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drm/i915: Shrink the request kmem_cache on allocation error

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If we fail to allocate a new request, make sure we recover the pages
that are in the process of being freed by inserting an RCU barrier.

v2: Comment before the shrink and barrier in the error path.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180119144657.22606-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-01-19 14:46:57 +00:00
parent bd724318b6
commit f0111b04ff
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/i915/i915_gem_request.c
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@ -696,6 +696,17 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
if (ret)
goto err_unreserve;
/*
* We've forced the client to stall and catch up with whatever
* backlog there might have been. As we are assuming that we
* caused the mempressure, now is an opportune time to
* recover as much memory from the request pool as is possible.
* Having already penalized the client to stall, we spend
* a little extra time to re-optimise page allocation.
*/
kmem_cache_shrink(dev_priv->requests);
rcu_barrier(); /* Recover the TYPESAFE_BY_RCU pages */
req = kmem_cache_alloc(dev_priv->requests, GFP_KERNEL);
if (!req) {
ret = -ENOMEM;