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b=Xs2vPNlWlwn4+dq3tRtP4qVzZfZGfwX/gEawrKAvQNIY0MCF2rSSLgpmnxeM6Jxg8 G7oKtLEN2iou5zuDwWT9nyy4p2GnkzDcBs+laXkqH/JzgyOEf4Dkz6IA1BOMI5bRZ6 KqLkPpu3/qPNpqjHsSQ7puI4cK9BtmSwAL41L/uQ= Date: Thu, 31 Oct 2024 18:12:42 -0700 From: Andrew Morton To: =?ISO-8859-1?Q?Ma=EDra?= Canal Cc: Jonathan Corbet , Hugh Dickins , Barry Song , David Hildenbrand , Ryan Roberts , Baolin Wang , Lance Yang , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-dev@igalia.com Subject: Re: [PATCH v3 0/4] mm: add more kernel parameters to control mTHP Message-Id: <20241031181242.96312cd4eff58ba2369342c8@linux-foundation.org> In-Reply-To: References: <20241030130308.1066299-1-mcanal@igalia.com> <20241030155059.9e27019842ef7c009b728b27@linux-foundation.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=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Queue-Id: 922B5C0007 X-Rspamd-Server: rspam01 X-Stat-Signature: pnc4h1wiqaun9ka5699pcbwgpjm9566m X-HE-Tag: 1730469103-823507 X-HE-Meta: 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 GTZNTFPy ZKp2OJXMkcij6TesvvKqtk6wJ2cspMV1t26ZWAm69NP7lZzy5bg1Is2GT7MbHDmmETsmAFcYEEfQsnj4Mi8YBEcfrEyno2+YpMtJEIfT5hMLSi7dRlI/g3SGoiKSK8uosJx8GSj4PKNnOqeFeneohXDCcNYS5EydDnrd0DydZcM5qJBQfZYsxDVJaxdbOnzquVfL8Qe0xUvlT4oT52rX8s4ooZDTxqcAL46Xg8LzUuVtNSxG+PTAKEETPMcCrU6x8GWCE2RV9KWxy0lVIa2nGFDy2MRxe6I/urjsPWDZJHmpsJIzkbu7+wg/KJA== 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 Thu, 31 Oct 2024 08:04:58 -0300 Ma=EDra Canal wrote: > > There isn't a lot of info here - please explain this timing issue in > > more detail. > >=20 > > Because the question which leaps to mind is: shouldn't the > > "applications that use shmem" be changed to "configure mTHP through > > sysfs" *before* "using shmem"? Seems pretty basic. >=20 > Sorry about that, I'll try to improve the commit messages and add more=20 > details. >=20 > As mentioned in the example I gave ("DRM GEM objects"), my main use is > GEM objects backed by shmem. I'd like to use Huge Pages on the GPU and I > can only do that if I have contiguous memory to back my objects. >=20 > I can't think how I can change sysfs from a DRM driver. So your term "applications" actually refers to in-kernel drivers?