[igt-dev] [PATCH i-g-t] tests/gem_shrink: Exercise OOM and other routes to shrinking in reasonable time

[Michał Winiarski]

On Fri, Jan 04, 2019 at 03:37:09PM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> A set of subtests which exercises different paths to our shrinker code
> (including the OOM killer) in predictable and reasonable time budget.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
>  lib/igt_core.c                        |  19 ++
>  lib/igt_core.h                        |   1 +
>  tests/i915/gem_shrink.c               | 399 ++++++++++++++++++++++++++
>  tests/intel-ci/blacklist.txt          |   1 +
>  tests/intel-ci/fast-feedback.testlist |   3 +
>  5 files changed, 423 insertions(+)

[snip]

> diff --git a/tests/i915/gem_shrink.c b/tests/i915/gem_shrink.c
> index c8e05814ee70..7c002de0ef1f 100644
> --- a/tests/i915/gem_shrink.c
> +++ b/tests/i915/gem_shrink.c
> @@ -26,6 +26,10 @@
>   *
>   * Exercise the shrinker by overallocating GEM objects
>   */
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <sys/wait.h>
> +#include <fcntl.h>
>  
>  #include "igt.h"
>  #include "igt_gt.h"
> @@ -366,6 +370,376 @@ static void reclaim(unsigned engine, int timeout)
>  	close(fd);
>  }
>  
> +static unsigned long get_meminfo(const char *info, const char *tag)
> +{
> +	const char *str;
> +	unsigned long val;
> +
> +	str = strstr(info, tag);
> +	if (str && sscanf(str + strlen(tag), " %lu", &val) == 1)
> +		return val >> 10;
> +
> +	igt_warn("Unrecognised /proc/meminfo field: '%s'\n", tag);
> +	return 0;
> +}
> +
> +static unsigned long get_avail_ram_mb(void)
> +{
> +	int fd;
> +	int ret;
> +	char buf[4096];
> +	unsigned long ram;
> +
> +	fd = open("/proc/meminfo", O_RDONLY);
> +	igt_assert_fd(fd);
> +
> +	ret = read(fd, buf, sizeof(buf));
> +	igt_assert(ret >= 0);
> +
> +	close(fd);
> +
> +	ram = get_meminfo(buf, "MemAvailable:");
> +	ram += get_meminfo(buf, "Buffers:");
> +	ram += get_meminfo(buf, "Cached:");
> +	ram += get_meminfo(buf, "SwapCached:");
> +
> +	return ram;
> +}

What's wrong with ones from intel_os.c?

-Michał