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From dd273e3ccebf830d51d03b55b1b6f110e0ff9fb1 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Tue, 14 Nov 2017 22:36:36 -0500
Subject: [PATCH 2854/4131] drm/amdkfd: Fix signal handling performance again
It turns out that idr_for_each_entry is really slow compared to just
iterating over the slots. Based on measurements the difference is
estimated to be about a factor 64. That means using idr_for_each_entry
is only worth it with very few allocated events.
Bug: SWDEV-137662
Change-Id: I1206ad9bf5f8f4437bee49f97c8aab131a2ad201
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_events.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index 9bdea43..1c53601 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -491,7 +491,7 @@ void kfd_signal_event_interrupt(unsigned int pasid, uint32_t partial_id,
pr_debug_ratelimited("Partial ID invalid: %u (%u valid bits)\n",
partial_id, valid_id_bits);
- if (p->signal_event_count < KFD_SIGNAL_EVENT_LIMIT/2) {
+ if (p->signal_event_count < KFD_SIGNAL_EVENT_LIMIT/64) {
/* With relatively few events, it's faster to
* iterate over the event IDR
*/
--
2.7.4
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