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authorDavid Rientjes <rientjes@google.com>2018-04-06 02:25:16 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-06 07:36:27 +0300
commit5ecd9d403ad081ed2de7b118c1e96124d4e0ba6c (patch)
treed830e17c2cd45583a5c0bd593586145fdc6d6796 /include/trace
parent3eda69c92d4751977baf2d34e88a29d4b6affa7d (diff)
downloadlinux-5ecd9d403ad081ed2de7b118c1e96124d4e0ba6c.tar.xz
mm, page_alloc: wakeup kcompactd even if kswapd cannot free more memory
Kswapd will not wakeup if per-zone watermarks are not failing or if too many previous attempts at background reclaim have failed. This can be true if there is a lot of free memory available. For high- order allocations, kswapd is responsible for waking up kcompactd for background compaction. If the zone is not below its watermarks or reclaim has recently failed (lots of free memory, nothing left to reclaim), kcompactd does not get woken up. When __GFP_DIRECT_RECLAIM is not allowed, allow kcompactd to still be woken up even if kswapd will not reclaim. This allows high-order allocations, such as thp, to still trigger background compaction even when the zone has an abundance of free memory. Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1803111659420.209721@chino.kir.corp.google.com Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> 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.h17
1 files changed, 10 insertions, 7 deletions
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index e0b8b9173e1c..6570c5b45ba1 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -78,26 +78,29 @@ TRACE_EVENT(mm_vmscan_kswapd_wake,
TRACE_EVENT(mm_vmscan_wakeup_kswapd,
- TP_PROTO(int nid, int zid, int order),
+ TP_PROTO(int nid, int zid, int order, gfp_t gfp_flags),
- TP_ARGS(nid, zid, order),
+ TP_ARGS(nid, zid, order, gfp_flags),
TP_STRUCT__entry(
- __field( int, nid )
- __field( int, zid )
- __field( int, order )
+ __field( int, nid )
+ __field( int, zid )
+ __field( int, order )
+ __field( gfp_t, gfp_flags )
),
TP_fast_assign(
__entry->nid = nid;
__entry->zid = zid;
__entry->order = order;
+ __entry->gfp_flags = gfp_flags;
),
- TP_printk("nid=%d zid=%d order=%d",
+ TP_printk("nid=%d zid=%d order=%d gfp_flags=%s",
__entry->nid,
__entry->zid,
- __entry->order)
+ __entry->order,
+ show_gfp_flags(__entry->gfp_flags))
);
DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_begin_template,