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Fri, 22 Nov 2024 07:03:28 -0800 (PST) MIME-Version: 1.0 References: <20241121162826.987947-1-surenb@google.com> <20241121162826.987947-3-surenb@google.com> <20241122110557.GO24774@noisy.programming.kicks-ass.net> In-Reply-To: <20241122110557.GO24774@noisy.programming.kicks-ass.net> From: Suren Baghdasaryan Date: Fri, 22 Nov 2024 07:03:17 -0800 Message-ID: Subject: Re: [PATCH v2 3/3] mm: introduce mmap_lock_speculate_{try_begin|retry} To: Peter Zijlstra 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 8E1A820006 X-Stat-Signature: zn6n8n6gp86ipd8dknoh4wbicd7mt6fb X-Rspam-User: X-HE-Tag: 1732287750-212649 X-HE-Meta: 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 4XPzMi6q RlrsLjZfuxjaTEQ5NDlCBCKRwkMUSxmVRpQFVwjKFaZ/zwvXDwgeQpowgN00cJdCqMElqJ23IpsT8JuHoWCkJHiMhiXl7k72wnNcvyrd5JTqsste9o/s4gdIIBl1dhTVTpeCexxmUmHPP3GrLaYIouCi+eVxqioSj0kncz7j78oECjzPmRCJCbjBK2lbGCqyeztoaUSjDwN1ZKwLap+m45A9DtHWuBYQ69sK5uSySxdsdcKXoNXk/bemAEKp/xLxdl9FsVMUCWdHDp7uLR65r+5xn662c1Xjk+9q7+kro99s6T2zTICMzgMADBbAa3AtzGCkFKfd/CRORW6FyAQb3xhRMUwAD8HbQO2r0X7XF7sqIOpkKT/ojVse5lqhzwFau6Ur+YMEJxKK+WqA4frfHCpGT2BgZPHJbESxhBwYFKtLpMWY= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, 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, Nov 22, 2024 at 3:06=E2=80=AFAM Peter Zijlstra wrote: > > 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? Yes, I'm fine with that plan. Thank you!