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Bug 717861 GetVsize and GetResident underestimate memory size on Solaris r=justin.lebar

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This commit is contained in:
Ginn Chen 2012-01-31 14:32:10 +08:00
parent bd330a1bcb
commit 6278f45019
1 changed files with 28 additions and 13 deletions
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41
xpcom/base/nsMemoryReporterManager.cpp
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@ -145,21 +145,38 @@ static PRInt64 GetResident()
static void XMappingIter(PRInt64& Vsize, PRInt64& Resident)
{
Vsize = -1;
Resident = -1;
int mapfd = open("/proc/self/xmap", O_RDONLY);
struct stat st;
prxmap_t *prmapp;
prxmap_t *prmapp = NULL;
if (mapfd >= 0) {
if (!fstat(mapfd, &st)) {
int nmap = st.st_size / sizeof(prxmap_t);
prmapp = (prxmap_t*)malloc((nmap + 1) * sizeof(prxmap_t));
int n = read(mapfd, prmapp, (nmap + 1) * sizeof(prxmap_t));
if (n > 0) {
Vsize = 0;
Resident = 0;
for (int i = 0; i < n / sizeof(prxmap_t); i++) {
Vsize += prmapp[i].pr_size;
Resident += prmapp[i].pr_rss * prmapp[i].pr_pagesize;
while (1) {
// stat(2) on /proc/<pid>/xmap returns an incorrect value,
// prior to the release of Solaris 11.
// Here is a workaround for it.
nmap *= 2;
prmapp = (prxmap_t*)malloc((nmap + 1) * sizeof(prxmap_t));
if (!prmapp) {
// out of memory
break;
}
int n = pread(mapfd, prmapp, (nmap + 1) * sizeof(prxmap_t), 0);
if (n < 0) {
break;
}
if (nmap >= n / sizeof (prxmap_t)) {
Vsize = 0;
Resident = 0;
for (int i = 0; i < n / sizeof (prxmap_t); i++) {
Vsize += prmapp[i].pr_size;
Resident += prmapp[i].pr_rss * prmapp[i].pr_pagesize;
}
break;
}
free(prmapp);
}
free(prmapp);
}
@ -169,16 +186,14 @@ static void XMappingIter(PRInt64& Vsize, PRInt64& Resident)
static PRInt64 GetVsize()
{
PRInt64 Vsize = -1;
PRInt64 Resident = -1;
PRInt64 Vsize, Resident;
XMappingIter(Vsize, Resident);
return Vsize;
}
static PRInt64 GetResident()
{
PRInt64 Vsize = -1;
PRInt64 Resident = -1;
PRInt64 Vsize, Resident;
XMappingIter(Vsize, Resident);
return Resident;
}