hi Philippe: > There is no free information in the massif outputs. > massif only produces a sequence of snaphots, each snapshot gives > the memory still allocated at the snapshot time. > > The memory allocated by main returns to 0, because all the memory > allocated by main is freed. The graph effectively shows the absolute > value of the memory allocated at the snapshot time. > massif does not record the free stacktraces, it only records how > much memory is allocated by a stacktrace (and this amount decreases > when free is called). > > So, in summary: > * massif does *not* record 'free' stacktraces > * massif *only* record 'malloc' stacktraces > * massif maintains the memory allocated by a stacktrace > this amount is decreased when free is called. > > So, do not expect to find some details about free stacktraces, as these > are not recorded. Thanks for your kind explination ^^
>
> I think there is a bug in the massif logic to make a peak detailed
> snapshot at the moment of munmap: it should try to produce a peak
> snapshot when releasing the first page of munmap, not when releasing
> the last page.
I use vgdb and try to create snapshop with command, "monitor
detailed_snapshot xxx"
No matter I create snapshop before mmap or after mmap, I hightlight in
the below program, there is still no mmap information in the detail
snapshop file.
It seems the mmap is not recorded by massif even I manual trigger the snapshop.
If I miss anything or do any wrong experiment, please let me know.
appreciate your kind help,
f();
g();
/****break Here*****/
p = mmap (0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
/****break Here*****/
perror ("mmap");
return 1;
}
mmap_snap_0
Description: Binary data
mmap_snap_1
Description: Binary data
mmap_snap_2
Description: Binary data
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
void g(void)
{
int* test1;
test1 = malloc(4000);
}
void f(void)
{
int* test2;
test2 = malloc(2000);
g();
}
int main (int argc, char *argv[])
{
struct stat sb;
off_t len;
char *p;
int fd;
if (argc < 2) {
fprintf (stderr, "usage: %s <file>\n", argv[0]);
return 1;
}
fd = open (argv[1], O_RDONLY);
if (fd == -1) {
perror ("open");
return 1;
}
if (fstat (fd, &sb) == -1) {
perror ("fstat");
return 1;
}
if (!S_ISREG (sb.st_mode)) {
fprintf (stderr, "%s is not a file\n", argv[1]);
return 1;
}
f();
g();
p = mmap (0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
perror ("mmap");
return 1;
}
if (close (fd) == -1) {
perror ("close");
return 1;
}
for (len = 0; len < sb.st_size; len++){
putchar (p[len]);
}
printf("\n");
if (munmap (p, sb.st_size) == -1) {
perror ("munmap");
return 1;
}
return 0;
}
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