linux-kernel - Re: [PATCH 0/2] /proc/stat: Reduce irqs counting performance overhead

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Date:   Tue, 8 Jan 2019 02:49:01 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Daniel Colascione <dancol@...gle.com>
Cc:     Dave Chinner <david@...morbit.com>,
        Waiman Long <longman@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        Miklos Szeredi <miklos@...redi.hu>,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH 0/2] /proc/stat: Reduce irqs counting performance overhead

On Mon, Jan 07, 2019 at 05:41:28PM -0500, Daniel Colascione wrote:
> There should be a general-purpose way for /proc file readers to tell
> the kernel which bits of information interest them on a particular read
> syscall sequence or particular open(2) or something.

This opens a pandora box full of ioctls. /proc supports ioctls on files
which aren't /proc/$PID and /proc/sys/* though.

So people made a mess with allegedly easy text files and now they
continue to make even more mess adding ioctls on top.