[Qemu-devel] [RfC PATCH 07/10] io: add qio_buffer tracing

[Gerd Hoffmann <kraxel@redhat.com>]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 io/buffer.c  | 10 ++++++++++
 trace-events |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/io/buffer.c b/io/buffer.c
index 96077d3..05425c2 100644
--- a/io/buffer.c
+++ b/io/buffer.c
@@ -19,6 +19,7 @@
  */
 
 #include "io/buffer.h"
+#include "trace.h"
 
 #define QIO_BUFFER_MIN_INIT_SIZE 4096
 
@@ -37,6 +38,7 @@ void qio_buffer_reserve(QIOBuffer *buffer, size_t len)
         buffer->capacity = pow2ceil(buffer->offset + len);
         buffer->capacity = MAX(buffer->capacity, QIO_BUFFER_MIN_INIT_SIZE);
         buffer->buffer = g_realloc(buffer->buffer, buffer->capacity);
+        trace_qio_buffer_resize(buffer->name ?: "unnamed", buffer->capacity);
     }
 }
 
@@ -57,6 +59,7 @@ void qio_buffer_reset(QIOBuffer *buffer)
 
 void qio_buffer_free(QIOBuffer *buffer)
 {
+    trace_qio_buffer_free(buffer->name ?: "unnamed");
     g_free(buffer->buffer);
     g_free(buffer->name);
     buffer->offset = 0;
@@ -80,6 +83,9 @@ void qio_buffer_advance(QIOBuffer *buffer, size_t len)
 
 void qio_buffer_move_empty(QIOBuffer *to, QIOBuffer *from)
 {
+    trace_qio_buffer_move_empty(to->name ?: "unnamed",
+                                from->offset,
+                                from->name ?: "unnamed");
     assert(to->offset == 0);
 
     g_free(to->buffer);
@@ -99,6 +105,10 @@ void qio_buffer_move(QIOBuffer *to, QIOBuffer *from)
         return;
     }
 
+    trace_qio_buffer_move(to->name ?: "unnamed",
+                          from->offset,
+                          from->name ?: "unnamed");
+
     qio_buffer_reserve(to, from->offset);
     qio_buffer_append(to, from->buffer, from->offset);
 
diff --git a/trace-events b/trace-events
index 88a2f14..0f06b64 100644
--- a/trace-events
+++ b/trace-events
@@ -1376,6 +1376,12 @@ spapr_iommu_new_table(uint64_t liobn, void *tcet, void *table, int fd) "liobn=%"
 # hw/ppc/ppc.c
 ppc_tb_adjust(uint64_t offs1, uint64_t offs2, int64_t diff, int64_t seconds) "adjusted from 0x%"PRIx64" to 0x%"PRIx64", diff %"PRId64" (%"PRId64"s)"
 
+# io/buffer.c
+qio_buffer_resize(const char *buf, size_t len) "%s: len %zd"
+qio_buffer_move_empty(const char *buf, size_t len, const char *from) "%s: %zd bytes from %s"
+qio_buffer_move(const char *buf, size_t len, const char *from) "%s: %zd bytes from %s"
+qio_buffer_free(const char *buf) "%s"
+
 # util/hbitmap.c
 hbitmap_iter_skip_words(const void *hb, void *hbi, uint64_t pos, unsigned long cur) "hb %p hbi %p pos %"PRId64" cur 0x%lx"
 hbitmap_reset(void *hb, uint64_t start, uint64_t count, uint64_t sbit, uint64_t ebit) "hb %p items %"PRIu64",%"PRIu64" bits %"PRIu64"..%"PRIu64
-- 
1.8.3.1