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Fri, 23 Jan 2026 10:06:00 -0800 (PST) MIME-Version: 1.0 References: <20260123-sheaves-for-all-v4-0-041323d506f7@suse.cz> <20260123-sheaves-for-all-v4-8-041323d506f7@suse.cz> In-Reply-To: <20260123-sheaves-for-all-v4-8-041323d506f7@suse.cz> From: Alexei Starovoitov Date: Fri, 23 Jan 2026 10:05:48 -0800 X-Gm-Features: AZwV_QjSjoenDUCyXmvsb5KH8Pd0BwP5NV53NJnMQ1RHDoaNt4mnnL7gEc0SK7E Message-ID: Subject: Re: [PATCH v4 08/22] slab: make percpu sheaves compatible with kmalloc_nolock()/kfree_nolock() To: Vlastimil Babka Cc: Harry Yoo , Petr Tesarik , Christoph Lameter , David Rientjes , Roman Gushchin , Hao Li , Andrew Morton , Uladzislau Rezki , "Liam R. Howlett" , Suren Baghdasaryan , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm , LKML , "open list:Real-time Linux (PREEMPT_RT):Keyword:PREEMPT_RT" , bpf , kasan-dev Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Queue-Id: 0E51C1C000D X-Rspamd-Server: rspam07 X-Stat-Signature: 4ezntd4j4kaencrmd1t3r1k7wm46za99 X-HE-Tag: 1769191561-70440 X-HE-Meta: U2FsdGVkX1/Emq5lE2zBbmA9oJ1p2a9XJTBzoF3Eg60bg7f1MpvZXQVFE5NeJapAm9DhxcW17DElD88CObGuau1DtKET/WGWa3liEv2hfXx5c/BcCSX6ZgQR87jW4wIJK0zao9bR2hGO45+PXFN8Y4GnGDKxPLsGQM+ZPqg+Yo4ml1R0cAFVaC86xnbZJMYkToXZ3lWfrzdOne84hEVQpjf5nd6jkhjU/8EppdJLMNKVHQQfPS4oKHeXOKc37iCCkuc/JVOGAtFjyHiaYeT8+XqZLuTTgu3HSAG0lNrSAsiKC34kH2YpsM4i6LLXQ9GKVmfbUBekHQkQz/mALRxh0xIWiFqc6vVbCiTFGou6U3m6vCuKHMYitXxCHVH2gssaBGUO1n03bxI4D4HIRjj/+Swk0sITXg4oyz/sIy0ZH6o/NXeSD8wK4Be2g7DvttL2PY2LPD+QCmvi6LcjC3POopTf+hJBQmneRO3jZs45nFImqzWndGUL62IIbwzhuZ7l4jcF9fYHqncdXUDdfgGIslMgVB6YDhFoseh1cDHtdfyZw0M9LcT96mKY5RWC2uPdrQ1fXRK3AU+JwDa5CvvhYdENXpMoubsZxgGWbld1r4KjdK3yH4wyC5pBzgQK4c8QC+dVjI4HGXaW9nFjIGz9I8iKVmXj9iwa/iGLndNnG4uIjO+jDOHYHYa42da3iwNIVGaMJRhWtfhFAwTCazoK1p4ax6whwDC7Rv4AtU7WQz06hb4flreij+46wwPFpRe4kitw4o5mTYc4s6bS7IEFOAjxKWlCg52U0j82tOf/KnIH9vMre6En+eZrBRF+PcCZPDhou20yRDYiwSJ8S/XBYCl83nucWMP8nn17HpGoniMMMqli+32suHXfNHuxd/nHSDOqeFJCyUhoS4ss334gm2u7J/eipbXA92yVbZVWWorJ8JZdAyHy40JXTA5jmwEcgfK0BkUSHaXpqHcbAZ8 YIRP34gL 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 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, Jan 22, 2026 at 10:53=E2=80=AFPM Vlastimil Babka w= rote: > > Before we enable percpu sheaves for kmalloc caches, we need to make sure > kmalloc_nolock() and kfree_nolock() will continue working properly and > not spin when not allowed to. > > Percpu sheaves themselves use local_trylock() so they are already > compatible. We just need to be careful with the barn->lock spin_lock. > Pass a new allow_spin parameter where necessary to use > spin_trylock_irqsave(). > > In kmalloc_nolock_noprof() we can now attempt alloc_from_pcs() safely, > for now it will always fail until we enable sheaves for kmalloc caches > next. Similarly in kfree_nolock() we can attempt free_to_pcs(). > > Reviewed-by: Suren Baghdasaryan > Reviewed-by: Harry Yoo > Reviewed-by: Hao Li > Signed-off-by: Vlastimil Babka Acked-by: Alexei Starovoitov