| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20091103225441.GB4087@grease>
Date: Tue, 3 Nov 2009 15:54:41 -0700
From: Alex Chiang <achiang@...com>
To: fengguang.wu@...el.com, akpm@...ux-foundation.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] page-types: decode flags directly from command line
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@...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;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists