Documentation/vm/.gitignore: Add page-types

@@ -1,698 +0,0 @@
-/*
- * page-types: Tool for querying page flags
- *
- * Copyright (C) 2009 Intel corporation
- * Copyright (C) 2009 Wu Fengguang <[email protected]>
- */
-
-#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 <sys/types.h>
-#include <sys/errno.h>
-#include <sys/fcntl.h>
-
-
-/*
- * kernel page flags
- */
-
-#define KPF_BYTES		8
-#define PROC_KPAGEFLAGS		"/proc/kpageflags"
-
-/* copied from kpageflags_read() */
-#define KPF_LOCKED		0
-#define KPF_ERROR		1
-#define KPF_REFERENCED		2
-#define KPF_UPTODATE		3
-#define KPF_DIRTY		4
-#define KPF_LRU			5
-#define KPF_ACTIVE		6
-#define KPF_SLAB		7
-#define KPF_WRITEBACK		8
-#define KPF_RECLAIM		9
-#define KPF_BUDDY		10
-
-/* [11-20] new additions in 2.6.31 */
-#define KPF_MMAP		11
-#define KPF_ANON		12
-#define KPF_SWAPCACHE		13
-#define KPF_SWAPBACKED		14
-#define KPF_COMPOUND_HEAD	15
-#define KPF_COMPOUND_TAIL	16
-#define KPF_HUGE		17
-#define KPF_UNEVICTABLE		18
-#define KPF_NOPAGE		20
-
-/* [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
-
-/* [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 char *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_NOPAGE]		= "n:nopage",
-
-	[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_READAHEAD]		= "I:readahead",
-	[KPF_SLOB_FREE]		= "P:slob_free",
-	[KPF_SLUB_FROZEN]	= "A:slub_frozen",
-	[KPF_SLUB_DEBUG]	= "E:slub_debug",
-};
-
-
-/*
- * 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;	/* process to walk */
-
-#define MAX_ADDR_RANGES	1024
-static int		nr_addr_ranges;
-static unsigned long	opt_offset[MAX_ADDR_RANGES];
-static unsigned long	opt_size[MAX_ADDR_RANGES];
-
-#define MAX_BIT_FILTERS	64
-static int		nr_bit_filters;
-static uint64_t		opt_mask[MAX_BIT_FILTERS];
-static uint64_t		opt_bits[MAX_BIT_FILTERS];
-
-static int		page_size;
-
-#define PAGES_BATCH	(64 << 10)	/* 64k pages */
-static int		kpageflags_fd;
-static uint64_t		kpageflags_buf[KPF_BYTES * PAGES_BATCH];
-
-#define HASH_SHIFT	13
-#define HASH_SIZE	(1 << HASH_SHIFT)
-#define HASH_MASK	(HASH_SIZE - 1)
-#define HASH_KEY(flags)	(flags & HASH_MASK)
-
-static unsigned long	total_pages;
-static unsigned long	nr_pages[HASH_SIZE];
-static uint64_t 	page_flags[HASH_SIZE];
-
-
-/*
- * helper functions
- */
-
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-
-#define min_t(type, x, y) ({			\
-	type __min1 = (x);			\
-	type __min2 = (y);			\
-	__min1 < __min2 ? __min1 : __min2; })
-
-static unsigned long pages2mb(unsigned long pages)
-{
-	return (pages * page_size) >> 20;
-}
-
-static void fatal(const char *x, ...)
-{
-	va_list ap;
-
-	va_start(ap, x);
-	vfprintf(stderr, x, ap);
-	va_end(ap);
-	exit(EXIT_FAILURE);
-}
-
-
-/*
- * page flag names
- */
-
-static char *page_flag_name(uint64_t flags)
-{
-	static char buf[65];
-	int present;
-	int i, j;
-
-	for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
-		present = (flags >> i) & 1;
-		if (!page_flag_names[i]) {
-			if (present)
-				fatal("unkown flag bit %d\n", i);
-			continue;
-		}
-		buf[j++] = present ? page_flag_names[i][0] : '_';
-	}
-
-	return buf;
-}
-
-static char *page_flag_longname(uint64_t flags)
-{
-	static char buf[1024];
-	int i, n;
-
-	for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
-		if (!page_flag_names[i])
-			continue;
-		if ((flags >> i) & 1)
-			n += snprintf(buf + n, sizeof(buf) - n, "%s,",
-					page_flag_names[i] + 2);
-	}
-	if (n)
-		n--;
