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h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ZfSKm3/E6RiE/tCV6VIRZLG2thsq7KkBEVsP0etcc1LaZDPn8g9dwuta9RB+/3K3f zk2BxycXTmSMfN160LDV3jpuZtb3shabZBxoAzOn7CHD25y8iWsbD2/9zDyaTQNUcr RQvJuG3x3sqbV5xPJhWh9EHfUZw1Zww9rGuVrDzA= Date: Mon, 28 Jul 2025 15:16:04 -0700 From: Andrew Morton To: Patryk Kowalczyk Cc: Baolin Wang , hughd@google.com, ville.syrjala@linux.intel.com, david@redhat.com, willy@infradead.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com, rodrigo.vivi@intel.com, tursulin@ursulin.net, christian.koenig@amd.com, ray.huang@amd.com, matthew.auld@intel.com, matthew.brost@intel.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] mm: shmem: fix the shmem large folio allocation for the i915 driver Message-Id: <20250728151604.e834daa64e8c816aeffba975@linux-foundation.org> In-Reply-To: References: <0d734549d5ed073c80b11601da3abdd5223e1889.1753689802.git.baolin.wang@linux.alibaba.com> <20250728144424.208d58d5a95057ee7081ccd8@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-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1C7B1100005 X-Stat-Signature: dhcpadqk6x4set6x5pmruxbrgb9tjzf9 X-HE-Tag: 1753740966-899031 X-HE-Meta: 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 bQFwIMDG 7BNHBsh4T1OrOEI4XGN5EgYAfhCB5BWlTxMjzC8s1064DY+IxX6+5ziEKNErTMWeiFocyvRdXgK4Mbjd1sPh1qTe+xT5meI7x55kjTdaJ5E9R3l1H5YBv/vKjHmSgGGUHstw/E4folD/j25CJsdRsw/EdvRc1Y+v8ee4r0Q1XUg1o0GVVN40aNemS19/lco+TX7F7nyCYnsKLvHkJ5c6id526sUtN6G50eAAFqnyIVb7tYr2zmx1GBImMGga7syBnW7n0nbuHufGHB6vS08DteP/dhbXL/eIWvwZmvqMzyexnpNAyD+nmnsHFoPuBM6YRk0NUOURiUXQ4wm1gbCszHhmrAft1LxKagb2QFvjjzsT+KrKbJojUTjwJjA== 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 Mon, 28 Jul 2025 23:59:22 +0200 Patryk Kowalczyk wrote: > In my tests, the performance drop ranges from a few percent up to 13% in > Unigine Superposition > under heavy memory usage on the CPU Core Ultra 155H with the Xe 128 EU GPU. > Other users have reported performance impact up to 30% on certain workloads. > Please find more in the regressions reports: > https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/14645 > https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/13845 > > I believe the change should be backported to all active kernel branches > after version 6.12. OK, thanks. I added this (important!) info to the changelog and I added a cc:stable, requesting a backport into everything which has acd7ccb284b8. I'll place this in mm.git's mm-hotfixes-unstable branch with a plan to upstream it sometime during the 6.17-rcX cycle.