From: Dmitry Stogov <dmitry@zend.com>
Date: Thu, 17 Mar 2016 19:43:42 +0000 (+0300)
Subject: Added ability to disable huge pages in Zend Memeory Manager through the environment... 
X-Git-Tag: php-7.0.5~10
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=75dd4a7a502c271cd2e69fe46b085614beb771b2;p=php

Added ability to disable huge pages in Zend Memeory Manager through the environment variable USE_ZEND_ALLOC_HUGE_PAGES=0.
---

diff --git a/Zend/zend_alloc.c b/Zend/zend_alloc.c
index 6f0542e169..4cf1178c57 100644
--- a/Zend/zend_alloc.c
+++ b/Zend/zend_alloc.c
@@ -200,6 +200,10 @@ typedef struct  _zend_mm_huge_list zend_mm_huge_list;
 # define PTR_FMT "0x%0.8lx"
 #endif
 
+#ifdef MAP_HUGETLB
+int zend_mm_use_huge_pages = 1;
+#endif
+
 /*
  * Memory is retrived from OS by chunks of fixed size 2MB.
  * Inside chunk it's managed by pages of fixed size 4096B.
@@ -462,7 +466,7 @@ static void *zend_mm_mmap(size_t size)
 	void *ptr;
 
 #ifdef MAP_HUGETLB
-	if (size == ZEND_MM_CHUNK_SIZE) {
+	if (zend_mm_use_huge_pages && size == ZEND_MM_CHUNK_SIZE) {
 		ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON | MAP_HUGETLB, -1, 0);
 		if (ptr != MAP_FAILED) {
 			return ptr;
@@ -2647,6 +2651,12 @@ static void alloc_globals_ctor(zend_alloc_globals *alloc_globals)
 		alloc_globals->mm_heap->custom_heap.std._realloc = realloc;
 		return;
 	}
+#endif
+#ifdef MAP_HUGETLB
+	tmp = getenv("USE_ZEND_ALLOC_HUGE_PAGES");
+	if (tmp && !zend_atoi(tmp, 0)) {
+		zend_mm_use_huge_pages = 0;
+	}
 #endif
 	ZEND_TSRMLS_CACHE_UPDATE();
 	alloc_globals->mm_heap = zend_mm_init();