diff options
Diffstat (limited to 'ext/opcache/shared_alloc_mmap.c')
| -rw-r--r-- | ext/opcache/shared_alloc_mmap.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/ext/opcache/shared_alloc_mmap.c b/ext/opcache/shared_alloc_mmap.c index d995e20f12..5744fc8167 100644 --- a/ext/opcache/shared_alloc_mmap.c +++ b/ext/opcache/shared_alloc_mmap.c @@ -46,6 +46,22 @@ static int create_segments(size_t requested_size, zend_shared_segment ***shared_ shared_segment = (zend_shared_segment *)((char *)(*shared_segments_p) + sizeof(void *)); (*shared_segments_p)[0] = shared_segment; +#ifdef MAP_HUGETLB + /* Try to allocate huge pages first to reduce dTLB misses. + * OS has to be configured properly + * (e.g. https://wiki.debian.org/Hugepages#Enabling_HugeTlbPage) + * You may verify huge page usage with the following command: + * `grep "Huge" /proc/meminfo` + */ + shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0); + if (shared_segment->p != MAP_FAILED) { + shared_segment->pos = 0; + shared_segment->size = requested_size; + + return ALLOC_SUCCESS; + } +#endif + shared_segment->p = mmap(0, requested_size, PROT_READ | PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0); if (shared_segment->p == MAP_FAILED) { *error_in = "mmap"; |