[Bug 99426] gem_mmap_gtt swap tests are too long - perf: interrupt took too long

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99426

            Bug ID: 99426
           Summary: gem_mmap_gtt swap tests are too long - perf: interrupt
                    took too long
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: IGT
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: christophe.prigent at intel.com

Tested on BDW, SNB, SKL, IVB, HSW, BYT with SW config:

Kernel: 4.10.0-rc3 ea7e3e5 branch drm-tip from
https://cgit.freedesktop.org/drm-tip
  commit ea7e3e5c99e316fb6876399f9b32b2372e45c4af
  Author: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
  Date:   Mon Jan 9 16:46:47 2017 +0200
  drm-tip: 2017y-01m-09d-14h-45m-54s UTC integration manifest

libdrm-2.4.74-21 geebefaf from git://anongit.freedesktop.org/mesa/drm
mesa: mesa-13.0.2 c9e993b from git://anongit.freedesktop.org/mesa/mesa
cairo 1.15.4 9fe6683 from git://anongit.freedesktop.org/cairo
xorg-server-1.19.0-38 9d32b71 from git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel 2.99.917-747 028c946 from
git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
libva-1.7.2-45 acbc209 from git://git.freedesktop.org/git/vaapi/libva 
vaapi-intel-driver: 1.7.2-216 70770f9 from
git://git.freedesktop.org/git/vaapi/intel-driver
intel-gpu-tools-1.17 e2eefcc from
http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

Steps:
-------
1. Execute IGT test manually (no timeout is used):
./gem_mmap_gtt --r swap-copy
2. Wait 100 hours

Actual results:
----------------
2. Test is still not finished after 100 hours (IGT is still running - DUT is
not freezed)
dmesg shows the same logs on all platforms, example on SKL:
[  151.322722] [IGT] gem_mmap_gtt: executing
[  151.353973] [IGT] gem_mmap_gtt: starting subtest swap-copy
[  151.354090] gem_mmap_gtt (31952): drop_caches: 4
[ 4843.205005] perf: interrupt took too long (2540 > 2500), lowering
kernel.perf_event_max_sample_rate to 78500
[ 6383.794279] perf: interrupt took too long (3202 > 3175), lowering
kernel.perf_event_max_sample_rate to 62250
[ 9271.093175] perf: interrupt took too long (4037 > 4002), lowering
kernel.perf_event_max_sample_rate to 49500
[14046.280647] perf: interrupt took too long (5090 > 5046), lowering
kernel.perf_event_max_sample_rate to 39250
[22889.758381] perf: interrupt took too long (6365 > 6362), lowering
kernel.perf_event_max_sample_rate to 31250
[50315.915256] perf: interrupt took too long (7982 > 7956), lowering
kernel.perf_event_max_sample_rate to 25000

Expected results:
-----------------
2. Test is not so long

Info:
-----
I can't attach dmesg due to its size
There is no log from IGT

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