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

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Message-Id: <20151119153411.6215be690f75f70b3fa84766@linux-foundation.org>
Date:	Thu, 19 Nov 2015 15:34:11 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joonsoo Kim <js1304@...il.com>
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, Joonsoo Kim <iamjoonsoo.kim@....com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 2/3] mm/page_isolation: add new tracepoint,
 test_pages_isolated

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)?


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