Message-id: <54E241B7.1070709@partner.samsung.com>
Date: Mon, 16 Feb 2015 22:15:03 +0300
From: Stefan Strogin <s.strogin@partner.samsung.com>
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To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Michal Nazarewicz <mina86@mina86.com>, aneesh.kumar@linux.vnet.ibm.com,
        Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
        Dmitry Safonov <d.safonov@partner.samsung.com>,
        Pintu Kumar <pintu.k@samsung.com>,
        Weijie Yang <weijie.yang@samsung.com>,
        Laura Abbott <lauraa@codeaurora.org>,
        SeongJae Park <sj38.park@gmail.com>, Hui Zhu <zhuhui@xiaomi.com>,
        Minchan Kim <minchan@kernel.org>, Dyasly Sergey <s.dyasly@samsung.com>,
        Vyacheslav Tyrtov <v.tyrtov@samsung.com>, gregory.0xf0@gmail.com,
        sasha.levin@oracle.com, gioh.kim@lge.com, pavel@ucw.cz,
        stefan.strogin@gmail.com
Subject: Re: [PATCH 1/4] mm: cma: add currently allocated CMA buffers list to
 debugfs
References: <cover.1423777850.git.s.strogin@partner.samsung.com>
 <c4f408198ec7ea7656ae29220c1f96081bd2ade5.1423777850.git.s.strogin@partner.samsung.com>
 <20150213031012.GH6592@js1304-P5Q-DELUXE>
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Hello,

On 13/02/15 06:10, Joonsoo Kim wrote:
> On Fri, Feb 13, 2015 at 01:15:41AM +0300, Stefan Strogin wrote:
> 
> This linear searching make cma_release() slow if we have many allocated
> cma buffers. It wouldn't cause any problem?
> 
> Thanks.
> 
> 

On my board the usual number of CMA buffers is about 20, and releasing a
buffer isn't a very frequent operation.
But if there could be systems with much more CMA buffers and/or frequent
allocating/releasing them, maybe it would be useful to convert buffers
list to rb_trees?
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