[igt-dev] [PATCH i-g-t] i915/gem_mmap_gtt: Replace forked-mmaped tests with a lighter variant

[Mika Kuoppala]

Mika Kuoppala <mika.kuoppala at linux.intel.com> writes:

> Chris Wilson <chris at chris-wilson.co.uk> writes:
>
>> Introduce a new 2-process fork test that is bound to a single cpu to
>> exercise contention during pagefaults. This is a much lighter variant of
>> the all-cpus test intended to be viable even on the legendary frozen
>> lakes of molasses.
>>
>> References: https://bugs.freedesktop.org/show_bug.cgi?id=110882
>> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
>> Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
>> Cc: Martin Peres <martin.peres at linux.intel.com>
>> ---
>>  tests/i915/gem_mmap_gtt.c    | 36 +++++++++++++++++++++++++-----------
>>  tests/intel-ci/blacklist.txt |  2 +-
>>  2 files changed, 26 insertions(+), 12 deletions(-)
>>
>> diff --git a/tests/i915/gem_mmap_gtt.c b/tests/i915/gem_mmap_gtt.c
>> index ac439cdf8..0428a1372 100644
>> --- a/tests/i915/gem_mmap_gtt.c
>> +++ b/tests/i915/gem_mmap_gtt.c
>> @@ -792,9 +792,6 @@ test_huge_copy(int fd, int huge, int tiling_a, int tiling_b, int ncpus)
>>  	uint64_t huge_object_size, i;
>>  	unsigned mode = CHECK_RAM;
>>  
>> -	igt_fail_on_f(intel_gen(devid) >= 11 && ncpus > 1,
>> -		      "Please adjust your expectations, https://bugs.freedesktop.org/show_bug.cgi?id=110882\n");
>> -
>>  	switch (huge) {
>>  	case -2:
>>  		huge_object_size = gem_mappable_aperture_size() / 4;
>> @@ -1138,17 +1135,34 @@ igt_main
>>  			for (const struct copy_mode *m = copy_modes; m->suffix; m++) {
>>  				igt_subtest_f("%s-copy%s", s->prefix, m->suffix)
>>  					test_huge_copy(fd,
>> -							s->size,
>> -							m->tiling_x,
>> -							m->tiling_y,
>> -							1);
>> +						       s->size,
>> +						       m->tiling_x,
>> +						       m->tiling_y,
>> +						       1);
>> +
>> +				igt_subtest_f("cpuset-%s-copy%s", s->prefix, m->suffix) {
>> +					cpu_set_t cpu, old;
>> +
>> +					sched_getaffinity(0, sizeof(old), &old);
>> +
>> +					CPU_ZERO(&cpu);
>> +					CPU_SET(0, &cpu);
>> +					igt_assert(sched_setaffinity(0, sizeof(cpu), &cpu) == 0);
>> +					test_huge_copy(fd,
>> +						       s->size,
>> +						       m->tiling_x,
>> +						       m->tiling_y,
>> +						       2);
>> +
>> +					igt_assert(sched_setaffinity(0, sizeof(old), &old) == 0);
>> +				}
>>  
>>  				igt_subtest_f("forked-%s-copy%s", s->prefix, m->suffix)
>>  					test_huge_copy(fd,
>> -							s->size,
>> -							m->tiling_x,
>> -							m->tiling_y,
>> -							ncpus);
>> +						       s->size,
>> +						       m->tiling_x,
>> +						       m->tiling_y,
>> +						       ncpus);
>>  			}
>>  	}
>>  
>> diff --git a/tests/intel-ci/blacklist.txt b/tests/intel-ci/blacklist.txt
>> index 8e3dafa98..5fa91105f 100644
>> --- a/tests/intel-ci/blacklist.txt
>> +++ b/tests/intel-ci/blacklist.txt
>> @@ -47,7 +47,7 @@ igt at gem_gtt_hog(@.*)?
>>  igt at gem_gtt_speed(@.*)?
>>  igt at gem_hangcheck_forcewake(@.*)?
>>  igt at gem_lut_handle(@.*)?
>> -igt at gem_mmap_gtt@.*(huge|swap|clflush).*
>> +igt at gem_mmap_gtt@.*(huge|swap|clflush|forked).*
>
> Dunno if this is enough for bat to pick it up. Regardless,
> patch does what it says, using 2 threads on single cpu.
>
> It should fly, even with maps of molasses.

Subtest cpuset-basic-small-copy: SUCCESS (2,965s)

Subtest cpuset-basic-small-copy-XY: SUCCESS (4,457s)
Subtest cpuset-big-copy-XY: SUCCESS (17,738s)
Subtest cpuset-medium-copy-XY: SUCCESS (8,871s)

-Mika

>
> Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
>
>>  igt at gem_mmap@.*(swap|huge).*
>>  igt at gem_mocs_settings@.*(suspend|hibernate).*
>>  igt at gem_pin(@.*)?
>> -- 
>> 2.23.0