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authorDavid Rientjes <rientjes@google.com>2018-02-01 03:21:23 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-02-01 04:18:40 +0300
commitc7905f200225d4257536f19b11d18f598fee5f44 (patch)
tree4eb2efaa0d330e6ed9b53e4f943eb7b776111389
parente02a9f048ef79a411904bef075fd3ce4204052a9 (diff)
downloadlinux-c7905f200225d4257536f19b11d18f598fee5f44.tar.xz
tools, vm: new option to specify kpageflags file
page-types currently hardcodes /proc/kpageflags as the file to parse. This works when using the tool to examine the state of pageflags on the same system, but does not allow storing a snapshot of pageflags at a given time to debug issues nor on a different system. This allows the user to specify a saved version of kpageflags with a new page-types -F option. [akpm@linux-foundation.org: add "filename" to fix usage() string] [rientjes@google.com: fix layout] Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1801301840050.140969@chino.kir.corp.google.com Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1801301458180.153857@chino.kir.corp.google.com Signed-off-by: David Rientjes <rientjes@google.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--tools/vm/page-types.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index e92903fc7113..a8783f48f77f 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -169,9 +169,10 @@ static int opt_raw; /* for kernel developers */
static int opt_list; /* list pages (in ranges) */
static int opt_no_summary; /* don't show summary */
static pid_t opt_pid; /* process to walk */
-const char * opt_file; /* file or directory path */
+const char *opt_file; /* file or directory path */
static uint64_t opt_cgroup; /* cgroup inode */
static int opt_list_cgroup;/* list page cgroup */
+static const char *opt_kpageflags;/* kpageflags file to parse */
#define MAX_ADDR_RANGES 1024
static int nr_addr_ranges;
@@ -258,7 +259,7 @@ static int checked_open(const char *pathname, int flags)
* pagemap/kpageflags routines
*/
-static unsigned long do_u64_read(int fd, char *name,
+static unsigned long do_u64_read(int fd, const char *name,
uint64_t *buf,
unsigned long index,
unsigned long count)
@@ -283,7 +284,7 @@ static unsigned long kpageflags_read(uint64_t *buf,
unsigned long index,
unsigned long pages)
{
- return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
+ return do_u64_read(kpageflags_fd, opt_kpageflags, buf, index, pages);
}
static unsigned long kpagecgroup_read(uint64_t *buf,
@@ -293,7 +294,7 @@ static unsigned long kpagecgroup_read(uint64_t *buf,
if (kpagecgroup_fd < 0)
return pages;
- return do_u64_read(kpagecgroup_fd, PROC_KPAGEFLAGS, buf, index, pages);
+ return do_u64_read(kpagecgroup_fd, opt_kpageflags, buf, index, pages);
}
static unsigned long pagemap_read(uint64_t *buf,
@@ -743,7 +744,7 @@ static void walk_addr_ranges(void)
{
int i;
- kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
+ kpageflags_fd = checked_open(opt_kpageflags, O_RDONLY);
if (!nr_addr_ranges)
add_addr_range(0, ULONG_MAX);
@@ -790,6 +791,7 @@ static void usage(void)
" -N|--no-summary Don't show summary info\n"
" -X|--hwpoison hwpoison pages\n"
" -x|--unpoison unpoison pages\n"
+" -F|--kpageflags filename kpageflags file to parse\n"
" -h|--help Show this usage message\n"
"flags:\n"
" 0x10 bitfield format, e.g.\n"
@@ -1013,7 +1015,7 @@ static void walk_page_cache(void)
{
struct stat st;
- kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
+ kpageflags_fd = checked_open(opt_kpageflags, O_RDONLY);
pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
sigaction(SIGBUS, &sigbus_action, NULL);
@@ -1164,6 +1166,11 @@ static void parse_bits_mask(const char *optarg)
add_bits_filter(mask, bits);
}
+static void parse_kpageflags(const char *name)
+{
+ opt_kpageflags = name;
+}
+
static void describe_flags(const char *optarg)
{
uint64_t flags = parse_flag_names(optarg, 0);
@@ -1188,6 +1195,7 @@ static const struct option opts[] = {
{ "no-summary", 0, NULL, 'N' },
{ "hwpoison" , 0, NULL, 'X' },
{ "unpoison" , 0, NULL, 'x' },
+ { "kpageflags", 0, NULL, 'F' },
{ "help" , 0, NULL, 'h' },
{ NULL , 0, NULL, 0 }
};
@@ -1199,7 +1207,7 @@ int main(int argc, char *argv[])
page_size = getpagesize();
while ((c = getopt_long(argc, argv,
- "rp:f:a:b:d:c:ClLNXxh", opts, NULL)) != -1) {
+ "rp:f:a:b:d:c:ClLNXxF:h", opts, NULL)) != -1) {
switch (c) {
case 'r':
opt_raw = 1;
@@ -1242,6 +1250,9 @@ int main(int argc, char *argv[])
opt_unpoison = 1;
prepare_hwpoison_fd();
break;
+ case 'F':
+ parse_kpageflags(optarg);
+ break;
case 'h':
usage();
exit(0);
@@ -1251,6 +1262,9 @@ int main(int argc, char *argv[])
}
}
+ if (!opt_kpageflags)
+ opt_kpageflags = PROC_KPAGEFLAGS;
+
if (opt_cgroup || opt_list_cgroup)
kpagecgroup_fd = checked_open(PROC_KPAGECGROUP, O_RDONLY);