linux-kernel - Re: [PATCH 0/3] mm: cma: /proc/cmainfo

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Date:	Thu, 22 Jan 2015 18:44:06 +0300
From:	Stefan Strogin <s.strogin@...tner.samsung.com>
To:	Pavel Machek <pavel@....cz>, Minchan Kim <minchan@...nel.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	aneesh.kumar@...ux.vnet.ibm.com,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>,
	Pintu Kumar <pintu.k@...sung.com>,
	Weijie Yang <weijie.yang@...sung.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	SeongJae Park <sj38.park@...il.com>,
	Hui Zhu <zhuhui@...omi.com>,
	Dyasly Sergey <s.dyasly@...sung.com>,
	Vyacheslav Tyrtov <v.tyrtov@...sung.com>,
	s.strogin@...tner.samsung.com
Subject: Re: [PATCH 0/3] mm: cma: /proc/cmainfo

Hello Pavel,

On 02/01/15 08:11, Pavel Machek wrote:
> On Mon 2014-12-29 11:36:39, Minchan Kim wrote:
>> Hello,
>>
>> On Fri, Dec 26, 2014 at 05:39:01PM +0300, Stefan I. Strogin wrote:
>>> Hello all,
>>>
>>> Here is a patch set that adds /proc/cmainfo.
>>>
>>> When compiled with CONFIG_CMA_DEBUG /proc/cmainfo will contain information
>>> about about total, used, maximum free contiguous chunk and all currently
>>> allocated contiguous buffers in CMA regions. The information about allocated
>>> CMA buffers includes pid, comm, allocation latency and stacktrace at the
>>> moment of allocation.
> We should not add new non-process related files in
> /proc. So... NAK. Should this go to debugfs instead?

As you say, I'll move it to debugfs and also split it by CMA region.
Something like: /sys/kernel/debug/cma/*/allocated
Thanks.

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