trace: Trace qemu_malloc() and qemu_vmalloc()

It is often useful to instrument memory management functions in order to
find leaks or performance problems.  This patch adds trace events for
the memory allocation primitives.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
This commit is contained in:
Stefan Hajnoczi 2010-05-22 18:09:25 +01:00 committed by Anthony Liguori
parent 81a97d9d97
commit cd245a1932
3 changed files with 38 additions and 8 deletions

24
osdep.c
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@ -50,6 +50,7 @@
#endif
#include "qemu-common.h"
#include "trace.h"
#include "sysemu.h"
#include "qemu_socket.h"
@ -71,25 +72,34 @@ static void *oom_check(void *ptr)
#if defined(_WIN32)
void *qemu_memalign(size_t alignment, size_t size)
{
void *ptr;
if (!size) {
abort();
}
return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
ptr = oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
trace_qemu_memalign(alignment, size, ptr);
return ptr;
}
void *qemu_vmalloc(size_t size)
{
void *ptr;
/* FIXME: this is not exactly optimal solution since VirtualAlloc
has 64Kb granularity, but at least it guarantees us that the
memory is page aligned. */
if (!size) {
abort();
}
return oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
ptr = oom_check(VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE));
trace_qemu_vmalloc(size, ptr);
return ptr;
}
void qemu_vfree(void *ptr)
{
trace_qemu_vfree(ptr);
VirtualFree(ptr, 0, MEM_RELEASE);
}
@ -97,21 +107,22 @@ void qemu_vfree(void *ptr)
void *qemu_memalign(size_t alignment, size_t size)
{
void *ptr;
#if defined(_POSIX_C_SOURCE) && !defined(__sun__)
int ret;
void *ptr;
ret = posix_memalign(&ptr, alignment, size);
if (ret != 0) {
fprintf(stderr, "Failed to allocate %zu B: %s\n",
size, strerror(ret));
abort();
}
return ptr;
#elif defined(CONFIG_BSD)
return oom_check(valloc(size));
ptr = oom_check(valloc(size));
#else
return oom_check(memalign(alignment, size));
ptr = oom_check(memalign(alignment, size));
#endif
trace_qemu_memalign(alignment, size, ptr);
return ptr;
}
/* alloc shared memory pages */
@ -122,6 +133,7 @@ void *qemu_vmalloc(size_t size)
void qemu_vfree(void *ptr)
{
trace_qemu_vfree(ptr);
free(ptr);
}

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@ -22,6 +22,7 @@
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "trace.h"
#include <stdlib.h>
static void *oom_check(void *ptr)
@ -34,6 +35,7 @@ static void *oom_check(void *ptr)
void qemu_free(void *ptr)
{
trace_qemu_free(ptr);
free(ptr);
}
@ -48,18 +50,24 @@ static int allow_zero_malloc(void)
void *qemu_malloc(size_t size)
{
void *ptr;
if (!size && !allow_zero_malloc()) {
abort();
}
return oom_check(malloc(size ? size : 1));
ptr = oom_check(malloc(size ? size : 1));
trace_qemu_malloc(size, ptr);
return ptr;
}
void *qemu_realloc(void *ptr, size_t size)
{
void *newptr;
if (!size && !allow_zero_malloc()) {
abort();
}
return oom_check(realloc(ptr, size ? size : 1));
newptr = oom_check(realloc(ptr, size ? size : 1));
trace_qemu_realloc(ptr, size, newptr);
return newptr;
}
void *qemu_mallocz(size_t size)

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@ -27,3 +27,13 @@
# system may not have the necessary headers included.
#
# The <format-string> should be a sprintf()-compatible format string.
# qemu-malloc.c
disable qemu_malloc(size_t size, void *ptr) "size %zu ptr %p"
disable qemu_realloc(void *ptr, size_t size, void *newptr) "ptr %p size %zu newptr %p"
disable qemu_free(void *ptr) "ptr %p"
# osdep.c
disable qemu_memalign(size_t alignment, size_t size, void *ptr) "alignment %zu size %zu ptr %p"
disable qemu_valloc(size_t size, void *ptr) "size %zu ptr %p"
disable qemu_vfree(void *ptr) "ptr %p"