-	buf[n] = '\0';
-
-	return buf;
-}
-
-
-/*
- * page list and summary
- */
-
-static void show_page_range(unsigned long offset, uint64_t flags)
-{
-	static uint64_t      flags0;
-	static unsigned long index;
-	static unsigned long count;
-
-	if (flags == flags0 && offset == index + count) {
-		count++;
-		return;
-	}
-
-	if (count)
-		printf("%lu\t%lu\t%s\n",
-				index, count, page_flag_name(flags0));
-
-	flags0 = flags;
-	index  = offset;
-	count  = 1;
-}
-
-static void show_page(unsigned long offset, uint64_t flags)
-{
-	printf("%lu\t%s\n", offset, page_flag_name(flags));
-}
-
-static void show_summary(void)
-{
-	int i;
-
-	printf("             flags\tpage-count       MB"
-		"  symbolic-flags\t\t\tlong-symbolic-flags\n");
-
-	for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
-		if (nr_pages[i])
-			printf("0x%016llx\t%10lu %8lu  %s\t%s\n",
-				(unsigned long long)page_flags[i],
-				nr_pages[i],
-				pages2mb(nr_pages[i]),
-				page_flag_name(page_flags[i]),
-				page_flag_longname(page_flags[i]));
-	}
-
-	printf("             total\t%10lu %8lu\n",
-			total_pages, pages2mb(total_pages));
-}
-
-
-/*
- * page flag filters
- */
-
-static int bit_mask_ok(uint64_t flags)
-{
-	int i;
-
-	for (i = 0; i < nr_bit_filters; i++) {
-		if (opt_bits[i] == KPF_ALL_BITS) {
-			if ((flags & opt_mask[i]) == 0)
-				return 0;
-		} else {
-			if ((flags & opt_mask[i]) != opt_bits[i])
-				return 0;
-		}
-	}
-
-	return 1;
-}
-
-static uint64_t expand_overloaded_flags(uint64_t flags)
-{
-	/* SLOB/SLUB overload several page flags */
-	if (flags & BIT(SLAB)) {
-		if (flags & BIT(PRIVATE))
-			flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
-		if (flags & BIT(ACTIVE))
-			flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
-		if (flags & BIT(ERROR))
-			flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
-	}
-
-	/* PG_reclaim is overloaded as PG_readahead in the read path */
-	if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
-		flags ^= BIT(RECLAIM) | BIT(READAHEAD);
-
-	return flags;
-}
-
-static uint64_t well_known_flags(uint64_t flags)
-{
-	/* hide flags intended only for kernel hacker */
-	flags &= ~KPF_HACKERS_BITS;
-
-	/* hide non-hugeTLB compound pages */
-	if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
-		flags &= ~BITS_COMPOUND;
-
-	return flags;
-}
-
-
-/*
- * page frame walker
- */
-
-static int hash_slot(uint64_t flags)
-{
-	int k = HASH_KEY(flags);
-	int i;
-
-	/* Explicitly reserve slot 0 for flags 0: the following logic
-	 * cannot distinguish an unoccupied slot from slot (flags==0).
-	 */
-	if (flags == 0)
-		return 0;
-
-	/* search through the remaining (HASH_SIZE-1) slots */
-	for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
-		if (!k || k >= ARRAY_SIZE(page_flags))
-			k = 1;
-		if (page_flags[k] == 0) {
-			page_flags[k] = flags;
-			return k;
-		}
-		if (page_flags[k] == flags)
-			return k;
-	}
-
-	fatal("hash table full: bump up HASH_SHIFT?\n");
-	exit(EXIT_FAILURE);
-}
-
-static void add_page(unsigned long offset, uint64_t flags)
-{
-	flags = expand_overloaded_flags(flags);
-
-	if (!opt_raw)
-		flags = well_known_flags(flags);
-
-	if (!bit_mask_ok(flags))
-		return;
-
-	if (opt_list == 1)
-		show_page_range(offset, flags);
-	else if (opt_list == 2)
-		show_page(offset, flags);
-
-	nr_pages[hash_slot(flags)]++;
-	total_pages++;
-}
-
-static void walk_pfn(unsigned long index, unsigned long count)
-{
-	unsigned long batch;
-	unsigned long n;
