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Wed, 2 Oct 2024 10:52:23 -0700 (PDT) Date: Wed, 2 Oct 2024 10:52:23 -0700 (PDT) From: "Christoph Lameter (Ampere)" To: Vlastimil Babka cc: Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Yang Shi , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Huang Shijie Subject: Re: [PATCH v3] SLUB: Add support for per object memory policies In-Reply-To: <2cbdf455-f12f-4c40-9d08-527857fb2621@suse.cz> Message-ID: <7914434f-73f8-7527-9b40-5c4557e2ce1e@gentwo.org> References: <20241001-strict_numa-v3-1-ee31405056ee@gentwo.org> <2cbdf455-f12f-4c40-9d08-527857fb2621@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: CEFCD40018 X-Stat-Signature: 6hbbxuipxgommup5bxudk9hyh1shbj5d X-HE-Tag: 1727892193-495647 X-HE-Meta: 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 AGGuK7UI FK6z4+6KupXnniMKsesjiQwB8uweZ72PCHXORoDZ/rT3ruEC97XCrKORKptYCzWiLgN64Ra3aKeykw9iUmzqZXnElY0gdPAV58ey44X5cfowpiNQGn7iLsY+D/5GGP/LI2d8xeYTocPqG12zy2FbkSRYR78h3m7FxI1kBxzA1Vj8M/qUDCHv9sHgt4bgsjSAxr/6brhMt/iqoTCVL6gHniHxXbymEHJ94b3oYMqWHwdLj0XiKHwZ6l9plsihIDhuki+ViU73ZA3twXstsa0kycmE+5AsRD4IMlW/TuCt7cyaIj91weyi7Zfc3mvXplbZOODR+/4RKnbjew39bY0T5t/pHAoZhmt5wsO8QjEwuyLaFLP8Fh0kXYX9W7BLwtH/1rSm/BMuQKg3QJ/c= 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 Wed, 2 Oct 2024, Vlastimil Babka wrote: > OK, but we should document this parameter in: > Documentation/admin-guide/kernel-parameters.rst > Documentation/mm/slab.rst mm/slab.rst is empty? I used slub.rst instead. Here is a patch to add documentation: >From 510a95b00355fcbf3fb9e0325c1a0f0ef80c6278 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 2 Oct 2024 10:27:00 -0700 Subject: [PATCH] Add documentation for the new slab_strict_numa kernel command line option Signed-off-by: Christoph Lameter (Ampere) --- Documentation/admin-guide/kernel-parameters.txt | 10 ++++++++++ Documentation/mm/slub.rst | 9 +++++++++ 2 files changed, 19 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 1518343bbe22..89a4c0ec290c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6544,6 +6544,16 @@ stifb= [HW] Format: bpp:[:[:...]] + slab_strict_numa [MM] + Support memory policies on a per object level + in the slab allocator. The default is for memory + policies to be applied at the folio level when + a new folio is needed or a partial folio is + retrieved from the lists. Increases overhead + in the slab fastpaths but gains more accurate + NUMA kernel object placement which helps with slow + interconnects in NUMA systems. + strict_sas_size= [X86] Format: diff --git a/Documentation/mm/slub.rst b/Documentation/mm/slub.rst index 60d350d08362..84ca1dc94e5e 100644 --- a/Documentation/mm/slub.rst +++ b/Documentation/mm/slub.rst @@ -175,6 +175,15 @@ can be influenced by kernel parameters: ``slab_max_order`` to 0, what cause minimum possible order of slabs allocation. +``slab_strict_numa`` + Enables the application of memory policies on each + allocation. This results in more accurate placement of + objects which may result in the reduction of accesses + to remote nodes. The default is to only apply memory + policies at the folio level when a new folio is acquired + or a folio is retrieved from the lists. Enabling this + option reduces the fastpath performance of the slab allocator. + SLUB Debug output ================= -- 2.39.5