On 18/03/2020 13:55, Chris Wilson wrote:
Quoting Tvrtko Ursulin (2020-03-18 12:11:34)
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
As contexts are abandoned we want to remember how much GPU time they used
(per class) so later we can used it for smarter purposes.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 13 ++++++++++++-
drivers/gpu/drm/i915/gem/i915_gem_context_types.h | 5 +++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 7c119a3a2cbd..5edf79ed6247 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -257,7 +257,19 @@ static void free_engines_rcu(struct rcu_head *rcu)
{
struct i915_gem_engines *engines =
container_of(rcu, struct i915_gem_engines, rcu);
+ struct i915_gem_context *ctx = engines->ctx;
+ struct i915_gem_engines_iter it;
+ struct intel_context *ce;
+
+ /* Transfer accumulated runtime to the parent GEM context. */
+ for_each_gem_engine(ce, engines, it) {
+ unsigned int class = ce->engine->uabi_class;
+ GEM_BUG_ON(class >= ARRAY_SIZE(ctx->past_runtime));
+ atomic64_add(ce->runtime.total, &ctx->past_runtime[class]);
Hmm, there's an odd situation where the free_engines_rcu could fire
before we do the final schedule_out of the context.
GEM_BUG_ON(intel_context_inflight(ce)) to see if that's being too
paranoid.
Deja vu.. have I forgotten to move this into intel_context_free while
the purpose of keeping ce->gem_context valid was exactly to enable that.
Regards,
Tvrtko
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