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[141.239.158.86]) by smtp.gmail.com with ESMTPSA id k195-20020a6284cc000000b006e4e93f4f17sm9874856pfd.117.2024.04.16.14.38.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Apr 2024 14:38:01 -0700 (PDT) Date: Tue, 16 Apr 2024 11:38:00 -1000 From: Tejun Heo To: Jesper Dangaard Brouer Cc: hannes@cmpxchg.org, lizefan.x@bytedance.com, cgroups@vger.kernel.org, yosryahmed@google.com, longman@redhat.com, netdev@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, shakeel.butt@linux.dev, kernel-team@cloudflare.com, Arnaldo Carvalho de Melo , Sebastian Andrzej Siewior , mhocko@kernel.org Subject: Re: [PATCH v1 0/3] cgroup/rstat: global cgroup_rstat_lock changes Message-ID: References: <171328983017.3930751.9484082608778623495.stgit@firesoul> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <171328983017.3930751.9484082608778623495.stgit@firesoul> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 463A9100006 X-Stat-Signature: suf791tpjgyim6ndgnrkm3khbg9dym1t X-Rspam-User: X-HE-Tag: 1713303483-177940 X-HE-Meta: U2FsdGVkX1+wrozgosZww6kYXb4uMrLIkUFXfzV/l0c5FrtXU/3tmgCnYtdMLbzcv301mnORA/AMo2hr0AUpENiBGHdHarlrTDtfch/QT6Qs3V0IjwvA13ha8Ry3QKfteThRayTYGNXIsL1z6jnuz/0nD2baXMoED9UQ+2giT8X1CywHLwp46/c5sFhVkfAMRRIBp91eqAqs5c05yUfS+eeNyQc7Y5/89oN0NVCdn2+7hNayMU+iTXZD/Jq4nzYAHDzaTKGJRYJ7hDe/dhKq75jsNArzxXUEkH3Z61qXQ+8IpY2OvEiGxkixW2FaoOX7IL61OSvFH9ZUVYKHap2+xbe3vcoJseExIqGyMPgShWiEagfram8/ox7dcOwTYPSgarg0l7xjZ/Zd4x2hST9GFhKYgjAUuLHFos1qpgnyThFfl0NCT+LOOzMfBkUu7MT0z93knL+YNQPF3R8QSSHbroPH8Hc5+jZK+FZN0fIeCDik1W5QKSfRaaNoqaH2ZsMy3fakDV7WJKogVnOgYAeMmIVUtjsxC9i0+ZznLh5GGwKGC4fbwet26R3vSf/i2OAq2jkdB8M7Ztb9wYaLq/osck7Ou5K2dPIqvwPkFmkbsNJNUM5OXLZLzg1+fP+Z0Sez9PwQV8lpPA76FQVbnYlkCDWU3T+G8BgmH/whUvyawmuOuizBvUu3kbtIg8HGGnfTgnbOdXuolyYsCoAKzK2w0p9V75QxcmaDJzdo86dzGvvWTehzHwaT0Acm4NTZwTS1SVrymf8FdEvGUnpeW6gC7f0Cp1/phggeZfmBgacGSOqWZNQNRoL7KXYXfTwHSvfMGDFBOpyL0VZYy3yd1RJV/91jt1lTDmdOFaFDCC/Z82lpGUmEsDIyjSM+h7zAmvkj8FYtUl9Acv1DPRHwbJE4KyXKmUChhupvl8bKeqtPbc5Cb3wweZuazfyxhv9KH7bCL9oitwSg3Mn49Cb5sVY sKWITMaP 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.144205, 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 Tue, Apr 16, 2024 at 07:51:19PM +0200, Jesper Dangaard Brouer wrote: > This patchset is focused on the global cgroup_rstat_lock. > > Patch-1: Adds tracepoints to improve measuring lock behavior. > Patch-2: Converts the global lock into a mutex. > Patch-3: Limits userspace triggered pressure on the lock. Imma wait for people's inputs on patch 2 and 3. ISTR switching the lock to mutex made some tail latencies really bad for some workloads at google? Yosry, was that you? Thanks. -- tejun