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6541756: Reduce executable C-heap

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Add executable parameters to reserve_memory and commit_memory to reduce executable memory to only the Code Heap.

Reviewed-by: xlu, kvn, acorn
This commit is contained in:
Coleen Phillimore 2009-03-25 14:19:20 -04:00
parent 472349069b
commit cec3a034d1
7 changed files with 122 additions and 58 deletions
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15
hotspot/src/os/solaris/vm/os_solaris.cpp
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@ -2623,15 +2623,16 @@ int os::vm_allocation_granularity() {
return page_size;
}
bool os::commit_memory(char* addr, size_t bytes) {
bool os::commit_memory(char* addr, size_t bytes, bool exec) {
int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE;
size_t size = bytes;
return
NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED,
PROT_READ | PROT_WRITE | PROT_EXEC);
NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot);
}
bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint) {
if (commit_memory(addr, bytes)) {
bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint,
bool exec) {
if (commit_memory(addr, bytes, exec)) {
if (UseMPSS && alignment_hint > (size_t)vm_page_size()) {
// If the large page size has been set and the VM
// is using large pages, use the large page size
@ -3220,7 +3221,9 @@ bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) {
return true;
}
char* os::reserve_memory_special(size_t bytes, char* addr) {
char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) {
// "exec" is passed in but not used. Creating the shared image for
// the code cache doesn't have an SHM_X executable permission to check.
assert(UseLargePages && UseISM, "only for ISM large pages");
size_t size = bytes;