parse: prefault config file with MAP_POPULATE

When we call lxc_file_for_each_line_mmap() we will always parse the whole config file. Prefault it in case it is really long to optimize performance. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

parse: prefault config file with MAP_POPULATE
1835a8c5 · Christian Brauner · 316be863 · 1835a8c5
Unverified Commit 1835a8c5 authored Oct 02, 2018 by Christian Brauner
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parse.c src/lxc/parse.c +2 -1

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--- a/src/lxc/parse.c
+++ b/src/lxc/parse.c
@@ -88,7 +88,8 @@ int lxc_file_for_each_line_mmap(const char *file, lxc_file_cb callback,
 		return 0;
 	}
-	buf = lxc_strmmap(NULL, st.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	buf = lxc_strmmap(NULL, st.st_size, PROT_READ | PROT_WRITE,
+			  MAP_PRIVATE | MAP_POPULATE, fd, 0);
 	if (buf == MAP_FAILED) {
 		close(fd);
 		return -1;