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[195.135.220.15]) by mx.google.com with ESMTPS id w41si3571135edw.268.2019.06.05.09.37.14 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Jun 2019 09:37:14 -0700 (PDT) Received-SPF: pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 80392AC3F; Wed, 5 Jun 2019 16:37:14 +0000 (UTC) Subject: Re: question: should_compact_retry limit To: Mike Kravetz , "linux-mm@kvack.org" , linux-kernel Cc: Michal Hocko References: <6377c199-2b9e-e30d-a068-c304d8a3f706@oracle.com> <908c1454-6ae5-87ca-c6a5-e542fbafa866@suse.cz> <3bc00340-1e81-4f08-37f8-28388b7fba3b@oracle.com> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <3bc00340-1e81-4f08-37f8-28388b7fba3b@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/5/19 6:05 PM, Mike Kravetz wrote: > On 6/5/19 12:58 AM, Vlastimil Babka wrote: >> On 6/5/19 1:30 AM, Mike Kravetz wrote: >> Hmm I guess we didn't expect compaction_withdrawn() to be so >> consistently returned. Do you know what value of compact_result is there >> in your test? > > Added some instrumentation to record values and ran test, > > 557904 Total > > 549186 COMPACT_DEFERRED Retrying mindlessly with compaction deferred sounds definitely wrong, I'll try to look at it. Thanks. > 8718 COMPACT_PARTIAL_SKIPPED > > Do note that this is not my biggest problem with these allocations. That is > should_continue_reclaim returning true more often that in should. Still > trying to get more info on that. This was just something curious I also > discovered. >