From 76a0fb4fd5c940fe4977f2fbdb08167fa16e32f6 Mon Sep 17 00:00:00 2001 From: liwenyu Date: Wed, 20 Sep 2023 17:38:49 +0800 Subject: delayacct: add memory reclaim delay in get_page_from_freelist 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@ex.bilibili.com Signed-off-by: Wen Yu Li Cc: Balbir Singh Cc: Signed-off-by: Andrew Morton --- mm/vmscan.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'mm/vmscan.c') diff --git a/mm/vmscan.c b/mm/vmscan.c index 3df0e2a59052..55424215f759 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -7326,6 +7326,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in 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 @@ -7348,6 +7349,7 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in 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); -- cgit v1.2.3