diff options
Diffstat (limited to 'tools/vm/page-types.c')
| -rw-r--r-- | tools/vm/page-types.c | 1396 |
1 files changed, 0 insertions, 1396 deletions
diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c deleted file mode 100644 index 381dcc00cb62..000000000000 --- a/tools/vm/page-types.c +++ /dev/null @@ -1,1396 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * page-types: Tool for querying page flags - * - * 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 <setjmp.h> -#include <signal.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/fs.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 8 -#define PM_PFRAME_BITS 55 -#define PM_PFRAME_MASK ((1LL << PM_PFRAME_BITS) - 1) -#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) -#define MAX_SWAPFILES_SHIFT 5 -#define PM_SWAP_OFFSET(x) (((x) & PM_PFRAME_MASK) >> MAX_SWAPFILES_SHIFT) -#define PM_SOFT_DIRTY (1ULL << 55) -#define PM_MMAP_EXCLUSIVE (1ULL << 56) -#define PM_FILE (1ULL << 61) -#define PM_SWAP (1ULL << 62) -#define PM_PRESENT (1ULL << 63) - -/* - * kernel page flags - */ - -#define KPF_BYTES 8 -#define PROC_KPAGEFLAGS "/proc/kpageflags" -#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 -#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 -#define KPF_ARCH_2 41 - -/* [47-] take some arbitrary free slots for expanding overloaded flags - * not part of kernel API - */ -#define KPF_ANON_EXCLUSIVE 47 -#define KPF_READAHEAD 48 -#define KPF_SLOB_FREE 49 -#define KPF_SLUB_FROZEN 50 -#define KPF_SLUB_DEBUG 51 -#define KPF_FILE 61 -#define KPF_SWAP 62 -#define KPF_MMAP_EXCLUSIVE 63 - -#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_OFFLINE] = "o:offline", - [KPF_PGTABLE] = "g:pgtable", - [KPF_ZERO_PAGE] = "z:zero_page", - [KPF_IDLE] = "i:idle_page", - - [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_ARCH_2] = "H:arch_2", - - [KPF_ANON_EXCLUSIVE] = "d:anon_exclusive", - [KPF_READAHEAD] = "I:readahead", - [KPF_SLOB_FREE] = "P:slob_free", - [KPF_SLUB_FROZEN] = "A:slub_frozen", - [KPF_SLUB_DEBUG] = "E:slub_debug", - - [KPF_FILE] = "F:file", - [KPF_SWAP] = "w:swap", - [KPF_MMAP_EXCLUSIVE] = "1:mmap_exclusive", -}; - - -/* - * data structures - */ - -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 */ -static uint64_t opt_cgroup; /* cgroup inode */ -static int opt_list_cgroup;/* list page cgroup */ -static int opt_list_mapcnt;/* list page map count */ -static const char *opt_kpageflags;/* kpageflags file to parse */ - -#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_VMAS 10240 -static int nr_vmas; -static unsigned long pg_start[MAX_VMAS]; -static unsigned long pg_end[MAX_VMAS]; - -#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; - -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; - -static const char *hwpoison_debug_fs; -static int hwpoison_inject_fd; -static int hwpoison_forget_fd; - -#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; }) - -#define max_t(type, x, y) ({ \ - type __max1 = (x); \ - type __max2 = (y); \ - __max1 > __max2 ? __max1 : __max2; }) - -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); -} - -static int checked_open(const char *pathname, int flags) -{ - int fd = open(pathname, flags); - - if (fd < 0) { - perror(pathname); - exit(EXIT_FAILURE); - } - - return fd; -} - -/* - * pagemap/kpageflags routines - */ - -static unsigned long do_u64_read(int fd, const char *name, - uint64_t *buf, - unsigned long index, - unsigned long count) -{ - long bytes; - - if (index > ULONG_MAX / 8) - fatal("index overflow: %lu\n", index); - - bytes = pread(fd, buf, count * 8, (off_t)index * 8); - if (bytes < 0) { - perror(name); - exit(EXIT_FAILURE); - } - if (bytes % 8) - fatal("partial read: %lu bytes\n", bytes); - - return