Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-04 04:06:26 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

mm/swap: fold lru_rotate into cpu_fbatches

Browse Source 
Fold lru_rotate into cpu_fbatches, and rename the folio_batch and the lock
protecting it to lru_move_tail and lock_irq respectively so that all the
boilerplate can be removed at the end of this series.

Also remove data_race() around folio_batch_count(), which is out of place:
all folio_batch_count() calls on remote cpu_fbatches are subject to
data_race(), and therefore data_race() should be inside
folio_batch_count().

Link: https://lkml.kernel.org/r/20240711021317.596178-4-yuzhao@google.com
Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yu Zhao 2024-07-10 20:13:15 -06:00 committed by Andrew Morton
parent 380d705493
commit 2f52c77128
1 changed files with 16 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
mm/swap.c
View File

@ -47,20 +47,11 @@
int page_cluster;
const int page_cluster_max = 31;
/* Protecting only lru_rotate.fbatch which requires disabling interrupts */
struct lru_rotate {
local_lock_t lock;
struct folio_batch fbatch;
};
static DEFINE_PER_CPU(struct lru_rotate, lru_rotate) = {
.lock = INIT_LOCAL_LOCK(lock),
};
/*
* The following folio batches are grouped together because they are protected
* by disabling preemption (and interrupts remain enabled).
*/
struct cpu_fbatches {
/*
* The following folio batches are grouped together because they are protected
* by disabling preemption (and interrupts remain enabled).
*/
local_lock_t lock;
struct folio_batch lru_add;
struct folio_batch lru_deactivate_file;
@ -69,9 +60,14 @@ struct cpu_fbatches {
#ifdef CONFIG_SMP
struct folio_batch lru_activate;
#endif
/* Protecting the following batches which require disabling interrupts */
local_lock_t lock_irq;
struct folio_batch lru_move_tail;
};
static DEFINE_PER_CPU(struct cpu_fbatches, cpu_fbatches) = {
.lock = INIT_LOCAL_LOCK(lock),
.lock_irq = INIT_LOCAL_LOCK(lock_irq),
};
static void __page_cache_release(struct folio *folio, struct lruvec **lruvecp,
@ -267,10 +263,10 @@ void folio_rotate_reclaimable(struct folio *folio)
return;
}
local_lock_irqsave(&lru_rotate.lock, flags);
fbatch = this_cpu_ptr(&lru_rotate.fbatch);
local_lock_irqsave(&cpu_fbatches.lock_irq, flags);
fbatch = this_cpu_ptr(&cpu_fbatches.lru_move_tail);
folio_batch_add_and_move(fbatch, folio, lru_move_tail_fn);
local_unlock_irqrestore(&lru_rotate.lock, flags);
local_unlock_irqrestore(&cpu_fbatches.lock_irq, flags);
}
void lru_note_cost(struct lruvec *lruvec, bool file,
@ -668,15 +664,15 @@ void lru_add_drain_cpu(int cpu)
if (folio_batch_count(fbatch))
folio_batch_move_lru(fbatch, lru_add_fn);
fbatch = &per_cpu(lru_rotate.fbatch, cpu);
fbatch = &fbatches->lru_move_tail;
/* Disabling interrupts below acts as a compiler barrier. */
if (data_race(folio_batch_count(fbatch))) {
unsigned long flags;
/* No harm done if a racing interrupt already did this */
local_lock_irqsave(&lru_rotate.lock, flags);
local_lock_irqsave(&cpu_fbatches.lock_irq, flags);
folio_batch_move_lru(fbatch, lru_move_tail_fn);
local_unlock_irqrestore(&lru_rotate.lock, flags);
local_unlock_irqrestore(&cpu_fbatches.lock_irq, flags);
}
fbatch = &fbatches->lru_deactivate_file;
@ -825,7 +821,7 @@ static bool cpu_needs_drain(unsigned int cpu)
/* Check these in order of likelihood that they're not zero */
return folio_batch_count(&fbatches->lru_add) ||
data_race(folio_batch_count(&per_cpu(lru_rotate.fbatch, cpu))) ||
folio_batch_count(&fbatches->lru_move_tail) ||
folio_batch_count(&fbatches->lru_deactivate_file) ||
folio_batch_count(&fbatches->lru_deactivate) ||
folio_batch_count(&fbatches->lru_lazyfree) ||