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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tERU6-00000000hH8-1UCi; Fri, 22 Nov 2024 11:05:58 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 1DCF430066A; Fri, 22 Nov 2024 12:05:57 +0100 (CET) Date: Fri, 22 Nov 2024 12:05:57 +0100 From: Peter Zijlstra To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, andrii@kernel.org, jannh@google.com, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, mhocko@kernel.org, shakeel.butt@linux.dev, hannes@cmpxchg.org, david@redhat.com, willy@infradead.org, brauner@kernel.org, oleg@redhat.com, arnd@arndb.de, richard.weiyang@gmail.com, zhangpeng.00@bytedance.com, linmiaohe@huawei.com, viro@zeniv.linux.org.uk, hca@linux.ibm.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 3/3] mm: introduce mmap_lock_speculate_{try_begin|retry} Message-ID: <20241122110557.GO24774@noisy.programming.kicks-ass.net> References: <20241121162826.987947-1-surenb@google.com> <20241121162826.987947-3-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241121162826.987947-3-surenb@google.com> X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 7CA0D80014 X-Stat-Signature: tu96ns3z8xh89ky8fx4psf7bpdxmqw6g X-Rspam-User: X-HE-Tag: 1732273467-576889 X-HE-Meta: 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 vUFhwA/b rQHmOQ8lcxJm8gAaAvFmdzzAzvFaMORdQz1qOagwCltLf7NRYS2U85LQZseOdgxbQ9jV1CYj/RQ4e/1NnKp6B9WZfIiXmcMwuJpBJJMABI5LPzURvQFuu5oFiitUd554hdOxkmUAV98fMUdj+pkkXMakbnlyRjFLuIu4rMO0ei0Gb1APGBBfe3zmtJrPsHHNbRvp5WU/39s5lkI6/n7GqrW0lNNDK5SuVXwSwPuAeGGFo/5BztSN2qlmmE+22zGd7+nlOB3qp/Zd0gFz8S9vCjgp6peXrsVXnPbDqYemXf49Ow+2/k+qaV7kH8jbhhT3EBnR6OppkjDcMSz0yBnR0sdq7U6vnGq6u5f+WuV89pF+ARu+rnOu3yaSzl9yxWnW/fUIF6JUBaf5imQ+zcSpCZve9L27eISlkZjXt 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, Nov 21, 2024 at 08:28:26AM -0800, Suren Baghdasaryan wrote: > Add helper functions to speculatively perform operations without > read-locking mmap_lock, expecting that mmap_lock will not be > write-locked and mm is not modified from under us. > > Suggested-by: Peter Zijlstra > Signed-off-by: Suren Baghdasaryan Thanks for these, you're okay with me taking these through tip/perf/core for the next cycle along with Andrii's uprobe patch?