linux-kernel - Re: [fs] 140402bab8: stress-ng.splice.ops_per

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Message-ID: <CAHk-=whYihRm0brAXPc0dFcsU2M+FA4VoOiwGGdVLC_sHT=M1g@mail.gmail.com>
Date:   Wed, 1 Jul 2020 13:32:03 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        Al Viro <viro@...iv.linux.org.uk>, Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>, lkp@...ts.01.org
Subject: Re: [fs] 140402bab8: stress-ng.splice.ops_per_sec -100.0% regression

On Wed, Jul 1, 2020 at 5:13 AM Christoph Hellwig <hch@....de> wrote:
>
> FYI, this is because stress-nh tests splice using /dev/null.  Which
> happens to actually have the iter ops, but doesn't have explicit
> splice_read operation.

Heh. I guess a splice op for /dev/null should be fairly trivial to implement..

               Linus