The patch titled
Subject: tools/vm/page-types.c: add support for idle page tracking
has been added to the -mm tree. Its filename is
tools-adding-support-for-idle-page-tracking-to-tool.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/tools-adding-support-for-idle-page-tracking-to-tool.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/tools-adding-support-for-idle-page-tracking-to-tool.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Christian Hansen <chansen3@xxxxxxxxx>
Subject: tools/vm/page-types.c: add support for idle page tracking
Add a flag which causes page-types to use the kernels's idle page tracking
to mark pages idle. As the tool already prints the idle flag if set,
subsequent runs will show which pages have been accessed since last run.
Link: http://lkml.kernel.org/r/20180612153223.13174-1-chansen3@xxxxxxxxx
Signed-off-by: Christian Hansen <chansen3@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/vm/page-types.c | 47 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 46 insertions(+), 1 deletion(-)
diff -puN tools/vm/page-types.c~tools-adding-support-for-idle-page-tracking-to-tool tools/vm/page-types.c
--- a/tools/vm/page-types.c~tools-adding-support-for-idle-page-tracking-to-tool
+++ a/tools/vm/page-types.c
@@ -78,6 +78,8 @@
#define PROC_KPAGECOUNT "/proc/kpagecount"
#define PROC_KPAGECGROUP "/proc/kpagecgroup"
+#define SYS_KERNEL_MM_PAGE_IDLE "/sys/kernel/mm/page_idle/bitmap"
+
/* [32-] kernel hacking assistances */
#define KPF_RESERVED 32
#define KPF_MLOCKED 33
@@ -169,6 +171,7 @@ static const char * const debugfs_known_
static int opt_raw; /* for kernel developers */
static int opt_list; /* list pages (in ranges) */
+static int opt_mark_idle; /* set accessed bit */
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 */
@@ -198,6 +201,7 @@ static int pagemap_fd;
static int kpageflags_fd;
static int kpagecount_fd = -1;
static int kpagecgroup_fd = -1;
+static int page_idle_fd = -1;
static int opt_hwpoison;
static int opt_unpoison;
@@ -587,6 +591,30 @@ static int unpoison_page(unsigned long o
return 0;
}
+static int mark_page_idle(unsigned long offset)
+{
+ static unsigned long off;
+ static uint64_t buf;
+ int len;
+
+ if ((offset / 64 == off / 64) || buf == 0) {
+ buf |= 1UL << (offset % 64);
+ off = offset;
+ return 0;
+ }
+
+ len = pwrite(page_idle_fd, &buf, 8, 8 * (off / 64));
+ if (len < 0) {
+ perror("mark page idle");
+ return len;
+ }
+
+ buf = 1UL << (offset % 64);
+ off = offset;
+
+ return 0;
+}
+
/*
* page frame walker
*/
@@ -635,6 +663,9 @@ static void add_page(unsigned long voffs
if (opt_unpoison)
unpoison_page(offset);
+ if (opt_mark_idle)
+ mark_page_idle(offset);
+
if (opt_list == 1)
show_page_range(voffset, offset, 1, flags, cgroup, mapcnt);
else if (opt_list == 2)
@@ -783,6 +814,9 @@ static void walk_addr_ranges(void)
else
walk_task(opt_offset[i], opt_size[i]);
+ if (opt_mark_idle)
+ mark_page_idle(0);
+
close(kpageflags_fd);
}
@@ -813,6 +847,7 @@ static void usage(void)
" -c|--cgroup path|@inode Walk pages within memory cgroup\n"
" -p|--pid pid Walk process address space\n"
" -f|--file filename Walk file address space\n"
+" -i|--mark-idle Mark pages idle\n"
" -l|--list Show page details in ranges\n"
" -L|--list-each Show page details one by one\n"
" -C|--list-cgroup Show cgroup inode for pages\n"
@@ -1221,6 +1256,7 @@ static const struct option opts[] = {
{ "bits" , 1, NULL, 'b' },
{ "cgroup" , 1, NULL, 'c' },
{ "describe" , 1, NULL, 'd' },
+ { "mark-idle" , 0, NULL, 'i' },
{ "list" , 0, NULL, 'l' },
{ "list-each" , 0, NULL, 'L' },
{ "list-cgroup", 0, NULL, 'C' },
@@ -1240,7 +1276,7 @@ int main(int argc, char *argv[])
page_size = getpagesize();
while ((c = getopt_long(argc, argv,
- "rp:f:a:b:d:c:ClLMNXxF:h",
+ "rp:f:a:b:d:c:CilLMNXxF:h",
opts, NULL)) != -1) {
switch (c) {
case 'r':
@@ -1267,6 +1303,9 @@ int main(int argc, char *argv[])
case 'd':
describe_flags(optarg);
exit(0);
+ case 'i':
+ opt_mark_idle = 1;
+ break;
case 'l':
opt_list = 1;
break;
@@ -1308,6 +1347,9 @@ int main(int argc, char *argv[])
if (opt_list && opt_list_mapcnt)
kpagecount_fd = checked_open(PROC_KPAGECOUNT, O_RDONLY);
+ if (opt_mark_idle && opt_file)
+ page_idle_fd = checked_open(SYS_KERNEL_MM_PAGE_IDLE, O_RDWR);
+
if (opt_list && opt_pid)
printf("voffset\t");
if (opt_list && opt_file)
@@ -1341,5 +1383,8 @@ int main(int argc, char *argv[])
if (opt_list_mapcnt)
close(kpagecount_fd);
+ if (page_idle_fd >= 0)
+ close(page_idle_fd);
+
return 0;
}
_
Patches currently in -mm which might be from chansen3@xxxxxxxxx are
tools-modifying-page-types-to-include-shared-map-counts.patch
tools-adding-support-for-idle-page-tracking-to-tool.patch
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