bytes / 8; -} - -static unsigned long kpageflags_read(uint64_t *buf, - unsigned long index, - unsigned long pages) -{ - return do_u64_read(kpageflags_fd, opt_kpageflags, buf, index, pages); -} - -static unsigned long kpagecgroup_read(uint64_t *buf, - unsigned long index, - unsigned long pages) -{ - if (kpagecgroup_fd < 0) - return pages; - - return do_u64_read(kpagecgroup_fd, opt_kpageflags, buf, index, pages); -} - -static unsigned long kpagecount_read(uint64_t *buf, - unsigned long index, - unsigned long pages) -{ - return kpagecount_fd < 0 ? pages : - do_u64_read(kpagecount_fd, PROC_KPAGECOUNT, - buf, index, pages); -} - -static unsigned long pagemap_read(uint64_t *buf, - unsigned long index, - unsigned long pages) -{ - return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages); -} - -static unsigned long pagemap_pfn(uint64_t val) -{ - unsigned long pfn; - - if (val & PM_PRESENT) - pfn = PM_PFRAME(val); - else - pfn = 0; - - return pfn; -} - -static unsigned long pagemap_swap_offset(uint64_t val) -{ - return val & PM_SWAP ? PM_SWAP_OFFSET(val) : 0; -} - -/* - * page flag names - */ - -static char *page_flag_name(uint64_t flags) -{ - static char buf[65]; - int present; - size_t 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("unknown 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]; - size_t 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 voffset, unsigned long offset, - unsigned long size, uint64_t flags, - uint64_t cgroup, uint64_t mapcnt) -{ - static uint64_t flags0; - static uint64_t cgroup0; - static uint64_t mapcnt0; - static unsigned long voff; - static unsigned long index; - static unsigned long count; - - if (flags == flags0 && cgroup == cgroup0 && mapcnt == mapcnt0 && - offset == index + count && size && voffset == voff + count) { - count += size; - return; - } - - if (count) { - if (opt_pid) - printf("%lx\t", voff); - if (opt_file) - printf("%lx\t", voff); - if (opt_list_cgroup) - printf("@%llu\t", (unsigned long long)cgroup0); - if (opt_list_mapcnt) - printf("%lu\t", mapcnt0); - printf("%lx\t%lx\t%s\n", - index, count, page_flag_name(flags0)); - } - - flags0 = flags; - cgroup0 = cgroup; - mapcnt0 = mapcnt; - index = offset; - voff = voffset; - count = size; -} - -static void flush_page_range(void) -{ - show_page_range(0, 0, 0, 0, 0, 0); -} - -static void show_page(unsigned long voffset, unsigned long offset, - uint64_t flags, uint64_t cgroup, uint64_t mapcnt) -{ - if (opt_pid) - printf("%lx\t", voffset); - if (opt_file) - printf("%lx\t", voffset); - if (opt_list_cgroup) - printf("@%llu\t", (unsigned long long)cgroup); - if (opt_list_mapcnt) - printf("%lu\t", mapcnt); - - printf("%lx\t%s\n", offset, page_flag_name(flags)); -} - -static void show_summary(void) -{ - size_t 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, uint64_t pme) -{ - /* Anonymous pages overload PG_mappedtodisk */ - if ((flags & BIT(ANON)) && (flags & BIT(MAPPEDTODISK))) - flags ^= BIT(MAPPEDTODISK) | BIT(ANON_EXCLUSIVE); - - /* 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); - - if (pme & PM_SOFT_DIRTY) - flags |= BIT(SOFTDIRTY); - if (pme & PM_FILE) - flags |= BIT(FILE); - if (pme & PM_SWAP) - flags |= BIT(SWAP); - if (pme & PM_MMAP_EXCLUSIVE) - flags |= BIT(MMAP_EXCLUSIVE); - - 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; -} - -static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme) -{ - if (opt_raw) - flags = expand_overloaded_flags(flags, pme); - else - flags = well_known_flags(flags); - - return flags; -} - -/* - * page actions - */ - -static void prepare_hwpoison_fd(void) -{ - char buf[MAX_PATH + 1]; - - hwpoison_debug_fs = debugfs__mount(); - if (!hwpoison_debug_fs) { - perror("mount