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ESMTP id S1752359AbeCZPih (ORCPT ); Mon, 26 Mar 2018 11:38:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=virtuozzo.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=kLGXdPOg6f2L7FHITDdFeMxH72r/TpUgKaEN02VX18c=; b=IXcq1cCYmAlL4eRu9d6FtyCBsyma9355h94XfjzQrak4JNHs3pGODkuHaJxZxiARak4rWfBhbk6pwdLki1kTVSUC8BYsgO/ZVepjPUbmfIrONKJsRIKCf/2PM9/ybblwhxzqC96QYIKF5eje55025JjPjSCZI4Tha89enZbgrwM= Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=ktkhai@virtuozzo.com; Received: from [172.16.25.196] (195.214.232.6) by VI1PR0801MB1343.eurprd08.prod.outlook.com (2603:10a6:800:3b::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.20.609.10; Mon, 26 Mar 2018 15:38:32 +0000 Subject: Re: [PATCH 01/10] mm: Assign id to every memcg-aware shrinker To: Matthew Wilcox Cc: Vladimir Davydov , viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org, akpm@linux-foundation.org, tglx@linutronix.de, pombredanne@nexb.com, stummala@codeaurora.org, gregkh@linuxfoundation.org, sfr@canb.auug.org.au, guro@fb.com, mka@chromium.org, penguin-kernel@I-love.SAKURA.ne.jp, chris@chris-wilson.co.uk, longman@redhat.com, minchan@kernel.org, hillf.zj@alibaba-inc.com, ying.huang@intel.com, mgorman@techsingularity.net, shakeelb@google.com, jbacik@fb.com, linux@roeck-us.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <152163840790.21546.980703278415599202.stgit@localhost.localdomain> <152163847740.21546.16821490541519326725.stgit@localhost.localdomain> <20180324184009.dyjlt4rj4b6y6sz3@esperanza> <0db2d93f-12cd-d703-fce7-4c3b8df5bc12@virtuozzo.com> <20180326151406.GE10912@bombadil.infradead.org> From: Kirill Tkhai Message-ID: Date: Mon, 26 Mar 2018 18:38:29 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180326151406.GE10912@bombadil.infradead.org> Content-Type: text/plain; charset=utf-8 Content-Language: 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1;VI1PR0801MB1343;7:iUKulsbcegTuo4k4/vs0qL1sKgqQXpNXSlUng2uTD5KJGeIm8KD8dPYWs1R5tryfoDtULt6IUult6RKSS6wwrzRU8/XWo0bWJnFtis/dIPZdZv0yYrkVK81vSC6y0DzBrm7O7faCCtwHhGjalO7kY3T2BcVHSj+9/Rqp3pfl0zNAiNAa5sUXmdKmwzMysq18O92QX9ABvl/Dfg9zvsrT0xHD3oYYobh3sDNYvb7mLTz+no7ne/ygrQ+XrB8vccC/;20:QBzsWBdcYQbp+rq68jVvA3bY4GPg0+EynY7K255KB6rTS+C6xk9T30LMdpFl50/MnD//6UfbfGEQ44EXfUIrbRPEmCghYZpjVDrOnOXVFjeu9iu3/HYAShetLROONhhr+x+1sQp2V7kAJ0L5OIhAIs3Mg7dHCaVwti2YCMaWOU4= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Mar 2018 15:38:32.5498 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a4ed713-ee49-4bd3-49bf-08d5932fa2ba X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR0801MB1343 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 26.03.2018 18:14, Matthew Wilcox wrote: > On Mon, Mar 26, 2018 at 06:09:35PM +0300, Kirill Tkhai wrote: >>> AFAIK ida always allocates the smallest available id so you don't need >>> to keep track of bitmap_id_start. >> >> I saw mnt_alloc_group_id() does the same, so this was the reason, the additional >> variable was used. Doesn't this gives a good advise to ida and makes it find >> a free id faster? > > No, it doesn't help the IDA in the slightest. I have a patch in my > tree to delete that silliness from mnt_alloc_group_id(); just haven't > submitted it yet. Ok, then I'll remove this trick. Thanks, Kirill