mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
drm/i915: Downgrade NEWCLIENT to non-preemptive
Commit1413b2bc07
("drm/i915: Trim NEWCLIENT boosting") had the intended consequence of not allowing a sequence of work that merely crossed into a new engine the privilege to be promoted to NEWCLIENT status. It also had the unintended consequence of actually making NEWCLIENT effective on heavily oversubscribed transcode machines and impacting upon their throughput. If we consider a client packet composed of (rcsA, rcsB, vcs) and 30 of those clients, using the NEWCLIENT boost that will be scheduled as rcsA x 30, (rcsB, vcs) x 30 where as before it would have been (rcsA, rcsB, vcs) x 30 That is with NEWCLIENT only boosting the first request of each client, we would execute all rcsA requests prior to running on the vcs engines; acruing a lot of dead time as compared to the previous case where the vcs engine would be started in parallel to processing the second client. The previous patch has the effect of delaying submission until it is required by a third party (either the user with an explicit wait, or by another client/engine). We reduce the NEWCLIENT bump to a mere WAIT, which has the effect of removing its preemptive grant and reducing it to the same level as any other user interaction -- that it will not be promoted above the interengine dependencies, and so preventing NEWCLIENTS from starving other engines. This a large nerf to the rrul properties of the current NEWCLIENT, but it still does give prioritised submission to new requests from light workloads. References:b16c765122
("drm/i915: Priority boost for new clients") Fixes:1413b2bc07
("drm/i915: Trim NEWCLIENT boosting") # customer impact Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com> Cc: Dmitry Ermilov <dmitry.ermilov@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190515130052.4475-4-chris@chris-wilson.co.uk (cherry picked from commit68fc728b01
) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
parent
9981927cc9
commit
c80274bb58
3 changed files with 4 additions and 5 deletions
|
@ -20,15 +20,14 @@ enum {
|
|||
I915_PRIORITY_INVALID = INT_MIN
|
||||
};
|
||||
|
||||
#define I915_USER_PRIORITY_SHIFT 3
|
||||
#define I915_USER_PRIORITY_SHIFT 2
|
||||
#define I915_USER_PRIORITY(x) ((x) << I915_USER_PRIORITY_SHIFT)
|
||||
|
||||
#define I915_PRIORITY_COUNT BIT(I915_USER_PRIORITY_SHIFT)
|
||||
#define I915_PRIORITY_MASK (I915_PRIORITY_COUNT - 1)
|
||||
|
||||
#define I915_PRIORITY_WAIT ((u8)BIT(0))
|
||||
#define I915_PRIORITY_NEWCLIENT ((u8)BIT(1))
|
||||
#define I915_PRIORITY_NOSEMAPHORE ((u8)BIT(2))
|
||||
#define I915_PRIORITY_NOSEMAPHORE ((u8)BIT(1))
|
||||
|
||||
#define __NO_PREEMPTION (I915_PRIORITY_WAIT)
|
||||
|
||||
|
|
|
@ -1228,7 +1228,7 @@ void i915_request_add(struct i915_request *request)
|
|||
* the bulk clients. (FQ_CODEL)
|
||||
*/
|
||||
if (list_empty(&request->sched.signalers_list))
|
||||
attr.priority |= I915_PRIORITY_NEWCLIENT;
|
||||
attr.priority |= I915_PRIORITY_WAIT;
|
||||
|
||||
engine->schedule(request, &attr);
|
||||
}
|
||||
|
|
|
@ -164,7 +164,7 @@
|
|||
#define WA_TAIL_DWORDS 2
|
||||
#define WA_TAIL_BYTES (sizeof(u32) * WA_TAIL_DWORDS)
|
||||
|
||||
#define ACTIVE_PRIORITY (I915_PRIORITY_NEWCLIENT | I915_PRIORITY_NOSEMAPHORE)
|
||||
#define ACTIVE_PRIORITY (I915_PRIORITY_NOSEMAPHORE)
|
||||
|
||||
static int execlists_context_deferred_alloc(struct intel_context *ce,
|
||||
struct intel_engine_cs *engine);
|
||||
|
|
Loading…
Reference in a new issue