linux-kernel - Re: [PATCH v2 0/2] close

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Message-ID: <CAHk-=wj5YZQ=ox+T1kc4RWp3KP+4VvXzvr8vOBbqcht6cOXufw@mail.gmail.com>
Date:   Thu, 23 May 2019 14:34:31 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     Christian Brauner <christian@...uner.io>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] close_range()

On Thu, May 23, 2019 at 11:22 AM Alexey Dobriyan <adobriyan@...il.com> wrote:
>
> > This is v2 of this patchset.
>
> We've sent fdmap(2) back in the day:

Well, if the main point of the exercise is performance, then fdmap()
is clearly inferior.

Sadly, with all the HW security mitigation, system calls are no longer cheap.

Would there ever be any other reason to traverse unknown open files
than to close them?

                   Linus