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[109.81.81.105]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9e564e96a9sm150993266b.97.2024.11.01.00.35.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Nov 2024 00:35:27 -0700 (PDT) Date: Fri, 1 Nov 2024 08:35:26 +0100 From: Michal Hocko To: Stepanov Anatoly Cc: Gutierrez Asier , akpm@linux-foundation.org, david@redhat.com, ryan.roberts@arm.com, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, hannes@cmpxchg.org, hocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, alexander.kozhevnikov@huawei-partners.com, guohanjun@huawei.com, weiyongjun1@huawei.com, wangkefeng.wang@huawei.com, judy.chenhui@huawei.com, yusongping@huawei.com, artem.kuzin@huawei.com, kang.sun@huawei.com, nikita.panov@huawei-partners.com Subject: Re: [RFC PATCH 0/3] Cgroup-based THP control Message-ID: References: <20241030083311.965933-1-gutierrez.asier@huawei-partners.com> <770bf300-1dbb-42fc-8958-b9307486178e@huawei-partners.com> <80d76bad-41d8-4108-ad74-f891e5180e47@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <80d76bad-41d8-4108-ad74-f891e5180e47@huawei.com> X-Rspamd-Queue-Id: 86535140017 X-Stat-Signature: 1f4f3sifnnu7kctt59pcbj4hdyuyhjmf X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1730446511-969743 X-HE-Meta: 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 txGiOO4x itKCzE37QaMkDAsGYWqO5dc72L6gfe7ECjLcrQR75+w9TsEaFWx2LpNpu5UBJizziqEEkvrojh4BTdtjv8GF4c00x7mIfEGAq+a9tXO/dJU9ANKwyPMy91dthLmq7KLBIFgwFZI5Ifgn4yNgXjo568VaILwS7hpj2nBVyAYhTFdnvJsXM5pADvre+zOZegPqxRxHORUSb2ESA3zsDCcn5AuKW3xIcq8y3AM98pLQiKwMRs2wpUe8dl0KcJTc7U11EEQcu5lC8OEGFXX0hxYf9ShbpgvZS+b8xwF78pT9Wfq0lOIAkO6aCEooV2w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, 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 Thu 31-10-24 17:37:12, Stepanov Anatoly wrote: > If we consider the inheritance approach (prctl + launcher), it's fine until we need to change > THP mode property for several tasks at once, in this case some batch-change approach needed. I do not follow. How is this any different from a single process? Or do you mean to change the mode for an already running process? > if, for example, process_madvise() would support task recursive logic, coupled with kind of > MADV_HUGE + *ITERATE_ALL_VMA*, it would be helpful. > In this case, the orchestration will be much easier. Nope, process_madvise is pidfd based interface and making it recursive seems simply impossible for most operations as the address space is very likely different in each child process. -- Michal Hocko SUSE Labs