mm: get rid of unnecessary overhead of trace_mm_page_alloc_extfrag()
authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Tue, 12 Nov 2013 23:08:19 +0000 (15:08 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 13 Nov 2013 03:09:10 +0000 (12:09 +0900)
commit52c8f6a5aeb0bdd396849ecaa72d96f8175528f5
tree396299d23b3bf478770d4030000851ebd29223cf
parent5d0f3f72efb1c1968ce1f56c58f9e3e6495effa6
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>
include/trace/events/kmem.h
mm/page_alloc.c