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From: Shakeel Butt To: Vlastimil Babka Cc: Yueyang Pan , Andrew Morton , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Usama Arif , linux-mm@kvack.org, kernel-team@meta.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v1 2/2] mm/show_mem: Add trylock while printing alloc info Message-ID: <5ce6yn4iml5tk5zpf73gbxk6z244bkchwuxfpvuervyh2zlqlc@7sanekvjpglm> References: <7e2bc96faab1a338829e549246189ad96e6c866b.1756318426.git.pyyjason@gmail.com> <20250827150619.4e468e68988f224f9f9bea6f@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1D2A640009 X-Stat-Signature: n4wpdufp7z8sjq898dd1qjrecd9b7zyq X-Rspam-User: X-HE-Tag: 1756398945-684711 X-HE-Meta: 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 GmGYdEIj siJAi02LUDQfCKw+MpUxCAda4JXdTJHeBpZHkiE/wbhEHj/HXvwefz6hz4WmKSpklpJ6hnQXV2iNBR6qxBIRQcChUT+2PMeMUrld0tUVIIjinPoZ4jS2HM+yk4HZqmXG51imQCsDonZobLBi1IU9UdUecWD7BbpoTB0VjRWd1FqHsbY5K7GC5/hYdERtG8alLL3FUq81Pzyrcew030FMEmhg7ghHnCn7aeaLoiVLdhiu331gN6Ebf6Kv7ECo+63f8ZaQx 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 Thu, Aug 28, 2025 at 10:41:23AM +0200, Vlastimil Babka wrote: > > > > I was not aware of interrupt context before. I will change to test-and-set > > lock in the next version. > > Perhaps simply spinlock_t with spin_trylock()? > Will lockdep complain that this spinlock is taken in non-irq and irq context without disabling irqs?