Re: [RFC 08/12] drm/i915: Expose per-engine client busyness

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On 10/03/2020 18:32, Chris Wilson wrote:
Quoting Tvrtko Ursulin (2020-03-09 18:31:25)
+static ssize_t
+show_client_busy(struct device *kdev, struct device_attribute *attr, char *buf)
+{
+       struct i915_engine_busy_attribute *i915_attr =
+               container_of(attr, typeof(*i915_attr), attr);
+       unsigned int class = i915_attr->engine_class;
+       struct i915_drm_client *client = i915_attr->client;
+       u64 total = atomic64_read(&client->past_runtime[class]);
+       struct list_head *list = &client->ctx_list;
+       struct i915_gem_context *ctx;
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(ctx, list, client_link) {
+               total += atomic64_read(&ctx->past_runtime[class]);
+               total += pphwsp_busy_add(ctx, class);
+       }
+       rcu_read_unlock();
+
+       total *= RUNTIME_INFO(i915_attr->i915)->cs_timestamp_period_ns;

Planning early retirement? In 600 years, they'll have forgotten how to
email ;)

Shruggety shrug. :) I am guessing you would prefer both internal representations (sw and pphwsp runtimes) to be consistently in nanoseconds? I thought why multiply at various places when once at the readout time is enough.

And I should mention again how I am not sure at the moment how to meld the two stats into one more "perfect" output.

Regards,

Tvrtko
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