debugfs"); - exit(EXIT_FAILURE); - } - - if (opt_hwpoison && !hwpoison_inject_fd) { - snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn", - hwpoison_debug_fs); - hwpoison_inject_fd = checked_open(buf, O_WRONLY); - } - - if (opt_unpoison && !hwpoison_forget_fd) { - snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn", - hwpoison_debug_fs); - hwpoison_forget_fd = checked_open(buf, O_WRONLY); - } -} - -static int hwpoison_page(unsigned long offset) -{ - char buf[100]; - int len; - - len = sprintf(buf, "0x%lx\n", offset); - len = write(hwpoison_inject_fd, buf, len); - if (len < 0) { - perror("hwpoison inject"); - return len; - } - return 0; -} - -static int unpoison_page(unsigned long offset) -{ - char buf[100]; - int len; - - len = sprintf(buf, "0x%lx\n", offset); - len = write(hwpoison_forget_fd, buf, len); - if (len < 0) { - perror("hwpoison forget"); - return len; - } - 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 - */ - -static size_t hash_slot(uint64_t flags) -{ - size_t k = HASH_KEY(flags); - size_t 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 voffset, unsigned long offset, - uint64_t flags, uint64_t cgroup, uint64_t mapcnt, - uint64_t pme) -{ - flags = kpageflags_flags(flags, pme); - - if (!bit_mask_ok(flags)) - return; - - if (opt_cgroup && cgroup != (uint64_t)opt_cgroup) - return; - - if (opt_hwpoison) - hwpoison_page(offset); - 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) - show_page(voffset, offset, flags, cgroup, mapcnt); - - nr_pages[hash_slot(flags)]++; - total_pages++; -} - -#define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */ -static void walk_pfn(unsigned long voffset, - unsigned long index, - unsigned long count, - uint64_t pme) -{ - uint64_t buf[KPAGEFLAGS_BATCH]; - uint64_t cgi[KPAGEFLAGS_BATCH]; - uint64_t cnt[KPAGEFLAGS_BATCH]; - unsigned long batch; - unsigned long pages; - unsigned long i; - - /* - * kpagecgroup_read() reads only if kpagecgroup were opened, but - * /proc/kpagecgroup might even not exist, so it's better to fill - * them with zeros here. - */ - if (count == 1) - cgi[0] = 0; - else - memset(cgi, 0, sizeof cgi); - - while (count) { - batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH); - pages = kpageflags_read(buf, index, batch); - if (pages == 0) - break; - - if (kpagecgroup_read(cgi, index, pages) != pages) - fatal("kpagecgroup returned fewer pages than expected"); - - if (kpagecount_read(cnt, index, pages) != pages) - fatal("kpagecount returned fewer pages than expected"); - - for (i = 0; i < pages; i++) - add_page(voffset + i, index + i, - buf[i], cgi[i], cnt[i], pme); - - index += pages; - count -= pages; - } -} - -static void walk_swap(unsigned long voffset, uint64_t pme) -{ - uint64_t flags = kpageflags_flags(0, pme); - - if (!bit_mask_ok(flags)) - return; - - if (opt_cgroup) - return; - - if (opt_list == 1) - show_page_range(voffset, pagemap_swap_offset(pme), - 1, flags, 0, 0); - else if (opt_list == 2) - show_page(voffset, pagemap_swap_offset(pme), flags, 0, 0); - - nr_pages[hash_slot(flags)]++; - total_pages++; -} - -#define PAGEMAP_BATCH (64 << 10) -static void walk_vma(unsigned long index, unsigned long count) -{ - uint64_t buf[PAGEMAP_BATCH]; - unsigned long batch; - unsigned long pages; - unsigned long pfn; - unsigned long i; - - while (count) { - batch = min_t(unsigned long, count, PAGEMAP_BATCH); - pages = pagemap_read(buf, index, batch); - if (pages == 0) - break; - - for (i = 0; i < pages; i++) { - pfn = pagemap_pfn(buf[i]); - if (pfn) - walk_pfn(index + i, pfn, 1, buf[i]); - if (buf[i] & PM_SWAP) - walk_swap(index + i, buf[i]); - } - - index += pages; - count -= pages; - } -} - -static void walk_task(unsigned long