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filemap: make the accounting of thrashing more consistent 

Once upon a time, we only support accounting thrashing of page cache. 
Then Joonsoo introduced workingset detection for anonymous pages and we
gained the ability to account thrashing of them[1].

So let delayacct account both the thrashing of page cache and anonymous
pages, this could make the codes more consistent and simpler.

[1] commit aae466b005 ("mm/swap: implement workingset detection for anonymous LRU")

Link: https://lkml.kernel.org/r/20220805033838.1714674-1-yang.yang29@zte.com.cn
Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@gmail.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Yang Yang <yang.yang29@zte.com.cn>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yang Yang 2022-08-05 03:38:39 +00:00 committed by Andrew Morton
parent 5154e60796
commit f347c9d269
2 changed files with 5 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/accounting/delay-accounting.rst
View File

@ -13,7 +13,7 @@ a) waiting for a CPU (while being runnable)
b) completion of synchronous block I/O initiated by the task
c) swapping in pages
d) memory reclaim
e) thrashing page cache
e) thrashing
f) direct compact
g) write-protect copy

18
mm/filemap.c
View File

@ -1221,15 +1221,11 @@ static inline int folio_wait_bit_common(struct folio *folio, int bit_nr,
struct wait_page_queue wait_page;
wait_queue_entry_t *wait = &wait_page.wait;
bool thrashing = false;
bool delayacct = false;
unsigned long pflags;
if (bit_nr == PG_locked &&
!folio_test_uptodate(folio) && folio_test_workingset(folio)) {
if (!folio_test_swapbacked(folio)) {
delayacct_thrashing_start();
delayacct = true;
}
delayacct_thrashing_start();
psi_memstall_enter(&pflags);
thrashing = true;
}
@ -1329,8 +1325,7 @@ repeat:
finish_wait(q, wait);
if (thrashing) {
if (delayacct)
delayacct_thrashing_end();
delayacct_thrashing_end();
psi_memstall_leave(&pflags);
}
@ -1378,17 +1373,13 @@ void migration_entry_wait_on_locked(swp_entry_t entry, pte_t *ptep,
struct wait_page_queue wait_page;
wait_queue_entry_t *wait = &wait_page.wait;
bool thrashing = false;
bool delayacct = false;
unsigned long pflags;
wait_queue_head_t *q;
struct folio *folio = page_folio(pfn_swap_entry_to_page(entry));
q = folio_waitqueue(folio);
if (!folio_test_uptodate(folio) && folio_test_workingset(folio)) {
if (!folio_test_swapbacked(folio)) {
delayacct_thrashing_start();
delayacct = true;
}
delayacct_thrashing_start();
psi_memstall_enter(&pflags);
thrashing = true;
}
@ -1435,8 +1426,7 @@ void migration_entry_wait_on_locked(swp_entry_t entry, pte_t *ptep,
finish_wait(q, wait);
if (thrashing) {
if (delayacct)
delayacct_thrashing_end();
delayacct_thrashing_end();
psi_memstall_leave(&pflags);
}
}