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([2a09:80c0:192:0:5dac:bf3d:c41:c3e7]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-422f6127d6dsm154993945e9.26.2024.06.17.02.52.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Jun 2024 02:52:21 -0700 (PDT) Message-ID: <87fc95c7-0351-4b05-b68b-9b9364474cae@redhat.com> Date: Mon, 17 Jun 2024 11:52:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/gup: don't check page lru flag before draining it To: yangge1116 , Matthew Wilcox Cc: Baolin Wang , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, liuzixing@hygon.cn References: <0d7a4405-9a2e-4bd1-ba89-a31486155233@redhat.com> <776de760-e817-43b2-bd00-8ce96f4e37a8@redhat.com> <7063920f-963a-4b3e-a3f3-c5cc227bc877@redhat.com> <48150a28-ed48-49ff-9432-9cd30cda4da4@linux.alibaba.com> <11ef3deb-d1e3-46d5-97ed-9ba3c1fbbba9@redhat.com> <697a9bc2-a655-4035-aa5e-7d3acb23e79d@redhat.com> <3a368e38-a4cb-413e-a6d9-41c6b3dbd5ae@redhat.com> <48fb0e58-16d1-7956-cf35-74741826617a@126.com> <617f9e36-9334-4630-a6b9-473f2dd570d4@redhat.com> <8351052a-5c21-c383-544b-3166e883587c@126.com> <7b69abe5-3782-965c-ec82-5baef84e2d06@126.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 64E011C0011 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: iiwkap5amgo6f7e9skj131g151wf4hfj X-HE-Tag: 1718617946-422703 X-HE-Meta: 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 Haq2vF2M HblxeBmBwtEil8dVZoGHqIFRIDs3Figr6TX2LmAvSleMoS8AiCUHfSs0rOyuZevq2spFY/B1QfQr6eYO85FXHfiaSktlp2LKXZyGtUwGQ4iju+4KGODj+7OiDTcf3IesPOl5B+UrwV1In/dAsl9+szK6dMZltcRI7RwzoMgAepfwAcwU2CAQLscG8P3aZrOfxqG+/b6yHRgKeyGFSTOQm/EoZV/kc0sHlRDlTWphtTjC1/drkSL/hui+67CQ4wdQtJeISiq1tsdOqyRwF6Mhn+fA00w/zGpXUGIFsm8Ega5bsHBER/9560d1YJkSjrT/u2KwiBK/nmD/E6VhbGW9NSQul7RvM+YoFcuoEsrPiXQ2828416RYW33k9uc9S4kIju/p1Nc1TVOmX1/RsD6IYhlpv8uqYO+hWWwgrnC9XezeH/OUjMEk/egT66Zgt4QzWEfSiosbM+I+awPg= 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: List-Subscribe: List-Unsubscribe: On 17.06.24 11:50, yangge1116 wrote: > > > 在 2024/6/12 下午3:32, David Hildenbrand 写道: >> On 11.06.24 13:20, yangge1116 wrote: >>> >>> >>> 在 2024/6/9 上午12:03, David Hildenbrand 写道: >>>> On 08.06.24 17:15, Matthew Wilcox wrote: >>>>> On Sat, Jun 08, 2024 at 12:38:49PM +0800, yangge1116 wrote: >>>>>> Can we add a PG_lru_batch flag to determine whether a page is in lru >>>>>> batch? >>>>>> If we can, seems this problem will be easier. >>>>> >>>>> Page flags are in short supply.  You'd need a really good >>>>> justification. >>>>> >>>> >>>> A flag would not be able to handle the "part of multiple LRU batches" >>>> that should currently possible (when to clear the flag?). Well, if we >>>> have to keep supporting that. If we only to be part in a single LRU >>>> batch, a new flag could work and we could still allow isolating a folio >>>> from LRU while in some LRU batch. >>> >>> Yes, before adding a folio to LRU batch, check whether the folio has >>> been added. Add the folio to LRU batch only if the folio has not been >>> added. >>> >>>> >>>> If we could handle it using the existing flags, that would of course be >>>> better (wondering if we could store more information in the existing >>>> flags by using a different encoding for the different states). >>> >>> If a folio contains more than one page, the folio will not be added to >>> LRU batch. Can we use folio_test_large(folio) to filter? >>> >>> if (!folio_test_large(folio) && drain_allow) { >>>     lru_add_drain_all(); >>>     drain_allow = false; >>> } >> >> I think we should do better than this, and not do arbitrary >> lru_add_drain_all() calls. >> > > Thanks, I've got another idea. > > If we add GUP_PIN_COUNTING_BIAS to folio's ref count before adding to > LRU batch, we can use folio_maybe_dma_pinned(folio) to check whether the > folio is in LRU batch. I wonder if it's feasible? Why would we want to make folio_maybe_dma_pinned() detection that worse? -- Cheers, David / dhildenb