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Thu, 17 Jul 2025 17:29:05 +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 kfd2GOEyeWgRZQAAD6G6ig (envelope-from ); Thu, 17 Jul 2025 17:29:05 +0000 Message-ID: <8c567101-8b6c-41aa-a684-cf05f1d3fcb7@suse.cz> Date: Thu, 17 Jul 2025 19:29:05 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/6] sched/isolation: Introduce isolated task work Content-Language: en-US To: Frederic Weisbecker , LKML Cc: Andrew Morton , Ingo Molnar , Marcelo Tosatti , Michal Hocko , Oleg Nesterov , Peter Zijlstra , Thomas Gleixner , Valentin Schneider , linux-mm@kvack.org References: <20250703140717.25703-1-frederic@kernel.org> <20250703140717.25703-6-frederic@kernel.org> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20250703140717.25703-6-frederic@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2269C80012 X-Stat-Signature: oyy8wekwt313npafkumpsehajqfx4ib1 X-HE-Tag: 1752773347-788326 X-HE-Meta: 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 xE7F3SRo oZtw4Lorv0L/Q4ik98OuVzAAYp1/0kodyWPky3+X9nuRsgqHDBFtTh5jwvONfP02tjQBZWw0prDAGqmpN8Nmij22gZpqWju85xiZXnr9v1o0lp1qxOfNAfMIxXIQiA7quYRvyI8m3gErGP+/vL94DYH7+mNYyT5wcSM884YC23P3Ls4pVLVwFxhBIRoh3p8H93/8xwbkbQNbTbeRzqKLNuxstSAnvD1nIAQEPMusHvXQU2veQ3NSNGL1iGRAuHsFKWVKbalEguwEjIU8/iLKDJti7ukbRslhxiIFAIDLIWmvcxbaUWHgb67luyg== 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 7/3/25 16:07, Frederic Weisbecker wrote: > Some asynchronous kernel work may be pending upon resume to userspace > and execute later on.On isolated workload this becomes problematic once > the process is done with preparatory work involving syscalls and wants > to run in userspace without being interrupted. > > Provide an infrastructure to queue a work to be executed from the current > isolated task context right before resuming to userspace. This goes with > the assumption that isolated tasks are pinned to a single nohz_full CPU. > > Signed-off-by: Frederic Weisbecker I'm wondering if this really needs a new config or we're being unnecessarily defensive and the existing NO_HZ_FULL should be enough?