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[209.85.167.45]) by smtp.gmail.com with ESMTPSA id h3sm348904lfu.3.2021.09.16.13.45.00 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 16 Sep 2021 13:45:00 -0700 (PDT) Received: by mail-lf1-f45.google.com with SMTP id y28so23580142lfb.0 for ; Thu, 16 Sep 2021 13:45:00 -0700 (PDT) X-Received: by 2002:a05:6512:94e:: with SMTP id u14mr5405742lft.173.1631825100363; Thu, 16 Sep 2021 13:45:00 -0700 (PDT) MIME-Version: 1.0 References: <64b88941-9ec0-8552-d05d-6503497f6f9d@MichaelLarabel.com> In-Reply-To: <64b88941-9ec0-8552-d05d-6503497f6f9d@MichaelLarabel.com> From: Linus Torvalds Date: Thu, 16 Sep 2021 13:44:44 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: memcg: infrastructure to flush memcg stats To: Shakeel Butt , Marek Szyprowski , Andrew Morton , Feng Tang , Michael Larabel Cc: Linux MM , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: qr61efzm5r9584gatdkirjejjttzxwwx Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=UQT4LUXa; dmarc=none; spf=pass (imf10.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.167.45 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0CB2660019AA X-HE-Tag: 1631825104-706832 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: So the kernel test robot complained about this commit back when it was in the -mm tree: https://lore.kernel.org/all/20210726022421.GB21872@xsang-OptiPlex-9020/ but I never really saw anything else about it, and left it alone. However, now Michael Larabel (of phoronix) points to this commit too, and says it regresses several of his benchmarks too. Shakeel, are you looking at this? Based on previous experience, Michael is great at running benchmarks on patches that you come up with. Linus On Thu, Sep 16, 2021 at 2:55 AM Michael Larabel wrote: > > Are you still looking at aa48e47e3906 around performance regressions[1]? > > With 5.15-rc1 on multiple systems I am seeing timed software compilation > tests regressing compared to 5.14. A variety of different software > builds are all slowing down by several percent when running on a 5.15 > kernel. The bisect led back to aa48e47e3906 as the first bad commit. I > can't seem to find any discussions around that patch in more recent days > so figured I'd ping you in case something was missed. > > Thanks, > > Michael > > [1] > https://lists.01.org/hyperkitty/list/lkp@lists.01.org/message/MS2J5FCYQD62W4E5LHHPWC7YH7TWKUSV/ >