page-types: learn to describe flags directly from command line
Teach page-types to describe page flags directly from the command line. Why is this useful? For instance, if you're using memory hotplug and see this in /var/log/messages: kernel: removing from LRU failed 3836dd0/1/1e00000000000010 It would be nice to decode those page flags without staring at the source. Example usage and output: # Documentation/vm/page-types -d 0x10 0x0000000000000010 ____D_____________________________ dirty # Documentation/vm/page-types -d anon 0x0000000000001000 ____________a_____________________ anonymous # Documentation/vm/page-types -d anon,0x10 0x0000000000001010 ____D_______a_____________________ dirty,anonymous [achiang@hp.com: documentation] Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Haicheng Li <haicheng.li@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -674,6 +674,7 @@ static void usage(void)
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printf(
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"page-types [options]\n"
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" -r|--raw Raw mode, for kernel developers\n"
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" -d|--describe flags Describe flags\n"
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" -a|--addr addr-spec Walk a range of pages\n"
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" -b|--bits bits-spec Walk pages with specified bits\n"
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" -p|--pid pid Walk process address space\n"
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@ -686,6 +687,10 @@ static void usage(void)
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" -X|--hwpoison hwpoison pages\n"
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" -x|--unpoison unpoison pages\n"
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" -h|--help Show this usage message\n"
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"flags:\n"
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" 0x10 bitfield format, e.g.\n"
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" anon bit-name, e.g.\n"
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" 0x10,anon comma-separated list, e.g.\n"
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"addr-spec:\n"
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" N one page at offset N (unit: pages)\n"
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" N+M pages range from N to N+M-1\n"
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@ -884,6 +889,15 @@ static void parse_bits_mask(const char *optarg)
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add_bits_filter(mask, bits);
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}
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static void describe_flags(const char *optarg)
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{
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uint64_t flags = parse_flag_names(optarg, 0);
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printf("0x%016llx\t%s\t%s\n",
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(unsigned long long)flags,
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page_flag_name(flags),
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page_flag_longname(flags));
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}
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static const struct option opts[] = {
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{ "raw" , 0, NULL, 'r' },
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@ -891,6 +905,7 @@ static const struct option opts[] = {
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{ "file" , 1, NULL, 'f' },
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{ "addr" , 1, NULL, 'a' },
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{ "bits" , 1, NULL, 'b' },
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{ "describe" , 1, NULL, 'd' },
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{ "list" , 0, NULL, 'l' },
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{ "list-each" , 0, NULL, 'L' },
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{ "no-summary", 0, NULL, 'N' },
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@ -907,7 +922,7 @@ int main(int argc, char *argv[])
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page_size = getpagesize();
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while ((c = getopt_long(argc, argv,
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"rp:f:a:b:lLNXxh", opts, NULL)) != -1) {
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"rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
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switch (c) {
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case 'r':
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opt_raw = 1;
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@ -924,6 +939,10 @@ int main(int argc, char *argv[])
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case 'b':
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parse_bits_mask(optarg);
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break;
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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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break;
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case 'l':
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opt_list = 1;
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break;
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