[pcpu_chunk_slot(chunk)], list)
|
||||
list_for_each_entry(pos, &pcpu_slot[pcpu_nr_slots - 1], list)
|
||||
if (pos != chunk) {
|
||||
pcpu_kill_chunk(pos);
|
||||
schedule_work(&pcpu_reclaim_work);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
Загрузка…
Ссылка в новой задаче