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

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Message-ID: <20200701121344.GA14149@lst.de>
Date:   Wed, 1 Jul 2020 14:13:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        netfilter-devel@...r.kernel.org, lkp@...ts.01.org
Subject: Re: [fs] 140402bab8: stress-ng.splice.ops_per_sec -100.0%
 regression

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.