The patch titled
Subject: mm/page_io: count submission time as thrashing delay for delayacct
has been added to the -mm mm-unstable branch. Its filename is
mm-page_io-count-submission-time-as-thrashing-delay-for-delayacct.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_io-count-submission-time-as-thrashing-delay-for-delayacct.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Yang Yang <yang.yang29@xxxxxxxxxx>
Subject: mm/page_io: count submission time as thrashing delay for delayacct
Date: Mon, 15 Aug 2022 07:28:37 +0000
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].
Likes PSI, we count submission time as thrashing delay because when the
device is congested, or the submitting cgroup IO-throttled, submission can
be a significant part of overall IO time.
This patch is based on "delayacct: support re-entrance detection of
thrashing accounting".
[1] commit aae466b0052e ("mm/swap: implement workingset detection for anonymous LRU")
Link: https://lkml.kernel.org/r/20220815072835.74876-1-yang.yang29@xxxxxxxxxx
Signed-off-by: Yang Yang <yang.yang29@xxxxxxxxxx>
Signed-off-by: CGEL ZTE <cgel.zte@xxxxxxxxx>
Reviewed-by: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
Reviewed-by: wangyong <wang.yong12@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_io.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
--- a/mm/page_io.c~mm-page_io-count-submission-time-as-thrashing-delay-for-delayacct
+++ a/mm/page_io.c
@@ -452,18 +452,21 @@ int swap_readpage(struct page *page, boo
struct swap_info_struct *sis = page_swap_info(page);
bool workingset = PageWorkingset(page);
unsigned long pflags;
+ bool in_thrashing;
VM_BUG_ON_PAGE(!PageSwapCache(page) && !synchronous, page);
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(PageUptodate(page), page);
/*
- * Count submission time as memory stall. When the device is congested,
- * or the submitting cgroup IO-throttled, submission can be a
- * significant part of overall IO time.
+ * Count submission time as memory stall and delay. When the device
+ * is congested, or the submitting cgroup IO-throttled, submission
+ * can be a significant part of overall IO time.
*/
- if (workingset)
+ if (workingset) {
+ delayacct_thrashing_start(&in_thrashing);
psi_memstall_enter(&pflags);
+ }
delayacct_swapin_start();
if (frontswap_load(page) == 0) {
@@ -512,8 +515,10 @@ int swap_readpage(struct page *page, boo
bio_put(bio);
out:
- if (workingset)
+ if (workingset) {
+ delayacct_thrashing_end(&in_thrashing);
psi_memstall_leave(&pflags);
+ }
delayacct_swapin_end();
return ret;
}
_
Patches currently in -mm which might be from yang.yang29@xxxxxxxxxx are
mm-vmscan-define-macros-for-refaults-in-struct-lruvec.patch
filemap-make-the-accounting-of-thrashing-more-consistent.patch
mm-vmscan-make-the-annotations-of-refaults-code-at-the-right-place.patch
delayacct-support-re-entrance-detection-of-thrashing-accounting.patch
mm-page_io-count-submission-time-as-thrashing-delay-for-delayacct.patch
