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lib: add a function to lock memory into RAM

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Add a function to lock memory into RAM and use it in the
gem_tiled_swapping test to reduce the amount of allocated memory
required to force swapping. This also reduces the amount of time
required for the test to complete, since the data set is smaller.

The following durations were recorded with gem_tiled_swapping on a
haswell system before the change:

  Subtest non-threaded: SUCCESS (55.889s)
  Subtest threaded: SUCCESS (810.532s)

and after:

  Subtest non-threaded: SUCCESS (11.804s)
  Subtest threaded: SUCCESS (268.336s)

v2: add various assertions and requirements and make sure
    gem_tiled_swapping works on systems with less RAM (Daniel Vetter)

v3: fix allocation size calculation

Signed-off-by: Thomas Wood <thomas.wood@intel.com>
This commit is contained in:
Thomas Wood
2014-12-08 11:12:51 +00:00
parent 5fe9c88bda
commit 42b02c284e
3 changed files with 70 additions and 1 deletions
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tests/gem_tiled_swapping.c
+9 -1
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@@ -70,6 +70,7 @@ IGT_TEST_DESCRIPTION("Exercise swizzle code for swapping.");
static uint32_t current_tiling_mode;
#define PAGE_SIZE 4096
#define AVAIL_RAM 512
static uint32_t
create_bo_and_fill(int fd)
@@ -151,13 +152,20 @@ igt_main
int fd, n, count, num_threads;
igt_fixture {
size_t lock_size;
current_tiling_mode = I915_TILING_X;
intel_purge_vm_caches();
fd = drm_open_any();
/* lock RAM, leaving only 512MB available */
lock_size = max(0, intel_get_total_ram_mb() - AVAIL_RAM);
igt_lock_mem(lock_size);
/* need slightly more than available memory */
count = intel_get_total_ram_mb() + intel_get_total_swap_mb() / 4;
count = min(intel_get_total_ram_mb(), AVAIL_RAM) * 1.25;
bo_handles = calloc(count, sizeof(uint32_t));
igt_assert(bo_handles);