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From f2b65e424976a876b4fec4de924eb577ddb1e5c6 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Thu, 20 Jun 2019 15:37:37 -0400
Subject: [PATCH 2819/2940] drm/amdkfd: Print a warning when the runlist
becomes oversubscribed
Oversubscription of queues or processes results in poor performance
mostly because HWS blinbly schedules busy and idle queues, resulting
in poor occupancy if many queues are idle.
Let users know with a warning message when transitioning from a
non-oversubscribed to an oversubscribed runlist.
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c | 6 +++++-
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
index c72c8f5fd54c..ccf6b2310316 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_packet_manager.c
@@ -203,11 +203,15 @@ static int pm_create_runlist_ib(struct packet_manager *pm,
pr_debug("Finished map process and queues to runlist\n");
- if (is_over_subscription)
+ if (is_over_subscription) {
+ if (!pm->is_over_subscription)
+ pr_warn("Runlist is getting oversubscribed. Expect reduced ROCm performance.\n");
retval = pm->pmf->runlist(pm, &rl_buffer[rl_wptr],
*rl_gpu_addr,
alloc_size_bytes / sizeof(uint32_t),
true);
+ }
+ pm->is_over_subscription = is_over_subscription;
for (i = 0; i < alloc_size_bytes / sizeof(uint32_t); i++)
pr_debug("0x%2X ", rl_buffer[i]);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index dc6b3eadc65a..a399914782c4 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -1056,6 +1056,7 @@ struct packet_manager {
bool allocated;
struct kfd_mem_obj *ib_buffer_obj;
unsigned int ib_size_bytes;
+ bool is_over_subscription;
const struct packet_manager_funcs *pmf;
};
--
2.17.1
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