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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>
This commit is contained in:
KOSAKI Motohiro 2013-11-12 15:08:19 -08:00 committed by syphyr
parent d2b37143d9
commit c865a91570
2 changed files with 6 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/trace/events/kmem.h
View File

@ -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",

5
mm/page_alloc.c
View File

@ -1192,9 +1192,8 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
*/
set_freepage_migratetype(page, new_type);
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;
}