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authorGerd Hoffmann <kraxel@redhat.com>2015-10-30 12:10:01 +0100
committerGerd Hoffmann <kraxel@redhat.com>2015-11-05 09:08:48 +0100
commitd2b90718d25ed6dc8a2bb7f06504e6500dcc7bae (patch)
tree2d047ed544d2c4f3cac05a4a16f40098e7bfff1b
parent1ff36b5d4d00a4e3633eb960bf2be562f5e47dbf (diff)
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buffer: add tracing
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Peter Lieven <pl@kamp.de> Reviewed-by: Daniel P. Berrange <berrange@redhat.com> Message-id: 1446203414-4013-7-git-send-email-kraxel@redhat.com
-rw-r--r--trace-events6
-rw-r--r--util/buffer.c18
2 files changed, 24 insertions, 0 deletions
diff --git a/trace-events b/trace-events
index 72136b9..e67ad81 100644
--- a/trace-events
+++ b/trace-events
@@ -1387,6 +1387,12 @@ ppc_tb_adjust(uint64_t offs1, uint64_t offs2, int64_t diff, int64_t seconds) "ad
prep_io_800_writeb(uint32_t addr, uint32_t val) "0x%08" PRIx32 " => 0x%02" PRIx32
prep_io_800_readb(uint32_t addr, uint32_t retval) "0x%08" PRIx32 " <= 0x%02" PRIx32
+# io/buffer.c
+buffer_resize(const char *buf, size_t olen, size_t len) "%s: old %zd, new %zd"
+buffer_move_empty(const char *buf, size_t len, const char *from) "%s: %zd bytes from %s"
+buffer_move(const char *buf, size_t len, const char *from) "%s: %zd bytes from %s"
+buffer_free(const char *buf, size_t len) "%s: capacity %zd"
+
# 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
diff --git a/util/buffer.c b/util/buffer.c
index 234e33d..ae2907e 100644
--- a/util/buffer.c
+++ b/util/buffer.c
@@ -19,6 +19,7 @@
*/
#include "qemu/buffer.h"
+#include "trace.h"
#define BUFFER_MIN_INIT_SIZE 4096
#define BUFFER_MIN_SHRINK_SIZE 65536
@@ -34,6 +35,8 @@ void buffer_init(Buffer *buffer, const char *name, ...)
void buffer_shrink(Buffer *buffer)
{
+ size_t old;
+
/*
* Only shrink in case the used size is *much* smaller than the
* capacity, to avoid bumping up & down the buffers all the time.
@@ -44,17 +47,25 @@ void buffer_shrink(Buffer *buffer)
return;
}
+ old = buffer->capacity;
buffer->capacity = pow2ceil(buffer->offset);
buffer->capacity = MAX(buffer->capacity, BUFFER_MIN_SHRINK_SIZE);
buffer->buffer = g_realloc(buffer->buffer, buffer->capacity);
+ trace_buffer_resize(buffer->name ?: "unnamed",
+ old, buffer->capacity);
}
void buffer_reserve(Buffer *buffer, size_t len)
{
+ size_t old;
+
if ((buffer->capacity - buffer->offset) < len) {
+ old = buffer->capacity;
buffer->capacity = pow2ceil(buffer->offset + len);
buffer->capacity = MAX(buffer->capacity, BUFFER_MIN_INIT_SIZE);
buffer->buffer = g_realloc(buffer->buffer, buffer->capacity);
+ trace_buffer_resize(buffer->name ?: "unnamed",
+ old, buffer->capacity);
}
}
@@ -75,6 +86,7 @@ void buffer_reset(Buffer *buffer)
void buffer_free(Buffer *buffer)
{
+ trace_buffer_free(buffer->name ?: "unnamed", buffer->capacity);
g_free(buffer->buffer);
g_free(buffer->name);
buffer->offset = 0;
@@ -98,6 +110,9 @@ void buffer_advance(Buffer *buffer, size_t len)
void buffer_move_empty(Buffer *to, Buffer *from)
{
+ trace_buffer_move_empty(to->name ?: "unnamed",
+ from->offset,
+ from->name ?: "unnamed");
assert(to->offset == 0);
g_free(to->buffer);
@@ -117,6 +132,9 @@ void buffer_move(Buffer *to, Buffer *from)
return;
}
+ trace_buffer_move(to->name ?: "unnamed",
+ from->offset,
+ from->name ?: "unnamed");
buffer_reserve(to, from->offset);
buffer_append(to, from->buffer, from->offset);