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Wed, 10 Sep 2025 08:40:48 -0700 (PDT) MIME-Version: 1.0 References: <20250909065349.574894-1-liulei.rjpt@vivo.com> In-Reply-To: From: Chris Li Date: Wed, 10 Sep 2025 08:40:36 -0700 X-Gmail-Original-Message-ID: X-Gm-Features: AS18NWAa_U7BDSFPnyN8FeQb4fRXFRsmriu4wTPjiduKLAM37lIhjuNUw2KPbFA Message-ID: Subject: Re: [PATCH v0 0/2] mm: swap: Gather swap entries and batch async release To: Suren Baghdasaryan Cc: Shakeel Butt , Lei Liu , Michal Hocko , David Rientjes , Andrew Morton , Kemeng Shi , Kairui Song , Nhat Pham , Baoquan He , Barry Song , Johannes Weiner , Roman Gushchin , Muchun Song , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Brendan Jackman , Zi Yan , "Peter Zijlstra (Intel)" , Chen Yu , Hao Jia , "Kirill A. Shutemov" , Usama Arif , Oleg Nesterov , Christian Brauner , Mateusz Guzik , Steven Rostedt , Andrii Nakryiko , Al Viro , Fushuai Wang , "open list:MEMORY MANAGEMENT - OOM KILLER" , open list , "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: o79ayxa3ibr3ixzmacsxqrim1eh56f6r X-Rspamd-Queue-Id: 7EAD2160004 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1757518851-49530 X-HE-Meta: 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 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, Sep 9, 2025 at 12:48=E2=80=AFPM Suren Baghdasaryan wrote: > > > Exiting processes compete for CPU cycles, delaying the camera preview > > > thread and causing visible stuttering - directly impacting user > > > experience. > > > > Since the exit/kill is due to low memory situation, punting the memory > > freeing to a low priority async mechanism will help in improving user > > experience. Most probably the application (camera preview here) will ge= t > > into global reclaim and will compete for CPU with the async memory > > freeing. > > > > What we really need is faster memory freeing and we should explore all > > possible ways. As others suggested fix/improve the bottleneck in the > > memory freeing path. In addition I think we should explore parallelizin= g > > this as well. > > > > On Android, I suppose most of the memory is associated with single or > > small set of processes and parallelizing memory freeing would be > > challenging. BTW is LMKD using process_mrelease() to release the killed > > process memory? > > Yes, LMKD has a reaper thread which wakes up and calls > process_mrelease() after the main LMKD thread issued SIGKILL. I feel this is a better solution to address the exit process that is too sl= ow. We are basically optimizing the exit() system call, I feel there should be something we can do in the userspace before exit() to help us without the kernel putting too much complexity into exit(). process_mrelease() souds fit the bill pretty well. Chris