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b=twNTuNmPH1sBFyI0ob0L9ArKRS6yehjFEXHz1zKy0LkdNt4eHTq+kwVrQHr+BzUGD Eo8dCT/kB6DIgjjlTSjMi1wIUbjlB7opsoX9yEmmGYknAQxr3ZGeUgGd5TD5H+odbu GHdZ4v8B1BZ47coDPHj8QvHYnf68YcyIcrRg0xr0= Date: Thu, 5 Sep 2024 16:25:24 -0700 From: Andrew Morton To: Yu Zhao Cc: Kent Overstreet , Suren Baghdasaryan , Muchun Song , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH mm-unstable v1 3/3] mm/codetag: add pgalloc_tag_copy() Message-Id: <20240905162524.72c5bbefa075adb466ea6057@linux-foundation.org> In-Reply-To: <20240903213649.3566695-3-yuzhao@google.com> References: <20240903213649.3566695-1-yuzhao@google.com> <20240903213649.3566695-3-yuzhao@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: pq5hdgcdp5r3ty6hp9pyzj9767rh8jcr X-Rspamd-Queue-Id: CF49AA0002 X-Rspamd-Server: rspam02 X-HE-Tag: 1725578725-888643 X-HE-Meta: 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 016JbklP no2Scask6GAHhhCZNU8H6m4gEeRmOjY0GsUdKEuibWLnxynoVwmxQvP6r1xOr1bgrYQs0lsS7bdsFCqQJrHlMDsS1Gy19IbzMmgCn2KIpRGv5j08OmW4OPpMpsymOmz/NCYzdEEWzyBuLFARe3NtvwzgloeTmBaXPy7U6OeGy/pSexbT4XZZWHOlMK9efUlBHSi2nWS3LTuqC7vX+CnuMpOBoec1554QELyQaRtiU8MAhK9bRDmCvB/PvUtzVrKWy9u5Zt4+pKLok88vRZYhvKM6r/bptm4i2dUGeZa7QzPxZPXSwf4cG1IGSV4g8hvpQLvOJz7M0E8+oZU8lL+NpdOnufw== 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 Tue, 3 Sep 2024 15:36:49 -0600 Yu Zhao wrote: > Add pgalloc_tag_copy() to transfer the codetag from the old folio to > the new one during migration. This makes original allocation sites > persist cross migration rather than lump into compaction_alloc, e.g., > # echo 1 >/proc/sys/vm/compact_memory > # grep compaction_alloc /proc/allocinfo > > Before this patch: > 132968448 32463 mm/compaction.c:1880 func:compaction_alloc > > After this patch: > 0 0 mm/compaction.c:1880 func:compaction_alloc > I'm thinking that [2/3] should be backported? And possibly this one, but for that we should identify a Fixes:, please.