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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2013-11-13 03:08:19 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 07:09:10 +0400
commit52c8f6a5aeb0bdd396849ecaa72d96f8175528f5 (patch)
tree396299d23b3bf478770d4030000851ebd29223cf /include/trace
parent5d0f3f72efb1c1968ce1f56c58f9e3e6495effa6 (diff)
downloadlinux-52c8f6a5aeb0bdd396849ecaa72d96f8175528f5.tar.xz
mm: get rid of unnecessary overhead of trace_mm_page_alloc_extfrag()
In general, every tracepoint should be zero overhead if it is disabled. However, trace_mm_page_alloc_extfrag() is one of exception. It evaluate "new_type == start_migratetype" even if tracepoint is disabled. However, the code can be moved into tracepoint's TP_fast_assign() and TP_fast_assign exist exactly such purpose. This patch does it. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Mel Gorman <mgorman@suse.de> 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/kmem.h10
1 files changed, 4 insertions, 6 deletions
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index d0c613476620..aece1346ceb7 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -267,14 +267,12 @@ DEFINE_EVENT_PRINT(mm_page, mm_page_pcpu_drain,
TRACE_EVENT(mm_page_alloc_extfrag,
TP_PROTO(struct page *page,
- int alloc_order, int fallback_order,
- int alloc_migratetype, int fallback_migratetype,
- int change_ownership),
+ int alloc_order, int fallback_order,
+ int alloc_migratetype, int fallback_migratetype, int new_migratetype),
TP_ARGS(page,
alloc_order, fallback_order,
- alloc_migratetype, fallback_migratetype,
- change_ownership),
+ alloc_migratetype, fallback_migratetype, new_migratetype),
TP_STRUCT__entry(
__field( struct page *, page )
@@ -291,7 +289,7 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__entry->fallback_order = fallback_order;
__entry->alloc_migratetype = alloc_migratetype;
__entry->fallback_migratetype = fallback_migratetype;
- __entry->change_ownership = change_ownership;
+ __entry->change_ownership = (new_migratetype == alloc_migratetype);
),
TP_printk("page=%p pfn=%lu alloc_order=%d fallback_order=%d pageblock_order=%d alloc_migratetype=%d fallback_migratetype=%d fragmenting=%d change_ownership=%d",