-	unsigned long i;
-
-	if (index > ULONG_MAX / KPF_BYTES)
-		fatal("index overflow: %lu\n", index);
-
-	lseek(kpageflags_fd, index * KPF_BYTES, SEEK_SET);
-
-	while (count) {
-		batch = min_t(unsigned long, count, PAGES_BATCH);
-		n = read(kpageflags_fd, kpageflags_buf, batch * KPF_BYTES);
-		if (n == 0)
-			break;
-		if (n < 0) {
-			perror(PROC_KPAGEFLAGS);
-			exit(EXIT_FAILURE);
-		}
-
-		if (n % KPF_BYTES != 0)
-			fatal("partial read: %lu bytes\n", n);
-		n = n / KPF_BYTES;
-
-		for (i = 0; i < n; i++)
-			add_page(index + i, kpageflags_buf[i]);
-
-		index += batch;
-		count -= batch;
-	}
-}
-
-static void walk_addr_ranges(void)
-{
-	int i;
-
-	kpageflags_fd = open(PROC_KPAGEFLAGS, O_RDONLY);
-	if (kpageflags_fd < 0) {
-		perror(PROC_KPAGEFLAGS);
-		exit(EXIT_FAILURE);
-	}
-
-	if (!nr_addr_ranges)
-		walk_pfn(0, ULONG_MAX);
-
-	for (i = 0; i < nr_addr_ranges; i++)
-		walk_pfn(opt_offset[i], opt_size[i]);
-
-	close(kpageflags_fd);
-}
-
-
-/*
- * user interface
- */
-
-static const char *page_flag_type(uint64_t flag)
-{
-	if (flag & KPF_HACKERS_BITS)
-		return "(r)";
-	if (flag & KPF_OVERLOADED_BITS)
-		return "(o)";
-	return "   ";
-}
-
-static void usage(void)
-{
-	int i, j;
-
-	printf(
-"page-types [options]\n"
-"            -r|--raw                  Raw mode, for kernel developers\n"
-"            -a|--addr    addr-spec    Walk a range of pages\n"
-"            -b|--bits    bits-spec    Walk pages with specified bits\n"
-#if 0 /* planned features */
-"            -p|--pid     pid          Walk process address space\n"
-"            -f|--file    filename     Walk file address space\n"
-#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"
-"            -h|--help                 Show this usage message\n"
-"addr-spec:\n"
-"            N                         one page at offset N (unit: pages)\n"
-"            N+M                       pages range from N to N+M-1\n"
-"            N,M                       pages range from N to M-1\n"
-"            N,                        pages range from N to end\n"
-"            ,M                        pages range from 0 to M\n"
-"bits-spec:\n"
-"            bit1,bit2                 (flags & (bit1|bit2)) != 0\n"
-"            bit1,bit2=bit1            (flags & (bit1|bit2)) == bit1\n"
-"            bit1,~bit2                (flags & (bit1|bit2)) == bit1\n"
-"            =bit1,bit2                flags == (bit1|bit2)\n"
-"bit-names:\n"
-	);
-
-	for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
-		if (!page_flag_names[i])
-			continue;
-		printf("%16s%s", page_flag_names[i] + 2,
-				 page_flag_type(1ULL << i));
-		if (++j > 3) {
-			j = 0;
-			putchar('\n');
-		}
-	}
-	printf("\n                                   "
-		"(r) raw mode bits  (o) overloaded bits\n");
-}
-
-static unsigned long long parse_number(const char *str)
-{
-	unsigned long long n;
-
-	n = strtoll(str, NULL, 0);
-
-	if (n == 0 && str[0] != '0')
-		fatal("invalid name or number: %s\n", str);
-
-	return n;
-}
-
-static void parse_pid(const char *str)
-{
-	opt_pid = parse_number(str);
-}
-
-static void parse_file(const char *name)
-{
-}
-
-static void add_addr_range(unsigned long offset, unsigned long size)
-{
-	if (nr_addr_ranges >= MAX_ADDR_RANGES)
-		fatal("too much addr ranges\n");
-
-	opt_offset[nr_addr_ranges] = offset;
-	opt_size[nr_addr_ranges] = size;
-	nr_addr_ranges++;
-}
-
-static void parse_addr_range(const char *optarg)
-{
-	unsigned long offset;
