linux-kernel - Re: [PATCH 2/3] mm/page_isolation: add new tracepoint, test_pages

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Date:	Fri, 20 Nov 2015 15:21:52 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Nazarewicz <mina86@...a86.com>,
	Minchan Kim <minchan@...nel.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 2/3] mm/page_isolation: add new tracepoint,
 test_pages_isolated

On Thu, Nov 19, 2015 at 03:34:11PM -0800, Andrew Morton wrote:
> On Fri, 13 Nov 2015 11:23:47 +0900 Joonsoo Kim <js1304@...il.com> wrote:
> 
> > cma allocation should be guranteeded to succeed, but, sometimes,
> > it could be failed in current implementation. To track down
> > the problem, we need to know which page is problematic and
> > this new tracepoint will report it.
> 
> akpm3:/usr/src/25> size mm/page_isolation.o
>    text    data     bss     dec     hex filename
>    2972     112    1096    4180    1054 mm/page_isolation.o-before
>    4608     570    1840    7018    1b6a mm/page_isolation.o-after
> 
> This seems an excessive amount of bloat for one little tracepoint.  Is
> this expected and normal (and acceptable)?

Hello,

I checked bloat on other tracepoints and found that it's normal.
It takes 1KB more per tracepoint.

Thanks.
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