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authorMichal Hocko <mhocko@suse.com>2017-02-22 15:44:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-22 16:41:29 -0800
commit9d998b4f1e39abd69441d29a1ef3250514479267 (patch)
treecee0abd3ba3d05102fd4afb9b233623f2e9adf57 /include
parent30b9aed8cd576964bff71a6c5f022ca30ac4c3b7 (diff)
mm, vmscan: add active list aging tracepoint
Our reclaim process has several tracepoints to tell us more about how things are progressing. We are, however, missing a tracepoint to track active list aging. Introduce mm_vmscan_lru_shrink_active which reports the number of - nr_taken is number of isolated pages from the active list - nr_referenced pages which tells us that we are hitting referenced pages which are deactivated. If this is a large part of the reported nr_deactivated pages then we might be hitting into the active list too early because they might be still part of the working set. This might help to debug performance issues. - nr_active pages which tells us how many pages are kept on the active list - mostly exec file backed pages. A high number can indicate that we might be trashing on executables. [mhocko@suse.com: update] Link: http://lkml.kernel.org/r/20170104135244.GJ25453@dhcp22.suse.cz Link: http://lkml.kernel.org/r/20170104101942.4860-3-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: Minchan Kim <minchan@kernel.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/trace/events/vmscan.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index 39bad8921ca1..c295d8f1b67a 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -363,6 +363,42 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
show_reclaim_flags(__entry->reclaim_flags))
);
+TRACE_EVENT(mm_vmscan_lru_shrink_active,
+
+ TP_PROTO(int nid, unsigned long nr_taken,
+ unsigned long nr_active, unsigned long nr_deactivated,
+ unsigned long nr_referenced, int priority, int file),
+
+ TP_ARGS(nid, nr_taken, nr_active, nr_deactivated, nr_referenced, priority, file),
+
+ TP_STRUCT__entry(
+ __field(int, nid)
+ __field(unsigned long, nr_taken)
+ __field(unsigned long, nr_active)
+ __field(unsigned long, nr_deactivated)
+ __field(unsigned long, nr_referenced)
+ __field(int, priority)
+ __field(int, reclaim_flags)
+ ),
+
+ TP_fast_assign(
+ __entry->nid = nid;
+ __entry->nr_taken = nr_taken;
+ __entry->nr_active = nr_active;
+ __entry->nr_deactivated = nr_deactivated;
+ __entry->nr_referenced = nr_referenced;
+ __entry->priority = priority;
+ __entry->reclaim_flags = trace_shrink_flags(file);
+ ),
+
+ TP_printk("nid=%d nr_taken=%ld nr_active=%ld nr_deactivated=%ld nr_referenced=%ld priority=%d flags=%s",
+ __entry->nid,
+ __entry->nr_taken,
+ __entry->nr_active, __entry->nr_deactivated, __entry->nr_referenced,
+ __entry->priority,
+ show_reclaim_flags(__entry->reclaim_flags))
+);
+
#endif /* _TRACE_VMSCAN_H */
/* This part must be outside protection */