-	unsigned long size;
-	char *p;
-
-	p = strchr(optarg, ',');
-	if (!p)
-		p = strchr(optarg, '+');
-
-	if (p == optarg) {
-		offset = 0;
-		size   = parse_number(p + 1);
-	} else if (p) {
-		offset = parse_number(optarg);
-		if (p[1] == '\0')
-			size = ULONG_MAX;
-		else {
-			size = parse_number(p + 1);
-			if (*p == ',') {
-				if (size < offset)
-					fatal("invalid range: %lu,%lu\n",
-							offset, size);
-				size -= offset;
-			}
-		}
-	} else {
-		offset = parse_number(optarg);
-		size   = 1;
-	}
-
-	add_addr_range(offset, size);
-}
-
-static void add_bits_filter(uint64_t mask, uint64_t bits)
-{
-	if (nr_bit_filters >= MAX_BIT_FILTERS)
-		fatal("too much bit filters\n");
-
-	opt_mask[nr_bit_filters] = mask;
-	opt_bits[nr_bit_filters] = bits;
-	nr_bit_filters++;
-}
-
-static uint64_t parse_flag_name(const char *str, int len)
-{
-	int i;
-
-	if (!*str || !len)
-		return 0;
-
-	if (len <= 8 && !strncmp(str, "compound", len))
-		return BITS_COMPOUND;
-
-	for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
-		if (!page_flag_names[i])
-			continue;
-		if (!strncmp(str, page_flag_names[i] + 2, len))
-			return 1ULL << i;
-	}
-
-	return parse_number(str);
-}
-
-static uint64_t parse_flag_names(const char *str, int all)
-{
-	const char *p    = str;
-	uint64_t   flags = 0;
-
-	while (1) {
-		if (*p == ',' || *p == '=' || *p == '\0') {
-			if ((*str != '~') || (*str == '~' && all && *++str))
-				flags |= parse_flag_name(str, p - str);
-			if (*p != ',')
-				break;
-			str = p + 1;
-		}
-		p++;
-	}
-
-	return flags;
-}
-
-static void parse_bits_mask(const char *optarg)
-{
-	uint64_t mask;
-	uint64_t bits;
-	const char *p;
-
-	p = strchr(optarg, '=');
-	if (p == optarg) {
-		mask = KPF_ALL_BITS;
-		bits = parse_flag_names(p + 1, 0);
-	} else if (p) {
-		mask = parse_flag_names(optarg, 0);
-		bits = parse_flag_names(p + 1, 0);
-	} else if (strchr(optarg, '~')) {
-		mask = parse_flag_names(optarg, 1);
-		bits = parse_flag_names(optarg, 0);
-	} else {
-		mask = parse_flag_names(optarg, 0);
-		bits = KPF_ALL_BITS;
-	}
-
-	add_bits_filter(mask, bits);
-}
-
-
-static struct option opts[] = {
-	{ "raw"       , 0, NULL, 'r' },
-	{ "pid"       , 1, NULL, 'p' },
-	{ "file"      , 1, NULL, 'f' },
-	{ "addr"      , 1, NULL, 'a' },
-	{ "bits"      , 1, NULL, 'b' },
-	{ "list"      , 0, NULL, 'l' },
-	{ "list-each" , 0, NULL, 'L' },
-	{ "no-summary", 0, NULL, 'N' },
-	{ "help"      , 0, NULL, 'h' },
-	{ NULL        , 0, NULL, 0 }
-};
-
-int main(int argc, char *argv[])
-{
-	int c;
-
-	page_size = getpagesize();
-
-	while ((c = getopt_long(argc, argv,
-				"rp:f:a:b:lLNh", opts, NULL)) != -1) {
-		switch (c) {
-		case 'r':
-			opt_raw = 1;
-			break;
-		case 'p':
-			parse_pid(optarg);
-			break;
-		case 'f':
-			parse_file(optarg);
-			break;
-		case 'a':
-			parse_addr_range(optarg);
-			break;
-		case 'b':
-			parse_bits_mask(optarg);
-			break;
-		case 'l':
-			opt_list = 1;
-			break;
-		case 'L':
-			opt_list = 2;
-			break;
-		case 'N':
-			opt_no_summary = 1;
-			break;
-		case 'h':
-			usage();
-			exit(0);
-		default:
-			usage();
-			exit(1);
-		}
-	}
-
-	if (opt_list == 1)
-		printf("offset\tcount\tflags\n");
-	if (opt_list == 2)
-		printf("offset\tflags\n");
-
-	walk_addr_ranges();
-
-	if (opt_list == 1)
-		show_page_range(0, 0);  /* drain the buffer */
-
-	if (opt_no_summary)
-		return 0;
-
-	if (opt_list)
-		printf("\n\n");
-
-	show_summary();
-
-	return 0;
-}

