Enhance moving PHP code pages into huge pages

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.

Signed-off-by: PeterYang12 <yuhan.yang@intel.com>
Reviewed-by: chen-hu-97 <hu1.chen@intel.com>

Author: PeterYang12

ext/opcache/ZendAccelerator.c

@@ -3019,11 +3019,15 @@ 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
+				char *is_substring = strstr(name, __progname);
+				if (perm[0] == 'r' && perm[1] == '-' && perm[2] == 'x' && name[0] == '/' && is_substring != NULL) {
 					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;