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From: Hao Li To: "Vlastimil Babka (SUSE)" Cc: Harry Yoo , Suren Baghdasaryan , Shakeel Butt , Alexander Potapenko , Marco Elver , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: [PATCH v3 09/13] mm/slab: introduce slab_obj_ext_has_codetag() Message-ID: References: <20260727-b4-objext_split-v3-0-c29ef0f1f257@kernel.org> <20260727-b4-objext_split-v3-9-c29ef0f1f257@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260727-b4-objext_split-v3-9-c29ef0f1f257@kernel.org> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: f7nu85jq5xg5sy4rqod6oqkk67ifcwf9 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: A03341C000A X-Rspam-User: X-HE-Tag: 1785411790-254195 X-HE-Meta: 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 1lImPFA9 TFF1c4uFFycLQYwsj1dxh45JH5vkrp+wkqE88iJGhwQ28rzJMpr3EaRJUxncLDwaexcf94QRFcV4YjskEi/O8yh37pe1dyEuiMhc/b7s2FPQJkv/DUNgCh4xtkgLGZaiii+xaYFKys33FlAjK1reY+xpmQOBJVVElwdY5RP3AXx3yppN6Z8otKFPkw3ywydO1V3UPSPYdxoeHPOOZfuA+sXKV0FE62Bp9S7YjIbIZHsg0rum3lbfDRphL/NWyQmNjig985KwSkqP7GzMqQqz80M47wgsQ7TUXsm7p87O2jQXF7Uc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jul 27, 2026 at 02:54:03PM +0200, Vlastimil Babka (SUSE) wrote: > mem_alloc_profiling_enabled() allows evaluating (with a static key) if > memory profiling is currently enabled. mem_profiling_support is a > variable where false means it's not possible to enable it anymore, > because the system was booted with "never" or it was later shut down. > This is possible to query by mem_alloc_profiling_permanently_disabled(). > > To make slabobj_ext array size handling dynamic, we need a snapshot of > mem_alloc_profiling_permanently_disabled() early in boot, so that's not > affected by a later shutdown. We also need it to be static key based for > performance. Neither mem_alloc_profiling_enabled() nor > mem_alloc_profiling_permanently_disabled() satisfy this. > > Therefore introduce slab_obj_ext_has_codetag() with an underlying static > key for that use case. Its state is made to reflect the result of > mem_alloc_profiling_permanently_disabled() during kmem_cache_init(), > which does happen after setup_early_mem_profiling(). > > Reviewed-by: Suren Baghdasaryan > Signed-off-by: Vlastimil Babka (SUSE) LGTM. Reviewed-by: Hao Li -- Thanks, Hao