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drm/i915: Ratelimit request allocation under oom

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If we fail to allocate a request, we can reap the outstanding requests
and push them to the request's slab's freelist before trying again. This
forces us to ratelimit malicious clients that tie up all of the system
resources in requests, instead of causing a system-wide oom.

Testcase: igt/gem_shrink/execbuf1
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171212180652.22061-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-12-12 18:06:52 +00:00
parent 2abe2f8446
commit 31c70f97be
1 changed files with 15 additions and 4 deletions
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19
drivers/gpu/drm/i915/i915_gem_request.c
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@ -677,10 +677,21 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
*
* Do not use kmem_cache_zalloc() here!
*/
req = kmem_cache_alloc(dev_priv->requests, GFP_KERNEL);
if (!req) {
ret = -ENOMEM;
goto err_unreserve;
req = kmem_cache_alloc(dev_priv->requests,
GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
if (unlikely(!req)) {
/* Ratelimit ourselves to prevent oom from malicious clients */
ret = i915_gem_wait_for_idle(dev_priv,
I915_WAIT_LOCKED |
I915_WAIT_INTERRUPTIBLE);
if (ret)
goto err_unreserve;
req = kmem_cache_alloc(dev_priv->requests, GFP_KERNEL);
if (!req) {
ret = -ENOMEM;
goto err_unreserve;
}
}
req->timeline = i915_gem_context_lookup_timeline(ctx, engine);