romenskiy2012/jemalloc
1
0
Fork 0
mirror of https://github.com/jemalloc/jemalloc.git synced 2026-08-05 01:46:16 +03:00
Code Issues Projects Releases Packages Wiki Activity

Implement opt.metadata_thp

Browse source 
This option enables transparent huge page for base allocators (require
MADV_HUGEPAGE support).
This commit is contained in:
Qi Wang 2017-08-10 13:14:26 -07:00 • committed by Qi Wang
parent d157864027
commit 8fdd9a5797
12 changed files with 118 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

53
src/pages.c
View file

@ -25,6 +25,8 @@ static int mmap_flags;
#endif
static bool os_overcommits;
bool thp_state_madvise;
/******************************************************************************/
/*
* Function prototypes for static functions that are referenced prior to
@ -291,7 +293,7 @@ pages_huge(void *addr, size_t size) {
assert(HUGEPAGE_ADDR2BASE(addr) == addr);
assert(HUGEPAGE_CEILING(size) == size);
#ifdef JEMALLOC_THP
#ifdef JEMALLOC_HAVE_MADVISE_HUGE
return (madvise(addr, size, MADV_HUGEPAGE) != 0);
#else
return true;
@ -303,7 +305,7 @@ pages_nohuge(void *addr, size_t size) {
assert(HUGEPAGE_ADDR2BASE(addr) == addr);
assert(HUGEPAGE_CEILING(size) == size);
#ifdef JEMALLOC_THP
#ifdef JEMALLOC_HAVE_MADVISE_HUGE
return (madvise(addr, size, MADV_NOHUGEPAGE) != 0);
#else
return false;
@ -413,6 +415,51 @@ os_overcommits_proc(void) {
}
#endif
static void
init_thp_state(void) {
#ifndef JEMALLOC_HAVE_MADVISE_HUGE
if (opt_metadata_thp && opt_abort) {
malloc_write("<jemalloc>: no MADV_HUGEPAGE support\n");
abort();
}
goto label_error;
#endif
static const char madvise_state[] = "always [madvise] never\n";
char buf[sizeof(madvise_state)];
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_open)
int fd = (int)syscall(SYS_open,
"/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#else
int fd = open("/sys/kernel/mm/transparent_hugepage/enabled", O_RDONLY);
#endif
if (fd == -1) {
goto label_error;
}
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_read)
ssize_t nread = (ssize_t)syscall(SYS_read, fd, &buf, sizeof(buf));
#else
ssize_t nread = read(fd, &buf, sizeof(buf));
#endif
#if defined(JEMALLOC_USE_SYSCALL) && defined(SYS_close)
syscall(SYS_close, fd);
#else
close(fd);
#endif
if (nread < 1) {
goto label_error;
}
if (strncmp(buf, madvise_state, (size_t)nread) == 0) {
thp_state_madvise = true;
return;
}
label_error:
thp_state_madvise = false;
}
bool
pages_boot(void) {
os_page = os_page_detect();
@ -441,5 +488,7 @@ pages_boot(void) {
os_overcommits = false;
#endif
init_thp_state();
return false;
}