linux-kernel - Re: [PATCH] mm: get rid of unnecessary overhead of trace_mm_page_alloc

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Message-ID: <20131030152057.GP2400@suse.de>
Date:	Wed, 30 Oct 2013 15:20:57 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	kosaki.motohiro@...il.com
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH] mm: get rid of unnecessary overhead of
 trace_mm_page_alloc_extfrag()

On Fri, Oct 25, 2013 at 12:42:47PM -0400, kosaki.motohiro@...il.com wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> 
> 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.
> 
> Cc: Mel Gorman <mgorman@...e.de>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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