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mm, vmscan: enhance mm_vmscan_lru_shrink_inactive tracepoint

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mm_vmscan_lru_shrink_inactive will currently report the number of
scanned and reclaimed pages.  This doesn't give us an idea how the
reclaim went except for the overall effectiveness though.  Export and
show other counters which will tell us why we couldn't reclaim some
pages.

	- nr_dirty, nr_writeback, nr_congested and nr_immediate tells
	  us how many pages are blocked due to IO
	- nr_activate tells us how many pages were moved to the active
	  list
	- nr_ref_keep reports how many pages are kept on the LRU due
	  to references (mostly for the file pages which are about to
	  go for another round through the inactive list)
	- nr_unmap_fail - how many pages failed to unmap

All these are rather low level so they might change in future but the
tracepoint is already implementation specific so no tools should be
depending on its stability.

Link: http://lkml.kernel.org/r/20170104101942.4860-7-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: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko
2017-02-22 15:44:30 -08:00
committed by Linus Torvalds
parent 3c710c1ad1
commit 5bccd16657
2 changed files with 40 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
include/trace/events/vmscan.h
View File

@@ -340,14 +340,27 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
TP_PROTO(int nid,
unsigned long nr_scanned, unsigned long nr_reclaimed,
unsigned long nr_dirty, unsigned long nr_writeback,
unsigned long nr_congested, unsigned long nr_immediate,
unsigned long nr_activate, unsigned long nr_ref_keep,
unsigned long nr_unmap_fail,
int priority, int file),
TP_ARGS(nid, nr_scanned, nr_reclaimed, priority, file),
TP_ARGS(nid, nr_scanned, nr_reclaimed, nr_dirty, nr_writeback,
nr_congested, nr_immediate, nr_activate, nr_ref_keep,
nr_unmap_fail, priority, file),
TP_STRUCT__entry(
__field(int, nid)
__field(unsigned long, nr_scanned)
__field(unsigned long, nr_reclaimed)
__field(unsigned long, nr_dirty)
__field(unsigned long, nr_writeback)
__field(unsigned long, nr_congested)
__field(unsigned long, nr_immediate)
__field(unsigned long, nr_activate)
__field(unsigned long, nr_ref_keep)
__field(unsigned long, nr_unmap_fail)
__field(int, priority)
__field(int, reclaim_flags)
),
@@ -356,14 +369,24 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
__entry->nid = nid;
__entry->nr_scanned = nr_scanned;
__entry->nr_reclaimed = nr_reclaimed;
__entry->nr_dirty = nr_dirty;
__entry->nr_writeback = nr_writeback;
__entry->nr_congested = nr_congested;
__entry->nr_immediate = nr_immediate;
__entry->nr_activate = nr_activate;
__entry->nr_ref_keep = nr_ref_keep;
__entry->nr_unmap_fail = nr_unmap_fail;
__entry->priority = priority;
__entry->reclaim_flags = trace_shrink_flags(file);
),
TP_printk("nid=%d nr_scanned=%ld nr_reclaimed=%ld priority=%d flags=%s",
TP_printk("nid=%d nr_scanned=%ld nr_reclaimed=%ld nr_dirty=%ld nr_writeback=%ld nr_congested=%ld nr_immediate=%ld nr_activate=%ld nr_ref_keep=%ld nr_unmap_fail=%ld priority=%d flags=%s",
__entry->nid,
__entry->nr_scanned, __entry->nr_reclaimed,
__entry->priority,
__entry->nr_dirty, __entry->nr_writeback,
__entry->nr_congested, __entry->nr_immediate,
__entry->nr_activate, __entry->nr_ref_keep,
__entry->nr_unmap_fail, __entry->priority,
show_reclaim_flags(__entry->reclaim_flags))
);