[PATCH RFC] delayacct: add memory reclaim delay in get_page_from_freelist

["liwenyu01@bilibili.com" <liwenyu01@bilibili.com>]

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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().

Signed-off-by: Wen Yu Li <liwenyu01@bilibili.com>
---
mm/vmscan.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1080209a568b..d2471abce1ae 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -8010,6 +8010,7 @@ 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
@@ -8032,6 +8033,7 @@ 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);

--
2.30.2


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