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Tue, 20 Feb 2024 18:16:58 +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 aaHKNZrs1GXZbwAAD6G6ig (envelope-from ); Tue, 20 Feb 2024 18:16:58 +0000 Message-ID: <96c51d35-15ce-42d0-b81b-7e76044e1f2b@suse.cz> Date: Tue, 20 Feb 2024 19:16:58 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: regression/bisected commit 773688a6cb24b0b3c2ba40354d883348a2befa38 make my system completely unusable under high load Content-Language: en-US To: Andrew Morton , Mikhail Gavrilov Cc: Marco Elver , Andrey Konovalov , glider@google.com, dvyukov@google.com, eugenis@google.com, Oscar Salvador , Linux List Kernel Mailing , Linux Memory Management List References: <91c50335-e7b6-4ae1-9dad-a0c990b52021@suse.cz> <20240219152836.11d36709c594e66fe3037f2d@linux-foundation.org> <7e31accb-db01-486f-afb8-18a3f5402d00@suse.cz> <20240220093011.bf84486d704c3814079c2aa0@linux-foundation.org> From: Vlastimil Babka In-Reply-To: <20240220093011.bf84486d704c3814079c2aa0@linux-foundation.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: C6ACA1C001E X-Stat-Signature: kcdy6b598toczdcmgoibwc1oafrtaknk X-HE-Tag: 1708453020-854594 X-HE-Meta: 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 9TLoKezh ilYx9zknSKtJMYQTMgfyOLfreM3y/7rp9lf+2G8IiUFpy1+K44WDUwogmdUiiYAkTmru2fP3ReTFfX3nzduUWR788f2G/eo8w2FxdM2a1RJ9sLdkuMGfgKCZXq31AP6+/jE3KarDKwiWyMJ+/1iQLNDOV/IN2hyd2FqvVsnUPfjkjZ7XZgpNQ2qjV0kO/aPAXTXTDboo3kRQBNHTRGxsgt13DESS7F4SIocgWLzo/HACQzvbcD6PT1/3SZx/Xia3s3mL4p3Jp48elPPE39RB65U1dVLfFuaQny1N4E7oIyHSTrYd5npZcGN01zeAaaxGpAmS9fJAQi22lVlY+i3PvZDMP4fkHXIFScDWyBPEllxAUrKXgiZar+4WPArXJ/79oB3sfKgX8DBvYW2T0T7pVwouHNYouYryTYztpbanEbckf79csZVFjp/jhv0iL0b50PbZ0Lp6pnXFk422D6kXm9cLCo4e0SGEtqRaI6rhoZKS1gEQ= 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 2/20/24 18:30, Andrew Morton wrote: > On Tue, 20 Feb 2024 10:37:03 +0500 Mikhail Gavrilov wrote: > >> On Tue, Feb 20, 2024 at 4:50 AM Vlastimil Babka wrote: >> > > >> > > I'm all confused. >> > > >> > > 4434a56ec209 ("stackdepot: make fast paths lock-less again") was >> > > mainlined for v6.8-rc3. >> > >> > Uh sorry, I just trusted the info that it's not merged and didn't verify >> > it myself. Yeah, I can see it is there. >> > >> >> Wait, I am talk about these two patches which is not merged yet: >> [PATCH v2 1/2] stackdepot: use variable size records for non-evictable entries >> [PATCH v2 2/2] kasan: revert eviction of stack traces in generic mode >> https://lore.kernel.org/linux-mm/20240129100708.39460-1-elver@google.com/ > > A can move those into the 6.8-rc hotfixes queue, and it appears a > cc:stable will not be required. > > However I'm not seeing anything in the changelogs to indicate that > we're fixing a dramatic performance regression, nor why that > regressions is occurring. We also seem have an unhappy bot with the 2/2 patch :/ although it's not yet clear if it's a genuine issue. https://lore.kernel.org/all/202402201506.b7e4b9b6-oliver.sang@intel.com/