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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>
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1 changed files with 1 additions and 2 deletions
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@ -940,9 +940,8 @@ int main(int argc, char *argv[])
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parse_bits_mask(optarg);
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parse_bits_mask(optarg);
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break;
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break;
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case 'd':
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case 'd':
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opt_no_summary = 1;
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describe_flags(optarg);
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describe_flags(optarg);
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break;
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exit(0);
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case 'l':
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case 'l':
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opt_list = 1;
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opt_list = 1;
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break;
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break;
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