The patch titled
Subject: delayacct: add memory reclaim delay in get_page_from_freelist
has been added to the -mm mm-unstable branch. Its filename is
delayacct-add-memory-reclaim-delay-in-get_page_from_freelist.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/delayacct-add-memory-reclaim-delay-in-get_page_from_freelist.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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------------------------------------------------------
From: liwenyu <wenyuli@xxxxxxxxxxxxxxx>
Subject: delayacct: add memory reclaim delay in get_page_from_freelist
Date: Wed, 20 Sep 2023 17:38:49 +0800
The current memory reclaim delay statistics only count the direct memory
reclaim of the task in do_try_to_free_pages(). In systems with NUMA open,
some tasks occasionally experience slower response times, but the total
count of reclaim does not increase, using ftrace can show that
node_reclaim has occurred.
The memory reclaim occurring in get_page_from_freelist() is also due to
heavy memory load. To get the impact of tasks in memory reclaim, this
patch adds the statistics of the memory reclaim delay statistics for
__node_reclaim().
Link: https://lkml.kernel.org/r/181C946095F0252B+7cc60eca-1abf-4502-aad3-ffd8ef89d910@xxxxxxxxxxxxxxx
Signed-off-by: Wen Yu Li <wenyuli@xxxxxxxxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: <wangyun@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/vmscan.c~delayacct-add-memory-reclaim-delay-in-get_page_from_freelist
+++ a/mm/vmscan.c
@@ -7350,6 +7350,7 @@ static int __node_reclaim(struct pglist_
cond_resched();
psi_memstall_enter(&pflags);
+ delayacct_freepages_start();
fs_reclaim_acquire(sc.gfp_mask);
/*
* We need to be able to allocate from the reserves for RECLAIM_UNMAP
@@ -7372,6 +7373,7 @@ static int __node_reclaim(struct pglist_
memalloc_noreclaim_restore(noreclaim_flag);
fs_reclaim_release(sc.gfp_mask);
psi_memstall_leave(&pflags);
+ delayacct_freepages_end();
trace_mm_vmscan_node_reclaim_end(sc.nr_reclaimed);
_
Patches currently in -mm which might be from wenyuli@xxxxxxxxxxxxxxx are
delayacct-add-memory-reclaim-delay-in-get_page_from_freelist.patch
