path: root/tools/vm/page-types.c

/*
 * page-types: Tool for querying page flags
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; version 2.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should find a copy of v2 of the GNU General Public License somewhere on
 * your Linux system; if not, write to the Free Software Foundation, Inc., 59
 * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * Copyright (C) 2009 Intel corporation
 *
 * Authors: Wu Fengguang <fengguang.wu@intel.com>
 */

#define _FILE_OFFSET_BITS 64
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <getopt.h>
#include <limits.h>
#include <assert.h>
#include <ftw.h>
#include <time.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/mount.h>
#include <sys/statfs.h>
#include <sys/mman.h>
#include "../../include/uapi/linux/magic.h"
#include "../../include/uapi/linux/kernel-page-flags.h"
#include <api/fs/debugfs.h>

#ifndef MAX_PATH
# define MAX_PATH 256
#endif

#ifndef STR
# define _STR(x) #x
# define STR(x) _STR(x)
#endif

/*
 * pagemap kernel ABI bits
 */

#define PM_ENTRY_BYTES      sizeof(uint64_t)
#define PM_STATUS_BITS      3
#define PM_STATUS_OFFSET    (64 - PM_STATUS_BITS)
#define PM_STATUS_MASK      (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
#define PM_STATUS(nr)       (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
#define PM_PSHIFT_BITS      6
#define PM_PSHIFT_OFFSET    (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
#define PM_PSHIFT_MASK      (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
#define __PM_PSHIFT(x)      (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
#define PM_PFRAME_MASK      ((1LL << PM_PSHIFT_OFFSET) - 1)
#define PM_PFRAME(x)        ((x) & PM_PFRAME_MASK)

#define __PM_SOFT_DIRTY      (1LL)
#define PM_PRESENT          PM_STATUS(4LL)
#define PM_SWAP             PM_STATUS(2LL)
#define PM_SOFT_DIRTY       __PM_PSHIFT(__PM_SOFT_DIRTY)


/*
 * kernel page flags
 */

#define KPF_BYTES		8
#define PROC_KPAGEFLAGS		"/proc/kpageflags"

/* [32-] kernel hacking assistances */
#define KPF_RESERVED		32
#define KPF_MLOCKED		33
#define KPF_MAPPEDTODISK	34
#define KPF_PRIVATE		35
#define KPF_PRIVATE_2		36
#define KPF_OWNER_PRIVATE	37
#define KPF_ARCH		38
#define KPF_UNCACHED		39
#define KPF_SOFTDIRTY		40

/* [48-] take some arbitrary free slots for expanding overloaded flags
 * not part of kernel API
 */
#define KPF_READAHEAD		48
#define KPF_SLOB_FREE		49
#define KPF_SLUB_FROZEN		50
#define KPF_SLUB_DEBUG		51

#define KPF_ALL_BITS		((uint64_t)~0ULL)
#define KPF_HACKERS_BITS	(0xffffULL << 32)
#define KPF_OVERLOADED_BITS	(0xffffULL << 48)
#define BIT(name)		(1ULL << KPF_##name)
#define BITS_COMPOUND		(BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))

static const char * const page_flag_names[] = {
	[KPF_LOCKED]		= "L:locked",
	[KPF_ERROR]		= "E:error",
	[KPF_REFERENCED]	= "R:referenced",
	[KPF_UPTODATE]		= "U:uptodate",
	[KPF_DIRTY]		= "D:dirty",
	[KPF_LRU]		= "l:lru",
	[KPF_ACTIVE]		= "A:active",
	[KPF_SLAB]		= "S:slab",
	[KPF_WRITEBACK]		= "W:writeback",
	[KPF_RECLAIM]		= "I:reclaim",
	[KPF_BUDDY]		= "B:buddy",

	[KPF_MMAP]		= "M:mmap",
	[KPF_ANON]		= "a:anonymous",
	[KPF_SWAPCACHE]		= "s:swapcache",
	[KPF_SWAPBACKED]	= "b:swapbacked",
	[KPF_COMPOUND_HEAD]	= "H:compound_head",
	[KPF_COMPOUND_TAIL]	= "T:compound_tail",
	[KPF_HUGE]		= "G:huge",
	[KPF_UNEVICTABLE]	= "u:unevictable",
	[KPF_HWPOISON]		= "X:hwpoison",
	[KPF_NOPAGE]		= "n:nopage",
	[KPF_KSM]		= "x:ksm",
	[KPF_THP]		= "t:thp",

	[KPF_RESERVED]		= "r:reserved",
	[KPF_MLOCKED]		= "m:mlocked",
	[KPF_MAPPEDTODISK]	= "d:mappedtodisk",
	[KPF_PRIVATE]		= "P:private",
	[KPF_PRIVATE_2]		= "p:private_2",
	[KPF_OWNER_PRIVATE]	= "O:owner_private",
	[KPF_ARCH]		= "h:arch",
	[KPF_UNCACHED]		= "c:uncached",
	[KPF_SOFTDIRTY]		= "f:softdirty",

	[KPF_READAHEAD]		= "I:readahead",
	[KPF_SLOB_FREE]		= "P:slob_free",
	[KPF_SLUB_FROZEN]	= "A:slub_frozen",
	[KPF_SLUB_DEBUG]	= "E:slub_debug",
};


static const char * const debugfs_known_mountpoints[] = {
	"/sys/kernel/debug",
	"/debug",
	0,
};

/*
 * data structures
 */

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;