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Wed, 07 Jul 2021 14:14:33 -0700 (PDT) MIME-Version: 1.0 References: <20210623192822.3072029-1-surenb@google.com> <20210702152724.7fv5tnik4qlap6do@wittgenstein> In-Reply-To: From: Suren Baghdasaryan Date: Wed, 7 Jul 2021 14:14:23 -0700 Message-ID: Subject: Re: [PATCH 1/1] mm: introduce process_reap system call To: Michal Hocko Cc: David Hildenbrand , Christian Brauner , Andy Lutomirski , Johannes Weiner , Andrew Morton , David Rientjes , Matthew Wilcox , Roman Gushchin , Rik van Riel , Minchan Kim , Christian Brauner , Christoph Hellwig , Oleg Nesterov , Jann Horn , Shakeel Butt , Tim Murray , Linux API , Linux-MM , LKML , Android Kernel Team Content-Type: text/plain; charset="UTF-8" X-Rspam-User: nil Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=JYYnHEW7; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf22.hostedemail.com: domain of surenb@google.com designates 209.85.219.175 as permitted sender) smtp.mailfrom=surenb@google.com X-Stat-Signature: y3m8rp5ktderxcqybaaucexsgubxf3ff X-Rspamd-Queue-Id: B53F01986 X-Rspamd-Server: rspam01 X-HE-Tag: 1625692474-520819 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, Jul 7, 2021 at 5:38 AM Michal Hocko wrote: > > On Mon 05-07-21 09:41:54, David Hildenbrand wrote: > > On 02.07.21 17:27, Christian Brauner wrote: > [...] > > > That one was my favorite from the list I gave too but maybe we can > > > satisfy Andy too if we use one of: > > > - process_mfree() > > > - process_mrelease() > > > > > > > FWIW, I tend to like process_mrelease(), due to the implied "release" ("free > > the memory if there are no other references") semantics. > > Agreed. Ok, sounds like process_mrelease() would be an acceptable compromise. > > > Further, a new > > syscall feels cleaner than some magic sysfs/procfs toggle. Just my 2 cents. > > Yeah, proc based interface is both tricky to use and kinda ugly now that > pidfd can solve all at in once. Sounds good. Will keep it as is then. > My original preference was a more generic kill syscall to allow flags > but a dedicated syscall doesn't look really bad either. Yeah, I have tried that direction unsuccessfully before arriving at this one. Hopefully it represents the right compromise which can satisfy everyone's usecase. > -- > Michal Hocko > SUSE Labs