Messages in this thread Patch in this message | | | Date | Tue, 3 Nov 2009 15:54:41 -0700 | From | Alex Chiang <> | Subject | [PATCH] page-types: decode flags directly from command line |
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Teach page-types to decode 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 3836dd0/1/1e00000000000400
It would be nice to decode those page flags without staring at the source.
Example usage and output:
linux-2.6/Documentation/vm$ ./page-types -d 0x1e00000000000400 flags page-count MB symbolic-flags long-symbolic-flags 0x1e00000000000400 1 0 __________B_______________________buddy total 1 0
Signed-off-by: Alex Chiang <achiang@hp.com> --- page-types.c | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) --- diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c index 3ec4f2a..a55c624 100644 --- a/Documentation/vm/page-types.c +++ b/Documentation/vm/page-types.c @@ -674,6 +674,7 @@ static void usage(void) printf( "page-types [options]\n" " -r|--raw Raw mode, for kernel developers\n" +" -d|--decode flags Decode a single page's flags\n" " -a|--addr addr-spec Walk a range of pages\n" " -b|--bits bits-spec Walk pages with specified bits\n" " -p|--pid pid Walk process address space\n" @@ -682,10 +683,12 @@ static void usage(void) #endif " -l|--list Show page details in ranges\n" " -L|--list-each Show page details one by one\n" -" -N|--no-summary Don't show summay info\n" +" -N|--no-summary Don't show summary info\n" " -X|--hwpoison hwpoison pages\n" " -x|--unpoison unpoison pages\n" " -h|--help Show this usage message\n" +"flags:\n" +" 0x0000000000000400 A single page's flags, e.g.\n" "addr-spec:\n" " N one page at offset N (unit: pages)\n" " N+M pages range from N to N+M-1\n" @@ -884,12 +887,28 @@ static void parse_bits_mask(const char *optarg) add_bits_filter(mask, bits); } +static void decode_flags_and_exit(const char *optarg) +{ + uint64_t flags; + + flags = parse_number(optarg); + + opt_list = 0; + opt_hwpoison = 0; + opt_unpoison = 0; + + add_page(0, 0, flags); + show_summary(); + + exit(0); +} static struct option opts[] = { { "raw" , 0, NULL, 'r' }, { "pid" , 1, NULL, 'p' }, { "file" , 1, NULL, 'f' }, { "addr" , 1, NULL, 'a' }, + { "decode" , 1, NULL, 'd' }, { "bits" , 1, NULL, 'b' }, { "list" , 0, NULL, 'l' }, { "list-each" , 0, NULL, 'L' }, @@ -907,7 +926,7 @@ int main(int argc, char *argv[]) page_size = getpagesize(); while ((c = getopt_long(argc, argv, - "rp:f:a:b:lLNXxh", opts, NULL)) != -1) { + "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) { switch (c) { case 'r': opt_raw = 1; @@ -924,6 +943,9 @@ int main(int argc, char *argv[]) case 'b': parse_bits_mask(optarg); break; + case 'd': + decode_flags_and_exit(optarg); + break; case 'l': opt_list = 1; break;
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