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

[Chris Wilson]

Quoting Michał Winiarski (2019-01-07 12:27:07)
> 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?

They pull in both an i915 and mm purge, which iirc, had to be avoided
here.
-Chris