Re: [igt-dev] [PATCH i-g-t 1/1] intel-gpu-top: Support for client stats

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On 07/09/2020 10:31, Petri Latvala wrote:
On Fri, Sep 04, 2020 at 02:06:07PM +0100, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Adds support for per-client engine busyness stats i915 exports in sysfs
and produces output like the below:

==========================================================================
intel-gpu-top -  935/ 935 MHz;    0% RC6; 14.73 Watts;     1097 irqs/s

       IMC reads:     1401 MiB/s
      IMC writes:        4 MiB/s

           ENGINE      BUSY                                 MI_SEMA MI_WAIT
      Render/3D/0   63.73% |███████████████████           |      3%      0%
        Blitter/0    9.53% |██▊                           |      6%      0%
          Video/0   39.32% |███████████▊                  |     16%      0%
          Video/1   15.62% |████▋                         |      0%      0%
   VideoEnhance/0    0.00% |                              |      0%      0%

   PID            NAME     RCS          BCS          VCS         VECS
  4084        gem_wsim |█████▌     ||█          ||           ||           |
  4086        gem_wsim |█▌         ||           ||███        ||           |
==========================================================================

Apart from the existing physical engine utilization it now also shows
utilization per client and per engine class.

v2:
  * Version to match removal of global enable_stats toggle.
  * Plus various fixes.

v3:
  * Support brief backward jumps in client stats.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
  tools/intel_gpu_top.c | 539 +++++++++++++++++++++++++++++++++++++++++-
  1 file changed, 528 insertions(+), 11 deletions(-)

diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index cae01c25b920..9eac569e75de 100644
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -679,23 +679,347 @@ static void pmu_sample(struct engines *engines)
  	}
  }
+enum client_status {
+	FREE = 0, /* mbz */
+	ALIVE,
+	PROBE
+};
+
+struct clients;
+
+struct client {
+	struct clients *clients;
+
+	enum client_status status;
+	unsigned int id;
+	unsigned int pid;
+	char name[128];
+	unsigned int samples;
+	unsigned long total;
+	struct engines *engines;
+	unsigned long *val;
+	uint64_t *last;
+};
+
+struct engine_class {
+	unsigned int class;
+	const char *name;
+	unsigned int num_engines;
+};
+
+struct clients {
+	unsigned int num_classes;
+	struct engine_class *class;
+
+	unsigned int num_clients;
+	struct client *client;
+};
+
+#define for_each_client(clients, c, tmp) \
+	for ((tmp) = (clients)->num_clients, c = (clients)->client; \
+	     (tmp > 0); (tmp)--, (c)++)
+
+static struct clients *init_clients(void)
+{
+	struct clients *clients = malloc(sizeof(*clients));
+
+	return memset(clients, 0, sizeof(*clients));
+}
+
+#define SYSFS_CLIENTS "/sys/class/drm/card0/clients"

Now that intel_gpu_top supports device selection, this path works
every time only 60% of the time, right?

Gah yes.. thanks. I cherry picked from the wrong branch. I did already have this updated for device selection, somewhere. Will find it.

Regards,

Tvrtko
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