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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 6 Nov 2020 15:35:22 -0800
Message-ID: <CAHk-=whM-Cm52o1kBQD4eS3Wx=XWr_z7sq=H88pmyeK_9L0=VQ@mail.gmail.com>
Subject: Re: [PATCH 0/8] simplify ep_poll
To:     Soheil Hassas Yeganeh <soheil.kdev@gmail.com>
Cc:     Al Viro <viro@zeniv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Davidlohr Bueso <dave@stgolabs.net>,
        Eric Dumazet <edumazet@google.com>,
        Willem de Bruijn <willemb@google.com>,
        Khazhismel Kumykov <khazhy@google.com>,
        Guantao Liu <guantaol@google.com>,
        Soheil Hassas Yeganeh <soheil@google.com>
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On Fri, Nov 6, 2020 at 3:17 PM Soheil Hassas Yeganeh
<soheil.kdev@gmail.com> wrote:
>
> The first patch in the series is a fix for the epoll race in
> presence of timeouts, so that it can be cleanly backported to all
> affected stable kernels.
>
> The rest of the patch series simplify the ep_poll() implementation.
> Some of these simplifications result in minor performance enhancements
> as well.  We have kept these changes under self tests and internal
> benchmarks for a few days, and there are minor (1-2%) performance
> enhancements as a result.

From just looking at the patches (not the end result - I didn't
actually apply them), it looks sane to me.

             Linus