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Howlett" , Mike Rapoport , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2 4/4] mm: page_alloc: fix non-movable reclaim storm in defrag_mode Message-Id: <20260723170029.0c076f1fca7677fbf156eaa4@linux-foundation.org> In-Reply-To: <67e1219e-9d47-4a30-a8dd-fdcf03229f58@kernel.org> References: <20260722150006.3848560-1-hannes@cmpxchg.org> <20260722150006.3848560-5-hannes@cmpxchg.org> <20260722162207.31a2c491ffaf36d1e8948c14@linux-foundation.org> <67e1219e-9d47-4a30-a8dd-fdcf03229f58@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 1A987C000F X-Stat-Signature: f93jgpiuq6epwn4m8cqyt1derd3r7cne X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1784851230-788226 X-HE-Meta: U2FsdGVkX19O4Ft5ZOIRLQoRHaL44pEtOYsHQUCEUouG8HtVVGu228ME+1NGMZg13lSKL+DDY+sbdM+nBDJy6unXd10BDlDU1rwfo5+4qJQzyj7EuS3mXx9NCOZ6NbiNTpVGRWv+ix2gAG6YzpfJRSy4Lzen2Q0z04vB6tf2fCskXn+p/LIVoE9KlZ6lEC3uz5jKS8oJP91BqnXNUGBtA6dCHPN/8VKrlpN84ahcf0eftxQqBeMLKQvIiq4LUjKcJYrkRcgVqDyUH1lECZoO03TnW4eLB6orpXO9Tlrv9eC6KF0vnh+FAArGSpd3wWz26gPdUSWxyyjYFVd+DRLKaSETivQTLDQzmXLKm//KgrTQG1V9YtiCPaUToefaU27fnlsfrbCDQNsdDYt6lr10dZoQkYu0UjW0rUOteDlcabUDsThjxKV8Ai3nTApt2jKx8o0KGv44Xg9qnnkfd3Sy3epE09jhGDe2292/q1FEqBsBM/iJkw7+cHYLany7aD1oTwyi3Kqwek4JITZZgdOqcFsNTn/IGLtVhKovnVFsy7q+ex68nhFEggsWsKcsirIzCRTyzSf7oqB3ERNqMSgyng/Es9pcRgYStNa2tiozxs7IzRbAbheYdttok4WfeekxODfxshFwCSHM/HqRPFtYWf0ufj/je4ItGS2QBJauRSsJ8HQBctH2J8zf/Ec62/RyMqK51Xyx6zPmWRSur3VHPIyYnHWYYMUErrMGNtFZdaKpFR220Yme6FKMP1Ee9oYLbCM3ZmjG0fET86NcPzEJtuG1UONwYndO738L+10GEkejDJLWzoAWic+4GTuKruKAsQZYyLbhwFLzbmkHdD73TbAwzRhs39JP9copDTuFd3zEnb0M17NHhiPesdoY3sS4K2a8fXUkEiHyq+oPgixB49keToS4O0qi3vHwetBwYY93JXTS3bpEhuoAXC1cps8Bqpqo3GEx9AZaRfqRHes S9OqA7qz Ylb/lCwsael+j3Y3IWc3giqSfF2CZjwyKppvszpGVXggVdKyXIWSgb3XotkOa/dK5D9LclDZuVIp6xL6Pl7vScHb5rzLOOjXvD4maxs9LiMESruFK6AGaLEvGQEBJ3hbZa34StkoYYoWC+CbIO7yVBprQ/rrzg/utPwmJlYPS8M+Xj+bj0y6LaPIDAzZ71KeOxFmdUEIjSE13UpSLGIVSw2pJkAnPCYFVjwee9+d8pCaJOmeWejApHub0oe/Y17Sdp+TTtB2RbmkriplzC0wQXz7P3JrcW4WUGO0DMWCBa0nKPDyLkQ5Y/s++SjTvM8G21H7Kbuq49AYELD0VlQ/1zU+DKU/KQp0CZFZScB7f0ZVJ/TOsk0jP9Yt7+nB0oYI7FTb7 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 23 Jul 2026 12:22:58 +0200 "Vlastimil Babka (SUSE)" wrote: > + Greg and Sasha > > On 7/23/26 01:22, Andrew Morton wrote: > > On Wed, 22 Jul 2026 10:56:47 -0400 Johannes Weiner wrote: > > > >> > >> Fixes: e3aa7df331bc ("mm: page_alloc: defrag_mode") > >> Cc: > >> Signed-off-by: Johannes Weiner > > > > This cc:stable fix doesn't apply to current mainline because the > > preceding non-cc:stable patches get in the way. > > > > This means that the -stable maintainers will have to ask you to redo > > the fix to make it backportable. And you'll then be preparing a patch > > which hasn't had standalone testing in mainline. All very cumbersome. > > Or they backport the whole series, even if only 4/4 has a Fixes: tag. Sure. > I don't think it's necessary, the stable team are quite capable of figuring > out the deps and backporting them with a Stable-dep-off: tag. What's that. hp2:/usr/src/25> grep -ri stable-dep ../gitlog Documentation hp2:/usr/src/25> > IIRC the > "fake" tagging is discouraged? Maybe they can clarify.