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From: Shakeel Butt To: Dmitry Ilvokhin Cc: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Hugh Dickins , Baolin Wang , Kiryl Shutsemau , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH] mm: shmem/tmpfs hugepage defaults config choice Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 823FD4000B X-Stat-Signature: r8hi1p81po6mtq1qzhd1x5dxfsahbhqp X-Rspam-User: X-HE-Tag: 1761254773-39142 X-HE-Meta: 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 RTScQ2oJ jAFq8h68JgWV18UTzYAqdHqevRWcFV1axPJjw1aM0sgYHaWkmrbuYkI1p/wA93PF/8FlX7r1bplb1nPdCB1kyxPa+ClKFnt7sxlaE30FmLV9v99zSwxKSy3UtvA+wtFXhU9Ep97//E7zDTnE0sFbRRSq49Y9gA5CZFDXgf/fsFqwqmV+lGX+sPsfxWQ2uWOcWKP+f88hXRoKciSGHNSrJocFpMG9RcpVZc68Dm9B7YUivqzFMmcP1yBMC6wTBMZbWN5IOtvsnrlJW2aU= 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, Oct 23, 2025 at 06:12:02PM +0000, Dmitry Ilvokhin wrote: > Allow to override defaults for shemem and tmpfs at config time. This is > consistent with how transparent hugepages can be configured. > > Same results can be achieved with the existing > 'transparent_hugepage_shmem' and 'transparent_hugepage_tmpfs' settings > in the kernel command line, but it is more convenient to define basic > settings at config time instead of changing kernel command line later. > > Defaults for shmem and tmpfs were not changed. They are remained the > same as before: 'never' for both cases. Options 'deny' and 'force' are > omitted intentionally since these are special values and supposed to be > used for emergencies or testing and are not expected to be permanent > ones. > > Signed-off-by: Dmitry Ilvokhin This looks good. I would recommend to also update Documentation/admin-guide/mm/transhuge.rst with this build config information.