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authorYafang Shao <laoar.shao@gmail.com>2019-05-13 17:17:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-14 09:47:46 -0700
commit132bb8cfc9e081238e7e2fd0c37c8c75ad0d2963 (patch)
treeb09c82741dd92664b8816acf73978dbe67c9f6d3 /mm/vmscan.c
parent5e65af19e89ac33dc83e1869c78b33ed7099469b (diff)
mm/vmscan: add tracepoints for node reclaim
The page alloc fast path it may perform node reclaim, which may cause a latency spike. We should add tracepoint for this event, and also measure the latency it causes. So bellow two tracepoints are introduced, mm_vmscan_node_reclaim_begin mm_vmscan_node_reclaim_end Link: http://lkml.kernel.org/r/1551421452-5385-1-git-send-email-laoar.shao@gmail.com Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Souptick Joarder <jrdr.linux@gmail.com> Cc: <shaoyafang@didiglobal.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 40ff747e0b33..39912c6b7181 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4111,6 +4111,9 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
.reclaim_idx = gfp_zone(gfp_mask),
};
+ trace_mm_vmscan_node_reclaim_begin(pgdat->node_id, order,
+ sc.gfp_mask);
+
cond_resched();
fs_reclaim_acquire(sc.gfp_mask);
/*
@@ -4137,6 +4140,9 @@ static int __node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned in
current->flags &= ~PF_SWAPWRITE;
memalloc_noreclaim_restore(noreclaim_flag);
fs_reclaim_release(sc.gfp_mask);
+
+ trace_mm_vmscan_node_reclaim_end(sc.nr_reclaimed);
+
return sc.nr_reclaimed >= nr_pages;
}