Re: [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per_sec -99.8% regression

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To: kernel test robot <oliver.sang@xxxxxxxxx>
Subject: Re: [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per_sec -99.8% regression
From: Max Kellermann <max.kellermann@xxxxxxxxx>
Date: Wed, 18 Oct 2023 13:12:27 +0200
Cc: oe-lkp@xxxxxxxxxxxxxxx, lkp@xxxxxxxxx, Linux Memory Management List <linux-mm@xxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, ying.huang@xxxxxxxxx, feng.tang@xxxxxxxxx, fengwei.yin@xxxxxxxxx
In-reply-to: <CAKPOu+_T8xk4yd2P4KT4j3eMoFqwYmkxqDHaFtv4Hii5-XyPuA@mail.gmail.com>
References: <202310172247.b9959bd4-oliver.sang@intel.com> <CAKPOu+_T8xk4yd2P4KT4j3eMoFqwYmkxqDHaFtv4Hii5-XyPuA@mail.gmail.com>

On Wed, Oct 18, 2023 at 12:21 PM Max Kellermann
<max.kellermann@xxxxxxxxx> wrote:
> I think this might be caused by a bug in stress-ng, leading to
> blocking pipe writes.

Just in case I happen to be right, I've submitted a PR for stress-ng:
https://github.com/ColinIanKing/stress-ng/pull/326

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References:
- [linux-next:master] [drivers/char/mem] 1b057bd800: stress-ng.splice.ops_per_sec -99.8% regression
  - From: kernel test robot

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