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8190308: Implementation: JEP 316: Heap Allocation on Alternative Memory Devices

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Sub-task to be used for implementation of JEP 316: Support heap allocation on alternative memory devices

Reviewed-by: sangheki, tschatzl
This commit is contained in:
Kishor Kharbas 2017-11-29 17:03:10 -08:00
parent 3faa620f4c
commit 3fc999a1fe
14 changed files with 503 additions and 54 deletions
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31
src/hotspot/os/linux/os_linux.cpp
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@ -130,6 +130,7 @@
#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
#define LARGEPAGES_BIT (1 << 6)
#define DAX_SHARED_BIT (1 << 8)
////////////////////////////////////////////////////////////////////////////////
// global variables
julong os::Linux::_physical_memory = 0;
@ -3370,10 +3371,13 @@ bool os::Linux::hugetlbfs_sanity_check(bool warn, size_t page_size) {
// effective only if the bit 2 is cleared)
// - (bit 5) hugetlb private memory
// - (bit 6) hugetlb shared memory
// - (bit 7) dax private memory
// - (bit 8) dax shared memory
//
static void set_coredump_filter(void) {
static void set_coredump_filter(bool largepages, bool dax_shared) {
FILE *f;
long cdm;
bool filter_changed = false;
if ((f = fopen("/proc/self/coredump_filter", "r+")) == NULL) {
return;
@ -3386,8 +3390,15 @@ static void set_coredump_filter(void) {
rewind(f);
if ((cdm & LARGEPAGES_BIT) == 0) {
if (largepages && (cdm & LARGEPAGES_BIT) == 0) {
cdm |= LARGEPAGES_BIT;
filter_changed = true;
}
if (dax_shared && (cdm & DAX_SHARED_BIT) == 0) {
cdm |= DAX_SHARED_BIT;
filter_changed = true;
}
if (filter_changed) {
fprintf(f, "%#lx", cdm);
}
@ -3526,7 +3537,7 @@ void os::large_page_init() {
size_t large_page_size = Linux::setup_large_page_size();
UseLargePages = Linux::setup_large_page_type(large_page_size);
set_coredump_filter();
set_coredump_filter(true /*largepages*/, false /*dax_shared*/);
}
#ifndef SHM_HUGETLB
@ -3897,6 +3908,17 @@ bool os::can_execute_large_page_memory() {
return UseTransparentHugePages || UseHugeTLBFS;
}
char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) {
assert(file_desc >= 0, "file_desc is not valid");
char* result = pd_attempt_reserve_memory_at(bytes, requested_addr);
if (result != NULL) {
if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) {
vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory"));
}
}
return result;
}
// Reserve memory at an arbitrary address, only if that area is
// available (and not reserved for something else).
@ -5008,6 +5030,9 @@ jint os::init_2(void) {
// initialize thread priority policy
prio_init();
if (!FLAG_IS_DEFAULT(AllocateHeapAt)) {
set_coredump_filter(false /*largepages*/, true /*dax_shared*/);
}
return JNI_OK;
}