linux-kernel - [PATCH v2] tracing/gpu: Add imported size to gpu_mem

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Date:   Tue, 17 Aug 2021 18:52:52 +0000
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     surenb@...gle.com, hridya@...gle.com, gregkh@...uxfoundation.org,
        john.reitan@....com, orjan.eide@....com, mark.underwood@....com,
        gary.sweet@...adcom.com, stephen.mansfield@...tec.com,
        kernel-team@...roid.com, Kalesh Singh <kaleshsingh@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2] tracing/gpu: Add imported size to gpu_mem_imported tracepoint

The existing gpu_mem_total tracepoint provides GPU drivers a uniform way
to report the per-process and system-wide GPU memory usage. This
tracepoint reports a single total of the GPU private allocations and the
imported memory. [1]

To allow distinguishing GPU private vs imported memory, add an
imported_size field to the gpu_mem_total tracepoint. GPU drivers can use
this new field to report the per-process and global GPU-imported memory
in a uniform way.

User space tools can detect and handle the old vs new gpu_mem_total
format via the gpu_mem/gpu_mem_total/format file.

[1] https://lore.kernel.org/r/20200302234840.57188-1-zzyiwei@google.com/

Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
---
Changes in v2:
  - Add imported_size field to track imported memory instead of a
    separate tracepoint, per Ørjan

v1 of this patch can be found at:
https://lore.kernel.org/r/20210726164135.1745059-1-kaleshsingh@google.com/

 include/trace/events/gpu_mem.h | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/gpu_mem.h b/include/trace/events/gpu_mem.h
index 26d871f96e94..ae6fab6bab7b 100644
--- a/include/trace/events/gpu_mem.h
+++ b/include/trace/events/gpu_mem.h
@@ -15,7 +15,7 @@
 
 /*
  * The gpu_memory_total event indicates that there's an update to either the
- * global or process total gpu memory counters.
+ * global or process total and imported gpu memory counters.
  *
  * This event should be emitted whenever the kernel device driver allocates,
  * frees, imports, unimports memory in the GPU addressable space.
@@ -24,31 +24,36 @@
  *
  * @pid: Put 0 for global total, while positive pid for process total.
  *
- * @size: Size of the allocation in bytes.
+ * @size: Total size of allocated and imported memory in bytes.
+ *
+ * @imported_size: Total size of imported memory in bytes.
  *
  */
 TRACE_EVENT(gpu_mem_total,
 
-	TP_PROTO(uint32_t gpu_id, uint32_t pid, uint64_t size),
+	TP_PROTO(uint32_t gpu_id, uint32_t pid, uint64_t size, uint64_t imported_size),
 
-	TP_ARGS(gpu_id, pid, size),
+	TP_ARGS(gpu_id, pid, size, imported_size),
 
 	TP_STRUCT__entry(
 		__field(uint32_t, gpu_id)
 		__field(uint32_t, pid)
 		__field(uint64_t, size)
+		__field(uint64_t, imported_size)
 	),
 
 	TP_fast_assign(
 		__entry->gpu_id = gpu_id;
 		__entry->pid = pid;
 		__entry->size = size;
+		__entry->imported_size = imported_size;
 	),
 
-	TP_printk("gpu_id=%u pid=%u size=%llu",
+	TP_printk("gpu_id=%u pid=%u size=%llu imported_size=%llu",
 		__entry->gpu_id,
 		__entry->pid,
-		__entry->size)
+		__entry->size,
+		__entry->imported_size)
 );
 
 #endif /* _TRACE_GPU_MEM_H */

base-commit: a2824f19e6065a0d3735acd9fe7155b104e7edf5
-- 
2.33.0.rc1.237.g0d66db33f3-goog