Commit 59ae96ff authored by Christian Hansen's avatar Christian Hansen Committed by Linus Torvalds
Browse files

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.

[akpm@linux-foundation.org: simplify mark_page_idle()]
[chansen3@cisco.com: reorganize mark_page_idle() logic, add docs]
  Link: http://lkml.kernel.org/r/20180706172237.21691-1-chansen3@cisco.com
Link: http://lkml.kernel.org/r/20180612153223.13174-1-chansen3@cisco.com


Signed-off-by: default avatarChristian Hansen <chansen3@cisco.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7f1d23e6

Documentation/admin-guide/mm/idle_page_tracking.rst

+5 −0
Original line number Original line Diff line number Diff line
@@ -65,6 +65,11 @@ workload one should: 
    are not reclaimable, he or she can filter them out using

    are not reclaimable, he or she can filter them out using

    ``/proc/kpageflags``.

    ``/proc/kpageflags``.





The page-types tool in the tools/vm directory can be used to assist in this.

If the tool is run initially with the appropriate option, it will mark all the

queried pages as idle.  Subsequent runs of the tool can then show which pages have

their idle flag cleared in the interim.



See :ref:`Documentation/admin-guide/mm/pagemap.rst <pagemap>` for more

See :ref:`Documentation/admin-guide/mm/pagemap.rst <pagemap>` for more

information about ``/proc/pid/pagemap``, ``/proc/kpageflags``, and

information about ``/proc/pid/pagemap``, ``/proc/kpageflags``, and

``/proc/kpagecgroup``.

``/proc/kpagecgroup``.

tools/vm/page-types.c

+46 −1
Original line number Original line Diff line number Diff line
@@ -78,6 +78,8 @@ 
#define PROC_KPAGECOUNT		"/proc/kpagecount"

#define PROC_KPAGECOUNT		"/proc/kpagecount"

#define PROC_KPAGECGROUP	"/proc/kpagecgroup"

#define PROC_KPAGECGROUP	"/proc/kpagecgroup"





#define SYS_KERNEL_MM_PAGE_IDLE "/sys/kernel/mm/page_idle/bitmap"



/* [32-] kernel hacking assistances */

/* [32-] kernel hacking assistances */

#define KPF_RESERVED		32

#define KPF_RESERVED		32

#define KPF_MLOCKED		33

#define KPF_MLOCKED		33
@@ -169,6 +171,7 @@ static const char * const debugfs_known_mountpoints[] = { 




static int		opt_raw;	/* for kernel developers */

static int		opt_raw;	/* for kernel developers */

static int		opt_list;	/* list pages (in ranges) */

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 int		opt_no_summary;	/* don't show summary */

static pid_t		opt_pid;	/* process to walk */

static pid_t		opt_pid;	/* process to walk */

const char		*opt_file;	/* file or directory path */

const char		*opt_file;	/* file or directory path */
@@ -198,6 +201,7 @@ static int pagemap_fd; 
static int		kpageflags_fd;

static int		kpageflags_fd;

static int		kpagecount_fd = -1;

static int		kpagecount_fd = -1;

static int		kpagecgroup_fd = -1;

static int		kpagecgroup_fd = -1;

static int		page_idle_fd = -1;





static int		opt_hwpoison;

static int		opt_hwpoison;

static int		opt_unpoison;

static int		opt_unpoison;
@@ -587,6 +591,30 @@ static int unpoison_page(unsigned long offset) 
	return 0;

	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

 * page frame walker

 */

 */
@@ -635,6 +663,9 @@ static void add_page(unsigned long voffset, unsigned long offset, 
	if (opt_unpoison)

	if (opt_unpoison)

		unpoison_page(offset);

		unpoison_page(offset);





	if (opt_mark_idle)

		mark_page_idle(offset);



	if (opt_list == 1)

	if (opt_list == 1)

		show_page_range(voffset, offset, 1, flags, cgroup, mapcnt);

		show_page_range(voffset, offset, 1, flags, cgroup, mapcnt);

	else if (opt_list == 2)

	else if (opt_list == 2)
@@ -783,6 +814,9 @@ static void walk_addr_ranges(void) 
		else

		else

			walk_task(opt_offset[i], opt_size[i]);

			walk_task(opt_offset[i], opt_size[i]);





	if (opt_mark_idle)

		mark_page_idle(0);



	close(kpageflags_fd);

	close(kpageflags_fd);

}

}
@@ -813,6 +847,7 @@ static void usage(void) 
"            -c|--cgroup  path|@inode   Walk pages within memory cgroup\n"

"            -c|--cgroup  path|@inode   Walk pages within memory cgroup\n"

"            -p|--pid     pid           Walk process address space\n"

"            -p|--pid     pid           Walk process address space\n"

"            -f|--file    filename      Walk file 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                  Show page details in ranges\n"

"            -L|--list-each             Show page details one by one\n"

"            -L|--list-each             Show page details one by one\n"

"            -C|--list-cgroup           Show cgroup inode for pages\n"

"            -C|--list-cgroup           Show cgroup inode for pages\n"
@@ -1221,6 +1256,7 @@ static const struct option opts[] = { 
	{ "bits"      , 1, NULL, 'b' },

	{ "bits"      , 1, NULL, 'b' },

	{ "cgroup"    , 1, NULL, 'c' },

	{ "cgroup"    , 1, NULL, 'c' },

	{ "describe"  , 1, NULL, 'd' },

	{ "describe"  , 1, NULL, 'd' },

	{ "mark-idle" , 0, NULL, 'i' },

	{ "list"      , 0, NULL, 'l' },

	{ "list"      , 0, NULL, 'l' },

	{ "list-each" , 0, NULL, 'L' },

	{ "list-each" , 0, NULL, 'L' },

	{ "list-cgroup", 0, NULL, 'C' },

	{ "list-cgroup", 0, NULL, 'C' },
@@ -1240,7 +1276,7 @@ int main(int argc, char *argv[]) 
	page_size = getpagesize();

	page_size = getpagesize();





	while ((c = getopt_long(argc, argv,

	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) {

				opts, NULL)) != -1) {

		switch (c) {

		switch (c) {

		case 'r':

		case 'r':
@@ -1267,6 +1303,9 @@ int main(int argc, char *argv[]) 
		case 'd':

		case 'd':

			describe_flags(optarg);

			describe_flags(optarg);

			exit(0);

			exit(0);

		case 'i':

			opt_mark_idle = 1;

			break;

		case 'l':

		case 'l':

			opt_list = 1;

			opt_list = 1;

			break;

			break;
@@ -1308,6 +1347,9 @@ int main(int argc, char *argv[]) 
	if (opt_list && opt_list_mapcnt)

	if (opt_list && opt_list_mapcnt)

		kpagecount_fd = checked_open(PROC_KPAGECOUNT, O_RDONLY);

		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)

	if (opt_list && opt_pid)

		printf("voffset\t");

		printf("voffset\t");

	if (opt_list && opt_file)

	if (opt_list && opt_file)
@@ -1341,5 +1383,8 @@ int main(int argc, char *argv[]) 
	if (opt_list_mapcnt)

	if (opt_list_mapcnt)

		close(kpagecount_fd);

		close(kpagecount_fd);





	if (page_idle_fd >= 0)

		close(page_idle_fd);



	return 0;

	return 0;

}
 
}

CRA Git | Maintained and supported by SUSTech CRA and CCSE