698 lines not on this page · raw message

@@ -94,6 +94,7 @@ static const struct file_operations proc
 #define KPF_COMPOUND_TAIL	16
 #define KPF_HUGE		17
 #define KPF_UNEVICTABLE		18
+#define KPF_HWPOISON		19
 #define KPF_NOPAGE		20
 
 #define KPF_KSM			21

@@ -180,6 +181,10 @@ static u64 get_uflags(struct page *page)
 	u |= kpf_copy_bit(k, KPF_UNEVICTABLE,	PG_unevictable);
 	u |= kpf_copy_bit(k, KPF_MLOCKED,	PG_mlocked);
 
+#ifdef CONFIG_MEMORY_FAILURE
+	u |= kpf_copy_bit(k, KPF_HWPOISON,	PG_hwpoison);
+#endif
+
 #ifdef CONFIG_IA64_UNCACHED_ALLOCATOR
 	u |= kpf_copy_bit(k, KPF_UNCACHED,	PG_uncached);
 #endif

@@ -47,6 +47,7 @@
 #define KPF_COMPOUND_TAIL	16
 #define KPF_HUGE		17
 #define KPF_UNEVICTABLE		18
+#define KPF_HWPOISON		19
 #define KPF_NOPAGE		20
 
 /* [32-] kernel hacking assistances */

@@ -94,6 +95,7 @@ static char *page_flag_names[] = {
 	[KPF_COMPOUND_TAIL]	= "T:compound_tail",
 	[KPF_HUGE]		= "G:huge",
 	[KPF_UNEVICTABLE]	= "u:unevictable",
+	[KPF_HWPOISON]		= "X:hwpoison",
 	[KPF_NOPAGE]		= "n:nopage",
 
 	[KPF_RESERVED]		= "r:reserved",

@@ -49,6 +49,7 @@
 #define KPF_UNEVICTABLE		18
 #define KPF_HWPOISON		19
 #define KPF_NOPAGE		20
+#define KPF_KSM			21
 
 /* [32-] kernel hacking assistances */
 #define KPF_RESERVED		32

@@ -97,6 +98,7 @@ static char *page_flag_names[] = {
 	[KPF_UNEVICTABLE]	= "u:unevictable",
 	[KPF_HWPOISON]		= "X:hwpoison",
 	[KPF_NOPAGE]		= "n:nopage",
+	[KPF_KSM]		= "x:ksm",
 
 	[KPF_RESERVED]		= "r:reserved",
 	[KPF_MLOCKED]		= "m:mlocked",

@@ -49,6 +49,7 @@
 #define KPF_UNEVICTABLE		18
 #define KPF_HWPOISON		19
 #define KPF_NOPAGE		20
+#define KPF_KSM			21
 
 /* [32-] kernel hacking assistances */
 #define KPF_RESERVED		32

@@ -97,6 +98,7 @@ static char *page_flag_names[] = {
 	[KPF_UNEVICTABLE]	= "u:unevictable",
 	[KPF_HWPOISON]		= "X:hwpoison",
 	[KPF_NOPAGE]		= "n:nopage",
+	[KPF_KSM]		= "x:ksm",
 
 	[KPF_RESERVED]		= "r:reserved",
 	[KPF_MLOCKED]		= "m:mlocked",