Enhance moving PHP code pages into huge pages (#12806)

The former implementation of huge pages for PHP code segments may
fail to map in certain scenarios. For instance, if the initial
'r-x-' segment is not PHP, it will result in a failure to map into
huge pages. Consequently, the optimization for huge pages with PHP
code will no longer be effective.

This patch improves the implementation by accurately matching all
'r-x-' segments until it locates the PHP code segment. Subsequently,
it performs the necessary huge page mapping.


Reviewed-by: chen-hu-97 <hu1.chen@intel.com>

Signed-off-by: PeterYang12 <yuhan.yang@intel.com>

Author: PeterYang12

ext/opcache/ZendAccelerator.c

@@ -3019,11 +3019,16 @@ static void accel_move_code_to_huge_pages(void)
 		long unsigned int  start, end, offset, inode;
 		char perm[5], dev[10], name[MAXPATHLEN];
 		int ret;
-
-		while (1) {
-			ret = fscanf(f, "%lx-%lx %4s %lx %9s %lu %s\n", &start, &end, perm, &offset, dev, &inode, name);
-			if (ret == 7) {
-				if (perm[0] == 'r' && perm[1] == '-' && perm[2] == 'x' && name[0] == '/') {
+		extern char *__progname;
+		char buffer[MAXPATHLEN];
+
+		while (fgets(buffer, MAXPATHLEN, f)) {
+			ret = sscanf(buffer, "%lx-%lx %4s %lx %9s %lu %s\n", &start, &end, perm, &offset, dev, &inode, name);
+			if (ret >= 6) {
+				/* try to find the php text segment and map it into huge pages
+				   Lines without 'name' are going to be skipped */
+				if (ret > 6 && perm[0] == 'r' && perm[1] == '-' && perm[2] == 'x' && name[0] == '/' \
+					&& strstr(name, __progname)) {
 					long unsigned int  seg_start = ZEND_MM_ALIGNED_SIZE_EX(start, huge_page_size);
 					long unsigned int  seg_end = (end & ~(huge_page_size-1L));
 					long unsigned int  real_end;
@@ -3042,8 +3047,6 @@ static void accel_move_code_to_huge_pages(void)
 					}
 					break;
 				}
-			} else {
-				break;
 			}
 		}
 		fclose(f);