Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1303494

Re: [lkp] [mm/vmstat] 6cdb18ad98: -8.5% will-it-scale.per_thread_ops

Show all headers | View raw

On Wed, Jan 06, 2016 at 11:20:55AM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> commit 6cdb18ad98a49f7e9b95d538a0614cde827404b8 ("mm/vmstat: fix overflow in mod_zone_page_state()")
> 
> 
> =========================================================================================
> compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase:
>   gcc-4.9/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/ivb42/pread1/will-it-scale
> 
> commit: 
>   cc28d6d80f6ab494b10f0e2ec949eacd610f66e3
>   6cdb18ad98a49f7e9b95d538a0614cde827404b8
> 
> cc28d6d80f6ab494 6cdb18ad98a49f7e9b95d538a0 
> ---------------- -------------------------- 
>          %stddev     %change         %stddev
>              \          |                \  
>    2733943 ±  0%      -8.5%    2502129 ±  0%  will-it-scale.per_thread_ops
>       3410 ±  0%      -2.0%       3343 ±  0%  will-it-scale.time.system_time
>     340.08 ±  0%     +19.7%     406.99 ±  0%  will-it-scale.time.user_time
>   69882822 ±  2%     -24.3%   52926191 ±  5%  cpuidle.C1-IVT.time
>     340.08 ±  0%     +19.7%     406.99 ±  0%  time.user_time
>     491.25 ±  6%     -17.7%     404.25 ±  7%  numa-vmstat.node0.nr_alloc_batch
>       2799 ± 20%     -36.6%       1776 ±  0%  numa-vmstat.node0.nr_mapped
>     630.00 ±140%    +244.4%       2169 ±  1%  numa-vmstat.node1.nr_inactive_anon

Hmm... this is odd. I did review all callers of mod_zone_page_state() and
couldn't find anything obvious that would go wrong after the int -> long
change.

I also tried the "pread1_threads" test case from
https://github.com/antonblanchard/will-it-scale.git

However the results seem to vary a lot after a reboot(!), at least on s390.

So I'm not sure if this is really a regression.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[lkp] [mm/vmstat] 6cdb18ad98: -8.5% will-it-scale.per_thread_ops kernel test robot <ying.huang@linux.intel.com> - 2016-01-06 04:30 +0100
  Re: [lkp] [mm/vmstat] 6cdb18ad98: -8.5% will-it-scale.per_thread_ops Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-01-07 12:30 +0100
    Re: [LKP] [lkp] [mm/vmstat] 6cdb18ad98: -8.5% will-it-scale.per_thread_ops "Huang\, Ying" <ying.huang@intel.com> - 2016-01-08 06:30 +0100
      Re: [LKP] [lkp] [mm/vmstat] 6cdb18ad98: -8.5%  will-it-scale.per_thread_ops Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-01-08 12:20 +0100

csiph-web