From: Alex Chiang <achiang@hp.com>
Date: Tue, 15 Dec 2009 01:57:54 +0000 (-0800)
Subject: page-types: exit early when invoked with -d|--describe
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bb86a7338b7a864c03e1736a8d370b10254b0300;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

page-types: exit early when invoked with -d|--describe

On a system with large amount of memory (256GB), invoking page-types can
take quite a long time, which is unreasonable considering the user only
wants a description of the flags:

	# time ./page-types -d 0x10
	0x0000000000000010	____D_____________________________	dirty

	real	0m34.285s
	user	0m1.966s
	sys	0m32.313s

This is because we still walk the entire address range.

Exiting early seems like a reasonble solution:

# time ./page-types -d 0x10
	0x0000000000000010	____D_____________________________	dirty

	real	0m0.007s
	user	0m0.001s
	sys	0m0.005s

Signed-off-by: Alex Chiang <achiang@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Haicheng Li <haicheng.li@intel.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index 19ca23c773a6..7a7d9bab32ef 100644
--- a/Documentation/vm/page-types.c
+++ b/Documentation/vm/page-types.c
@@ -940,9 +940,8 @@ int main(int argc, char *argv[])
 			parse_bits_mask(optarg);
 			break;
 		case 'd':
-			opt_no_summary = 1;
 			describe_flags(optarg);
-			break;
+			exit(0);
 		case 'l':
 			opt_list = 1;
 			break;