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Wed, 5 Mar 2025 15:35:07 +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 gArqNitvyGdVagAAD6G6ig (envelope-from ); Wed, 05 Mar 2025 15:35:07 +0000 Message-ID: Date: Wed, 5 Mar 2025 16:35:07 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm, percpu: do not consider sleepable allocations atomic Content-Language: en-US To: Michal Hocko Cc: Dennis Zhou , Tejun Heo , Filipe Manana , Andrew Morton , linux-mm@kvack.org, LKML References: <20250206122633.167896-1-mhocko@kernel.org> From: Vlastimil Babka In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: bxfdsqwhog5yfd3fiu6x6ssqxrr9g19w X-Rspamd-Queue-Id: C3621180009 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1741188909-359483 X-HE-Meta: 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 VPQyo/Bd T5bDlFyj6xEbzknEqShDJcqLrHLzsKK1SG0oLmXAMy7stCn4700r7moZ+NT2wCbidHwY+QT1MdnuweEDq6bULiIiFuB2aLTwa8zFcqnXlm5tMw5mjKP6xeFCvM+tnOBKACx6zvq2CX+6PvkED6ZDBnitn402S1vrfCSE2IG1acwiyfmq6oDwTCPwQk6l5h5zXH8s5AUW0lnR35oHupkDr73nLy+z+3SAYKGiWajXqU1GGtyLAWOms9K5FvZJc6WiVxUlHtO0ZpjTVETRAxOMkhhcAqC2VYvlxmIeG X-Bogosity: Ham, tests=bogofilter, spamicity=0.035049, 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 3/5/25 16:10, Michal Hocko wrote: > Sorry, I have missed follow ups here. > >> I assume it's probably not easy to >> implement as page table allocations are involved in the process and we don't >> have a way to supply preallocated memory for those. > > Why would this be a concern if the allocation is done outside of the > lock? It's not a concern if it can be done outside of the lock. I don't know the code enough to see if it's feasible. There's e.g. pcpu_populate_chunk() ending up doing vmap_pages_range_noflush() that AFAIK means page table allocations. Can it be done outside of the lock?