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b=IFHHVyrBZVgf/p621BVefeLQrnQ64RotmK0Nhxzner6OkIaLDr0yQFQu82Fnjr4N+ s7zo5wmscV8l9nU2Fnf8zgNzWUhX5k1ciaC7LHt6iwBacgB1CDaYL5qzHrQxKsLslN scqGayGbbxI6LSnclAm1Yh1GbCvToDD3Jruzolho= Date: Sun, 21 Jul 2024 16:52:25 -0700 From: Andrew Morton To: Linus Torvalds Cc: linux-mm@kvack.org, mm-commits@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [GIT PULL] MM updates for 6.11-rc1 Message-Id: <20240721165225.0c96cdf1a51bcd7630b0afdc@linux-foundation.org> In-Reply-To: References: <20240721145415.fbeb01a853962ef91334f3d1@linux-foundation.org> X-Mailer: Sylpheed 3.7.0 (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: 96902A0011 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: jdsdb8apqgjnmgwdxfmq6boggp56tpir X-HE-Tag: 1721605947-869151 X-HE-Meta: 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 px00Easx 8xw28MM0dqLcyDBQfSTyqtzPRHYdHQOWxfrRo0qcYZ49/CKdChemNe3zIYFVuIvqtU4E5S5ixaRYcQHqL7FFhagVfgVJBbqgZm5Itr0y8eSUw7ecWzmrTaLf/T0h4/uJqN5US4EdxudnS9WYRFfVpRqkJh39WdPmraFP3ZLLgDM4nWRZZhJb0iFNrdkZq7anQMcRnIY+DtCI36rb54bw5EG2EaXoTFo2eLJTltrv8juYN31Qvh/xW7+fLbLoUWuL+wVh9o6/NaN/uspjl9SAqNCLWxoJVeI0h5DJb85LIkMSjEBuhFH8KQcsbODWP/ggX+QrehIoaR2pWI5KDCDLwEge6Rc4lUjUJ0UySMd4ho+IK1+E= 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 Sun, 21 Jul 2024 16:19:42 -0700 Linus Torvalds wrote: > On Sun, 21 Jul 2024 at 14:54, Andrew Morton wrote: > > > > - 875fa64577da ("mm/hugetlb_vmemmap: fix race with speculative PFN > > walkers") is known to cause a performance regression > > (https://lore.kernel.org/all/3acefad9-96e5-4681-8014-827d6be71c7a@linux.ibm.com/T/#mfa809800a7862fb5bdf834c6f71a3a5113eb83ff). > > Yu has a fix which I'll send along later via the hotfixes branch. > > That commit "875fa64577da" does not exist. I think you are talking > about commit bd225530a4c7, which is in 6.10 and came in from your last > hotfixes pull. > > I'm assuming 875fa64577da was some commit ID it had before getting > rebased or something? > > I'm also a bit confused about why you mention this, since neither the > cause _nor_ the fix are in this pull request and you have the wrong > commit ID. > Yes, right, sorry. "mm/hugetlb_vmemmap: fix race with speculative PFN walkers" was promoted into mm-hotfixes after I make this note. Anyway. We broke a thing and it's being fixed.