Re: [seq_file] 5fd6060e50: stress-ng.eventfd.ops_per_sec -49.1% regression

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To: kernel test robot <oliver.sang@xxxxxxxxx>
Subject: Re: [seq_file] 5fd6060e50: stress-ng.eventfd.ops_per_sec -49.1% regression
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Fri, 19 Mar 2021 12:31:57 -0700
Cc: 0day robot <lkp@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, lkp@xxxxxxxxxxxx, ying.huang@xxxxxxxxx, feng.tang@xxxxxxxxx, zhengjun.xing@xxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Lee Duncan <lduncan@xxxxxxxx>, Chris Leech <cleech@xxxxxxxxxx>, Adam Nichols <adam@xxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-hardening@xxxxxxxxxxxxxxx
In-reply-to: <20210319140742.GC30349@xsang-OptiPlex-9020>

On Fri, Mar 19, 2021 at 10:07:42PM +0800, kernel test robot wrote:
> FYI, we noticed a -49.1% regression of stress-ng.eventfd.ops_per_sec due to commit:

Well, so it can be seen. ;) Though I feel slightly better that it's stress-ng
instead of a "normal" workload.

Thanks for the report!

-- 
Kees Cook

References:
- [PATCH v2] seq_file: Unconditionally use vmalloc for buffer
  - From: Kees Cook
- [seq_file] 5fd6060e50: stress-ng.eventfd.ops_per_sec -49.1% regression
  - From: kernel test robot

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