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8146683: check_addr0 should be more efficient

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Reviewed-by: dsamersoff, kevinw, dholmes
This commit is contained in:
Cheleswer Sahu 2016-03-08 14:37:43 +05:30 • committed by Cheleswer Sahu
parent b7486d2544
commit ca8482e568
1 changed files with 32 additions and 13 deletions
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37
hotspot/src/os/solaris/vm/os_solaris.cpp
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@ -1892,23 +1892,42 @@ void os::Solaris::print_libversion_info(outputStream* st) {
static bool check_addr0(outputStream* st) { static bool check_addr0(outputStream* st) {
jboolean status = false; jboolean status = false;
const int read_chunk = 200;
int ret = 0;
int nmap = 0;
int fd = ::open("/proc/self/map",O_RDONLY); int fd = ::open("/proc/self/map",O_RDONLY);
if (fd >= 0) { if (fd >= 0) {
prmap_t p; prmap_t *p = NULL;
while (::read(fd, &p, sizeof(p)) > 0) { char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t) + 1);
if (p.pr_vaddr == 0x0) { if (NULL == mbuff) {
st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); ::close(fd);
st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); return status;
}
while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) {
//check if read() has not read partial data
if( 0 != ret % sizeof(prmap_t)){
break;
}
nmap = ret / sizeof(prmap_t);
p = (prmap_t *)mbuff;
for(int i = 0; i < nmap; i++){
if (p->pr_vaddr == 0x0) {
st->print("Warning: Address: " PTR_FORMAT ", Size: %dK, ",p->pr_vaddr, p->pr_size/1024);
st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname);
st->print("Access: "); st->print("Access: ");
st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-");
st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-");
st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-");
st->cr(); st->cr();
status = true; status = true;
} }
p = (prmap_t *)(mbuff + sizeof(prmap_t));
}
memset(mbuff, 0, read_chunk*sizeof(prmap_t)+1);
}
free(mbuff);
} }
::close(fd); ::close(fd);
}
return status; return status;
} }