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mm: get rid of unnecessary overhead of trace_mm_page_alloc_extfrag()

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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>
This commit is contained in:
KOSAKI Motohiro
2013-11-12 15:08:19 -08:00
committed by Linus Torvalds
parent 5d0f3f72ef
commit 52c8f6a5ae
2 changed files with 6 additions and 9 deletions
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5
mm/page_alloc.c
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@@ -1103,9 +1103,8 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
is_migrate_cma(migratetype)
? migratetype : start_migratetype);
trace_mm_page_alloc_extfrag(page, order,
current_order, start_migratetype, migratetype,
new_type == start_migratetype);
trace_mm_page_alloc_extfrag(page, order, current_order,
start_migratetype, migratetype, new_type);
return page;
}