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Thu, 18 Jun 2026 16:32:33 +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 QS63BqEdNGo4GAAAD6G6ig (envelope-from ); Thu, 18 Jun 2026 16:32:33 +0000 Date: Thu, 18 Jun 2026 17:32:31 +0100 From: Pedro Falcato To: Suren Baghdasaryan Cc: Lorenzo Stoakes , Jan Kara , kernel test robot , Frederick Mayle , oe-lkp@lists.linux.dev, lkp@intel.com, Andrew Morton , Kalesh Singh , David Hildenbrand , Matthew Wilcox , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [linux-next:master] [mm] 7b32f64bc5: pts.svt-av1.Preset13.Bosphorus4K.frames_per_second 45.8% regression Message-ID: References: <202606181547.617a6967-lkp@intel.com> <6z2rqmo7b6m2rdhqurspwya25ps4dj7lctdygnmq3rn4xt6h3i@57kiiy72epgd> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Stat-Signature: zwdq1o65gjyaa8xhj7ani3qtk8kwjxw1 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 9078E160014 X-HE-Tag: 1781800355-812469 X-HE-Meta: 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 aa6SUkpL 5NVSniS6ZX7OG16IMJgx/tWB0/1qCoT2fm/V/AXsO9Nh9jW6VZrT7o4ipFZXFu7PGQXhq5e55R19dqL8MnMvEegURmHQKQWfl4dCY6wwNW9YFRVTccPzW5bEuqSIDx4FV5btz4CHyambRWw0Y6kIN0N9JHhS21fUr/TFVtwnFjE+HPhlLp8FjsyV6n39DNtNtKEWCKLSbLS/dFJJPnsDSzBCNopm9GAIyaq6/UmUcOTJrNTgoLGOWEU9LwpWzHoQmSv38oH+85HbEYoJi6mUZO0chcVKt54pmMX/RC/GEwWxDzk4O4IRww2xNDwuIq0v7Pk+3Vwm0KMtyEb+KVNsLZ8mjcPGW3gzt+T9ir579leN6o10JwLWDRXYspi/pFUPaB/SlV7epQIkDK2vLIHKFFK9kW+epf542u5CzhNv6/M9foMM= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Jun 18, 2026 at 04:03:43PM +0000, Suren Baghdasaryan wrote: > On Thu, Jun 18, 2026 at 2:30 PM Lorenzo Stoakes wrote: > > > > On Thu, Jun 18, 2026 at 11:30:47AM +0200, Jan Kara wrote: > > > On Thu 18-06-26 16:00:42, kernel test robot wrote: > > > > Hello, > > > > > > > > kernel test robot noticed a 45.8% regression of pts.svt-av1.Preset13.Bosphorus4K.frames_per_second on: > > > > > > This one looks serious enough and real. It would be good to figure out what > > > happens in this benchmark that it benefits from the readahead across VMA > > > boundaries so much... > > > > I think a revert first no? This seems pretty huge for something that isn't key > > to the kernel, then a new attempt can be tried with this issue addressed > > perhaps? > > A quick search yields: "The > pts.svt-av1.Preset13.Bosphorus4K.frames_per_second is a benchmarking > metric from the Phoronix Test Suite that measures how many frames per > second a CPU can encode using the open-source SVT-AV1 video encoder." > > If this is a video encoding benchmark I would expect it to explicitly > prefetch the data from the disk before measuring the encoding speed. > If limiting readahead caused this regression, I suspect the benchmark > doesn't explicitly prefetch the data... Well, commonly video data doesn't actually fit in memory :) A quick look at the code (I think it's https://gitlab.com/AOMediaCodec/SVT-AV1/-/blob/master/Source/App/app_process_cmd.c#L821) suggests it is progressively mapping the file data for a given frame (or frames?). So the old behavior would result in page faults for a given frame starting readahead for the next few frames. This looks reasonable. FWIW I suspected this was a really weird case regarding mprotect or something, and I'm happy it isn't; but at least I had a suggestion for that - for this, maybe dropping the change (for now?) is the best course of action. -- Pedro