Limit the GTT size we try and allocate to ensure that it fits within RAM
and does not trigger the oomkiller indiscriminately.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
---
drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 20 ++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index e108fe4e0fd9..600a3bcbd3d6 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -148,7 +148,7 @@ static int igt_ppgtt_alloc(void *arg)
{
struct drm_i915_private *dev_priv = arg;
struct i915_hw_ppgtt *ppgtt;
- u64 size, last;
+ u64 size, last, limit;
int err = 0;
/* Allocate a ppggt and try to fill the entire range */
@@ -163,10 +163,18 @@ static int igt_ppgtt_alloc(void *arg)
if (!ppgtt->vm.allocate_va_range)
goto err_ppgtt_cleanup;
+ /*
+ * While we only allocate the page tables here and so we could
+ * address a much larger GTT than we could actually fit into
+ * RAM, a practical limit is the amount of physical pages in the system.
+ * This should ensure that we do not run into the oomkiller during
+ * the test and take down the machine wilfully.
+ */
+ limit = totalram_pages << PAGE_SHIFT;
+ limit = min(ppgtt->vm.total, limit);
+
/* Check we can allocate the entire range */
- for (size = 4096;
- size <= ppgtt->vm.total;
- size <<= 2) {
+ for (size = 4096; size <= limit; size <<= 2) {
err = ppgtt->vm.allocate_va_range(&ppgtt->vm, 0, size);
if (err) {
if (err == -ENOMEM) {
@@ -183,9 +191,7 @@ static int igt_ppgtt_alloc(void *arg)
}
/* Check we can incrementally allocate the entire range */
- for (last = 0, size = 4096;
- size <= ppgtt->vm.total;
- last = size, size <<= 2) {
+ for (last = 0, size = 4096; size <= limit; last = size, size <<= 2) {
err = ppgtt->vm.allocate_va_range(&ppgtt->vm,
last, size - last);
if (err) {
--
2.18.0
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