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Thu, 28 Aug 2025 17:21:36 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id wG0oLCCQsGh9VQAAD6G6ig (envelope-from ); Thu, 28 Aug 2025 17:21:36 +0000 Message-ID: Date: Thu, 28 Aug 2025 19:21:36 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 2/2] mm/show_mem: Add trylock while printing alloc info Content-Language: en-US To: Shakeel Butt 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 References: <7e2bc96faab1a338829e549246189ad96e6c866b.1756318426.git.pyyjason@gmail.com> <20250827150619.4e468e68988f224f9f9bea6f@linux-foundation.org> <5ce6yn4iml5tk5zpf73gbxk6z244bkchwuxfpvuervyh2zlqlc@7sanekvjpglm> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Level: X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; MIME_TRACE(0.00)[0:+]; MID_RHS_MATCH_FROM(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[gmail.com,linux-foundation.org,google.com,suse.com,cmpxchg.org,nvidia.com,kvack.org,meta.com,vger.kernel.org]; RCPT_COUNT_TWELVE(0.00)[12]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[] X-Spam-Flag: NO X-Spam-Score: -4.30 On 8/28/25 18:35, Shakeel Butt wrote: > 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? If we only use spin_trylock then it won't.