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| author | Yafang Shao <laoar.shao@gmail.com> | 2019-05-14 03:17:53 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-05-14 19:47:46 +0300 |
| commit | 132bb8cfc9e081238e7e2fd0c37c8c75ad0d2963 (patch) | |
| tree | b09c82741dd92664b8816acf73978dbe67c9f6d3 /include/trace | |
| parent | 5e65af19e89ac33dc83e1869c78b33ed7099469b (diff) | |
| download | linux-132bb8cfc9e081238e7e2fd0c37c8c75ad0d2963.tar.xz | |
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 'include/trace')
| -rw-r--r-- | include/trace/events/vmscan.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index cb2add69301a..b8b9d42944f9 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -469,6 +469,38 @@ TRACE_EVENT(mm_vmscan_inactive_list_is_low, __entry->ratio, show_reclaim_flags(__entry->reclaim_flags)) ); + +TRACE_EVENT(mm_vmscan_node_reclaim_begin, + + TP_PROTO(int nid, int order, gfp_t gfp_flags), + + TP_ARGS(nid, order, gfp_flags), + + TP_STRUCT__entry( + __field(int, nid) + __field(int, order) + __field(gfp_t, gfp_flags) + ), + + TP_fast_assign( + __entry->nid = nid; + __entry->order = order; + __entry->gfp_flags = gfp_flags; + ), + + TP_printk("nid=%d order=%d gfp_flags=%s", + __entry->nid, + __entry->order, + show_gfp_flags(__entry->gfp_flags)) +); + +DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_node_reclaim_end, + + TP_PROTO(unsigned long nr_reclaimed), + + TP_ARGS(nr_reclaimed) +); + #endif /* _TRACE_VMSCAN_H */ /* This part must be outside protection */ |