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gpu: nvgpu: gk20a: Add a gpfifo wait trace point

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Add a couple of trace points for tracking when we need to wait for
space in the gpfifo ring buffer.  This wait can introduce significant
latencies to rendering with large gpfifo entry inputs so it's good to
be able to measure how often this path is taken.

Bug 1592391
Bug 1550886

Change-Id: I7f362e9c307eeffeeecaaba268ef2e3613e54597
Signed-off-by: Janne Hellsten <jhellsten@nvidia.com>
Reviewed-on: http://git-master/r/674021
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Janne Hellsten
2015-01-20 17:21:06 +02:00
committed by Dan Willemsen
parent f11443daff
commit f6587d13e4
2 changed files with 12 additions and 0 deletions
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2
drivers/gpu/nvgpu/gk20a/channel_gk20a.c
View File

@@ -1572,9 +1572,11 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
/* Make sure we have enough space for gpfifo entries. If not, /* Make sure we have enough space for gpfifo entries. If not,
* wait for signals from completed submits */ * wait for signals from completed submits */
if (gp_free_count(c) < num_entries + extra_entries) { if (gp_free_count(c) < num_entries + extra_entries) {
trace_gk20a_gpfifo_submit_wait_for_space(c->g->dev->name);
err = wait_event_interruptible(c->submit_wq, err = wait_event_interruptible(c->submit_wq,
get_gp_free_count(c) >= num_entries + extra_entries || get_gp_free_count(c) >= num_entries + extra_entries ||
c->has_timedout); c->has_timedout);
trace_gk20a_gpfifo_submit_wait_for_space_done(c->g->dev->name);
} }
if (c->has_timedout) { if (c->has_timedout) {

10
include/trace/events/gk20a.h
View File

@@ -55,6 +55,16 @@ DEFINE_EVENT(gk20a, gk20a_finalize_poweron_done,
TP_ARGS(name) TP_ARGS(name)
); );
DEFINE_EVENT(gk20a, gk20a_gpfifo_submit_wait_for_space,
TP_PROTO(const char *name),
TP_ARGS(name)
);
DEFINE_EVENT(gk20a, gk20a_gpfifo_submit_wait_for_space_done,
TP_PROTO(const char *name),
TP_ARGS(name)
);
TRACE_EVENT(gk20a_channel_update, TRACE_EVENT(gk20a_channel_update,
TP_PROTO(const void *channel), TP_PROTO(const void *channel),
TP_ARGS(channel), TP_ARGS(channel),