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From:   Shakeel Butt <shakeelb@google.com>
Date:   Tue, 7 Sep 2021 09:49:16 -0700
Message-ID: <CALvZod5Q_K=xLpBWTLgg38X_w23HVSyqW2_Jnz7p=JR+kDD_-w@mail.gmail.com>
Subject: Re: [memcg] 0f12156dff: will-it-scale.per_process_ops -33.6% regression
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Jens Axboe <axboe@kernel.dk>,
        kernel test robot <oliver.sang@intel.com>,
        Vasily Averin <vvs@virtuozzo.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Andrei Vagin <avagin@gmail.com>,
        Borislav Petkov <bp@alien8.de>, Borislav Petkov <bp@suse.de>,
        Christian Brauner <christian.brauner@ubuntu.com>,
        Dmitry Safonov <0x7f454c46@gmail.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        "J. Bruce Fields" <bfields@fieldses.org>,
        Jeff Layton <jlayton@kernel.org>,
        Jiri Slaby <jirislaby@kernel.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Kirill Tkhai <ktkhai@virtuozzo.com>,
        Michal Hocko <mhocko@kernel.org>,
        Oleg Nesterov <oleg@redhat.com>, Roman Gushchin <guro@fb.com>,
        Serge Hallyn <serge@hallyn.com>, Tejun Heo <tj@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Yutian Yang <nglaive@gmail.com>,
        Zefan Li <lizefan.x@bytedance.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org,
        kernel test robot <lkp@intel.com>,
        "Huang, Ying" <ying.huang@intel.com>,
        Feng Tang <feng.tang@intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>
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On Tue, Sep 7, 2021 at 9:40 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> On Tue, Sep 7, 2021 at 8:46 AM Jens Axboe <axboe@kernel.dk> wrote:
> >
> > Are we at all worried about these? There's been a number of them
> > reported, basically for all the accounting enablements that have been
> > done in this merge window.
>
> We are worried about them. I'm considering reverting several of them
> because I think the problems are
>
>  (a) big
>
>  (b) nontrivial
>
> and the patches clearly weren't ready and people weren't aware of this issue.
>

Sounds good to me. Please let me know which patches you are planning
to revert. I will work on the followup to make those acceptable.

thanks,
Shakeel