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mm: vmscan: refactor updating current->reclaim_state

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During reclaim, we keep track of pages reclaimed from other means than
LRU-based reclaim through scan_control->reclaim_state->reclaimed_slab,
which we stash a pointer to in current task_struct.

However, we keep track of more than just reclaimed slab pages through
this.  We also use it for clean file pages dropped through pruned inodes,
and xfs buffer pages freed.  Rename reclaimed_slab to reclaimed, and add a
helper function that wraps updating it through current, so that future
changes to this logic are contained within include/linux/swap.h.

Link: https://lkml.kernel.org/r/20230413104034.1086717-4-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Lameter <cl@linux.com>
Cc: Darrick J. Wong <djwong@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yosry Ahmed 2023-04-13 10:40:34 +00:00 • committed by Andrew Morton
parent ef05e68936
commit c7b23b68e2
6 changed files with 23 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
fs/inode.c
View file

@ -864,8 +864,7 @@ static enum lru_status inode_lru_isolate(struct list_head *item,
__count_vm_events(KSWAPD_INODESTEAL, reap);
else
__count_vm_events(PGINODESTEAL, reap);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += reap;
mm_account_reclaimed_pages(reap);
}
iput(inode);
spin_lock(lru_lock);

3
fs/xfs/xfs_buf.c
View file

@ -286,8 +286,7 @@ xfs_buf_free_pages(
if (bp->b_pages[i])
__free_page(bp->b_pages[i]);
}
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += bp->b_page_count;
mm_account_reclaimed_pages(bp->b_page_count);
if (bp->b_pages != bp->b_page_array)
kmem_free(bp->b_pages);

17
include/linux/swap.h
View file

@ -153,13 +153,28 @@ union swap_header {
* memory reclaim
*/
struct reclaim_state {
unsigned long reclaimed_slab;
/* pages reclaimed outside of LRU-based reclaim */
unsigned long reclaimed;
#ifdef CONFIG_LRU_GEN
/* per-thread mm walk data */
struct lru_gen_mm_walk *mm_walk;
#endif
};
/*
* mm_account_reclaimed_pages(): account reclaimed pages outside of LRU-based
* reclaim
* @pages: number of pages reclaimed
*
* If the current process is undergoing a reclaim operation, increment the
* number of reclaimed pages by @pages.
*/
static inline void mm_account_reclaimed_pages(unsigned long pages)
{
if (current->reclaim_state)
current->reclaim_state->reclaimed += pages;
}
#ifdef __KERNEL__
struct address_space;

3
mm/slab.c
View file

@ -1392,8 +1392,7 @@ static void kmem_freepages(struct kmem_cache *cachep, struct slab *slab)
smp_wmb();
__folio_clear_slab(folio);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += 1 << order;
mm_account_reclaimed_pages(1 << order);
unaccount_slab(slab, order, cachep);
__free_pages(&folio->page, order);
}

6
mm/slob.c
View file

@ -61,7 +61,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/swap.h> /* struct reclaim_state */
#include <linux/swap.h> /* mm_account_reclaimed_pages() */
#include <linux/cache.h>
#include <linux/init.h>
#include <linux/export.h>
@ -211,9 +211,7 @@ static void slob_free_pages(void *b, int order)
{
struct page *sp = virt_to_page(b);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += 1 << order;
mm_account_reclaimed_pages(1 << order);
mod_node_page_state(page_pgdat(sp), NR_SLAB_UNRECLAIMABLE_B,
-(PAGE_SIZE << order));
__free_pages(sp, order);

5
mm/slub.c
View file

@ -11,7 +11,7 @@
*/
#include <linux/mm.h>
#include <linux/swap.h> /* struct reclaim_state */
#include <linux/swap.h> /* mm_account_reclaimed_pages() */
#include <linux/module.h>
#include <linux/bit_spinlock.h>
#include <linux/interrupt.h>
@ -2063,8 +2063,7 @@ static void __free_slab(struct kmem_cache *s, struct slab *slab)
/* Make the mapping reset visible before clearing the flag */
smp_wmb();
__folio_clear_slab(folio);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;
mm_account_reclaimed_pages(pages);
unaccount_slab(slab, order, s);
__free_pages(&folio->page, order);
}