[Bug 87729] [BSW/SKL PPGTT Bisected]igt/gem_ctx_thrash causes OOM killer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87729

--- Comment #17 from ye.tian <yex.tian at intel.com> ---
Tested on the latest nightly kernel(044307) and the latest igt(gd36465d).

gem_ctx_thrash two subcases(processes and threads) are good on SKL mobile, 
gem_close_race subcase gem-close-race causes OOM killer on SKL mobile.


gem_ctx_thrash sucases processes is good, threads is fail on BSW
gem_close_race subcase gem-close-race causes OOM killer on BSW.

I will full test next week.

output:
-----------------
root at x-skly03:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./gem_ctx_thrash
IGT-Version: 1.10-gd36465d (x86_64) (Linux:
4.0.0-rc7_drm-intel-nightly_044307_20150410+ x86_64)
Creating 1536 contexts (assuming of size 4194304)
Creating 3072 surfaces (of size 2797568)
Test requirement not met in function intel_require_memory, file intel_os.c:244:
Test requirement: !(total <= required)
Estimated that we need 8595701760 bytes for the test, but only have 3576692736
bytes available (RAM)
Subtest processes: SKIP (0.092s)
Creating 1536 contexts (assuming of size 4194304)
Creating 6144 surfaces (of size 1048576)
Test requirement not met in function intel_require_memory, file intel_os.c:244:
Test requirement: !(total <= required)
Estimated that we need 6445596672 bytes for the test, but only have 3537895424
bytes available (RAM)
Subtest threads: SKIP (0.065s)

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