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Howlett" , Suren Baghdasaryan , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com Subject: Re: [PATCH v4 06/22] slab: add sheaves to most caches Message-ID: References: <20260123-sheaves-for-all-v4-0-041323d506f7@suse.cz> <20260123-sheaves-for-all-v4-6-041323d506f7@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260123-sheaves-for-all-v4-6-041323d506f7@suse.cz> X-Debian-User: leitao X-Rspamd-Server: rspam11 X-Stat-Signature: f5x4gz5nny8jkpkufuqwocbem9d6znjh X-Rspam-User: X-Rspamd-Queue-Id: 6B9CDA0008 X-HE-Tag: 1769435993-527996 X-HE-Meta: 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 xFzCYG+K Ji4EblrS9US+p/VhHD6Okml2sE8TW3ph0H3bdXx28KUjsA9qrvVWLSX3cJTtyOqVlp1A3rgpCo/Ewkjp96HI7lAD8zZoS6eDDrP2c99XOWKXjapq7ksqSBsTSZHiK1pO52OJKx0St+CbPDb5shOex06EGBS5LQPbbFESH6tDD8oYpfhsbnrMO/DJ+cLPVNcZvf8zWVm4TqeOSTyI= 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 Fri, Jan 23, 2026 at 07:52:44AM +0100, Vlastimil Babka wrote: > In the first step to replace cpu (partial) slabs with sheaves, enable > sheaves for almost all caches. Treat args->sheaf_capacity as a minimum, > and calculate sheaf capacity with a formula that roughly follows the > formula for number of objects in cpu partial slabs in set_cpu_partial(). > > This should achieve roughly similar contention on the barn spin lock as > there's currently for node list_lock without sheaves, to make > benchmarking results comparable. It can be further tuned later. > > Don't enable sheaves for bootstrap caches as that wouldn't work. In > order to recognize them by SLAB_NO_OBJ_EXT, make sure the flag exists > even for !CONFIG_SLAB_OBJ_EXT. > > This limitation will be lifted for kmalloc caches after the necessary > bootstrapping changes. > > Also do not enable sheaves for SLAB_NOLEAKTRACE caches to avoid > recursion with kmemleak tracking (thanks to Breno Leitao). > > Reviewed-by: Suren Baghdasaryan > Reviewed-by: Harry Yoo > Signed-off-by: Vlastimil Babka Tested-by: Breno Leitao