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

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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 <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Haicheng Li <[email protected]>
Acked-by: Wu Fengguang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alex Chiang 2009-12-14 17:57:54 -08:00 • committed by Linus Torvalds
commit bb86a7338b
1 changed files with 1 additions and 2 deletions
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3
Documentation/vm/page-types.c
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@ -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;