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gem_tiled_swapping: Purge all page/swap caches first

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Reset the system to a vanilla state before we query how much RAM/swap
space is available for our testing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-04-07 13:09:46 +01:00
parent 5d607a744f
commit ff7806e52c
3 changed files with 15 additions and 0 deletions
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1
lib/igt_aux.h
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@ -61,6 +61,7 @@ void igt_wait_for_keypress(void);
/* These are separate to allow easier testing when porting, see the comment at /* These are separate to allow easier testing when porting, see the comment at
* the bottom of intel_os.c. */ * the bottom of intel_os.c. */
void intel_purge_vm_caches(void);
uint64_t intel_get_avail_ram_mb(void); uint64_t intel_get_avail_ram_mb(void);
uint64_t intel_get_total_ram_mb(void); uint64_t intel_get_total_ram_mb(void);
uint64_t intel_get_total_swap_mb(void); uint64_t intel_get_total_swap_mb(void);

13
lib/intel_os.c
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@ -185,6 +185,19 @@ intel_get_total_swap_mb(void)
return retval / (1024*1024); return retval / (1024*1024);
} }
void
intel_purge_vm_caches(void)
{
int fd;
fd = open("/proc/sys/vm/drop_caches", O_RDWR);
if (fd < 0)
return;
write(fd, "3\n", 2);
close(fd);
}
/* /*
* When testing a port to a new platform, create a standalone test binary * When testing a port to a new platform, create a standalone test binary

1
tests/gem_tiled_swapping.c
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@ -102,6 +102,7 @@ igt_simple_main
current_tiling_mode = I915_TILING_X; current_tiling_mode = I915_TILING_X;
igt_skip_on_simulation(); igt_skip_on_simulation();
intel_purge_vm_caches();
fd = drm_open_any(); fd = drm_open_any();
/* need slightly more than available memory */ /* need slightly more than available memory */