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Wed, 18 Jan 2023 09:15:37 -0800 (PST) Received: from google.com ([2620:15c:211:201:68ba:bd93:858:15d5]) by smtp.gmail.com with ESMTPSA id l5-20020a170902d34500b001929568afe9sm23268757plk.306.2023.01.18.09.15.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jan 2023 09:15:36 -0800 (PST) Date: Wed, 18 Jan 2023 09:15:34 -0800 From: Minchan Kim To: Michal Hocko Cc: Andrew Morton , Suren Baghdasaryan , Matthew Wilcox , linux-mm , LKML , SeongJae Park Subject: Re: [PATCH 3/3] mm: add vmstat statistics for madvise_[cold|pageout] Message-ID: References: <20230117231632.2734737-1-minchan@kernel.org> <20230117231632.2734737-3-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 4BB521C001F X-Rspam-User: X-Stat-Signature: nbxktm5fck3ubf445qkir9s319537eym X-HE-Tag: 1674062138-184132 X-HE-Meta: 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 qZlHkax9 fyLYXfM9U4lJZa3KHVfp10C7tgHy8Pzw7HsWXEC10MQJPrI5ukcpFhXJKNS+X+f+KvDquo6SF3cufe7sviTG+8EAwNFHJHRMVrhgDJiWonEDUakq51J5CnJs6UYYGZKRDPngPMHaE31fexzVYt4ptccy2fW1RZFaAyOIdVwpex4tGm3Z4Ry9Mz29MWSDziMQUrg01/mAbizwYQ6TOJG+a6zSsQ4C0Qr6VrNZn83NOVHpUl4j61ahAqB9jp8a41oC9DCxItplAmmJejvDaVsOy/QtjMU/6TrfsJ0TovmYpcltIadobM1RYC2wQp7ya9B3sHQUApYQcUx4ECl1K23ZU+f+/8fc3VRwGSP0S 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 Wed, Jan 18, 2023 at 10:11:46AM +0100, Michal Hocko wrote: > On Tue 17-01-23 15:16:32, Minchan Kim wrote: > > madvise LRU manipulation APIs need to scan address ranges to find > > present pages at page table and provides advice hints for them. > > > > Likewise pg[scan/steal] count on vmstat, madvise_pg[scanned/hinted] > > shows the proactive reclaim efficiency so this patch addes those > > two statistics in vmstat. > > Please describe the usecase for those new counters. I wanted to know the proactive reclaim efficieny using MADV_COLD/MDDV_PAGEOUT. Userspace has several policy which when/which vmas need to be hinted by the call and they are evolving. I needed to know how effectively their policy works since the vma ranges are huge(i.e., nr_hinted/nr_scanned).