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8157952: Parallelize Memory Pretouch

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Use multiple threads to pretouch memory using -XX:+AlwaysPreTouch to use more memory bandwidth

Reviewed-by: jmasa, sangheki
This commit is contained in:
Thomas Schatzl 2016-09-16 11:33:47 +02:00
parent b77d0de3d9
commit 317f1aa044
12 changed files with 124 additions and 39 deletions
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4
hotspot/src/share/vm/runtime/os.cpp
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@ -1705,8 +1705,8 @@ bool os::release_memory(char* addr, size_t bytes) {
return res;
}
void os::pretouch_memory(void* start, void* end) {
for (volatile char *p = (char*)start; p < (char*)end; p += os::vm_page_size()) {
void os::pretouch_memory(void* start, void* end, size_t page_size) {
for (volatile char *p = (char*)start; p < (char*)end; p += page_size) {
*p = 0;
}
}