index, unsigned long count) -{ - const unsigned long end = index + count; - unsigned long start; - int i = 0; - - while (index < end) { - - while (pg_end[i] <= index) - if (++i >= nr_vmas) - return; - if (pg_start[i] >= end) - return; - - start = max_t(unsigned long, pg_start[i], index); - index = min_t(unsigned long, pg_end[i], end); - - assert(start < index); - walk_vma(start, index - start); - } -} - -static void add_addr_range(unsigned long offset, unsigned long size) -{ - if (nr_addr_ranges >= MAX_ADDR_RANGES) - fatal("too many addr ranges\n"); - - opt_offset[nr_addr_ranges] = offset; - opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset); - nr_addr_ranges++; -} - -static void walk_addr_ranges(void) -{ - int i; - - kpageflags_fd = checked_open(opt_kpageflags, O_RDONLY); - - if (!nr_addr_ranges) - add_addr_range(0, ULONG_MAX); - - for (i = 0; i < nr_addr_ranges; i++) - if (!opt_pid) - walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0); - else - walk_task(opt_offset[i], opt_size[i]); - - if (opt_mark_idle) - mark_page_idle(0); - - 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) -{ - size_t i, j; - - printf( -"page-types [options]\n" -" -r|--raw Raw mode, for kernel developers\n" -" -d|--describe flags Describe flags\n" -" -a|--addr addr-spec Walk a range of pages\n" -" -b|--bits bits-spec Walk pages with specified bits\n" -" -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" -" -M|--list-mapcnt Show page map count\n" -" -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" -" anon bit-name, e.g.\n" -" 0x10,anon comma-separated list, e.g.\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-1\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) -{ - FILE *file; - char buf[5000]; - - opt_pid = parse_number(str); - - sprintf(buf, "/proc/%d/pagemap", opt_pid); - pagemap_fd = checked_open(buf, O_RDONLY); - - sprintf(buf, "/proc/%d/maps", opt_pid); - file = fopen(buf, "r"); - if (!file) { - perror(buf); - exit(EXIT_FAILURE); - } - - while (fgets(buf, sizeof(buf), file) != NULL) { - unsigned long vm_start; - unsigned long vm_end; - unsigned long long pgoff; - int major, minor; - char r, w, x, s; - unsigned long ino; - int n; - - n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu", - &vm_start, - &vm_end, - &r, &w, &x, &s, - &pgoff, - &major, &minor, - &ino); - if (n < 10) { - fprintf(stderr, "unexpected line: %s\n", buf); - continue; - } - pg_start[nr_vmas] = vm_start / page_size; - pg_end[nr_vmas] = vm_end / page_size; - if (++nr_vmas >= MAX_VMAS) { - fprintf(stderr, "too many VMAs\n"); - break; - } - } - fclose(file); -} - -static void show_file(const char *name, const struct stat *st) -{ - unsigned long long size = st->st_size; - char atime[64], mtime[64]; - long now = time(NULL); - - printf("%s\tInode: %u\tSize: %llu (%llu pages)\n", - name, (unsigned)st->st_ino, - size, (size + page_size - 1) / page_size); - - strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime)); - strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime)); - - printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n", - mtime, now - st->st_mtime, - atime, now - st->st_atime); -} - -static sigjmp_buf sigbus_jmp; - -static void * volatile sigbus_addr; - -static void sigbus_handler(int sig, siginfo_t *info, void *ucontex) -{ - (void)sig; - (void)ucontex; - sigbus_addr = info ? info->si_addr : NULL; - siglongjmp(sigbus_jmp, 1); -} - -static struct sigaction sigbus_action = { - .sa_sigaction = sigbus_handler, - .sa_flags = SA_SIGINFO, -}; - -static void walk_file_range(const char *name, int fd, - unsigned long off, unsigned long end) -{ - uint8_t vec[PAGEMAP_BATCH]; - uint64_t buf[PAGEMAP_BATCH], flags; - uint64_t cgroup = 0; - uint64_t mapcnt = 0; - unsigned long nr_pages, pfn, i; - ssize_t len; - void *ptr; - int first = 1; - - for (; off < end; off += len) { - nr_pages = (end - off + page_size - 1) / page_size; - if (nr_pages > PAGEMAP_BATCH) - nr_pages = PAGEMAP_BATCH; - len = nr_pages * page_size; - - ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off); - if (ptr == MAP_FAILED) - fatal("mmap failed: %s", name); - - /* determine cached pages */ - if (mincore(ptr, len, vec)) - fatal("mincore failed: %s", name); - - /* turn off readahead */ - if (madvise(ptr, len, MADV_RANDOM)) - fatal("madvice failed: %s", name); - - if (sigsetjmp(sigbus_jmp, 1)) { - end = off + sigbus_addr ? sigbus_addr - ptr : 0; - fprintf(stderr, "got sigbus at offset %lld: %s\n", - (long long)end, name); - goto got_sigbus; - } - - /* populate ptes */ - for (i = 0; i < nr_pages ; i++) { - if (vec[i] & 1) - (void)*(volatile int *)(ptr + i * page_size); - } -got_sigbus: - - /* turn off harvesting reference bits */ - if (madvise(ptr, len, MADV_SEQUENTIAL)) - fatal("madvice failed: %s", name); - - if (pagemap_read(buf, (unsigned long)ptr / page_size, - nr_pages) != nr_pages) - fatal("cannot read pagemap"); - - munmap(ptr, len); - - for (i = 0; i < nr_pages; i++) { - pfn = pagemap_pfn(buf[i]); - if (!pfn) - continue; - if (!kpageflags_read(&flags, pfn, 1)) - continue; - if (!kpagecgroup_read(&cgroup, pfn, 1)) - fatal("kpagecgroup_read failed"); - if (!kpagecount_read(&mapcnt, pfn, 1)) - fatal("kpagecount_read failed"); - if (first && opt_list) { - first = 0; - flush_page_range(); - } - add_page(off / page_size + i, pfn, - flags, cgroup, mapcnt, buf[i]); - } - } -} - -static void walk_file(const char *name, const struct stat *st) -{ - int i; - int fd; - - fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW); - - if (!nr_addr_ranges) - add_addr_range(0, st->st_size / page_size); - - for (i = 0; i < nr_addr_ranges; i++) - walk_file_range(name, fd, opt_offset[i] * page_size, - (opt_offset[i] + opt_size[i]) * page_size); - - close(fd); -} - -int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f) -{ - (void)f; - switch (type) { - case FTW_F: - if (S_ISREG(st->st_mode)) - walk_file(name, st); - break; - case FTW_DNR: - fprintf(stderr, "cannot read dir: %s\n", name); - break; - } - return 0; -} - -struct stat st; - -static void walk_page_cache(void) -{ - kpageflags_fd = checked_open(opt_kpageflags, O_RDONLY); - pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY); - sigaction(SIGBUS, &sigbus_action, NULL); - - if (stat(opt_file, &st)) - fatal("stat failed: %s\n", opt_file); - - if (S_ISREG(st.st_mode)) { - walk_file(opt_file, &st); - } else if (S_ISDIR(st.st_mode)) { - /* do not follow symlinks and mountpoints */ - if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0) - fatal("nftw failed: %s\n", opt_file); - } else - fatal("unhandled file type: %s\n", opt_file); - - close(kpageflags_fd); - close(pagemap_fd); - signal(SIGBUS, SIG_DFL); -} - -static void parse_file(const char *name) -{ - opt_file = name; -} - -static void parse_cgroup(const char *path) -{ - if (path[0] == '@') { - opt_cgroup = parse_number(path + 1); - return; - } - - struct stat st; - - if (stat(path, &st)) - fatal("stat failed: %s: %m\n", path); - - if (!S_ISDIR(st.st_mode)) - fatal("cgroup supposed to be a directory: %s\n", path); - - opt_cgroup = st.st_ino; -} - -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) -{ - size_t 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 void parse_kpageflags(const char *name) -{ - opt_kpageflags = name; -} - -static void describe_flags(const char *optarg) -{ - uint64_t flags = parse_flag_names(optarg, 0); - - printf("0x%016llx\t%s\t%s\n", - (unsigned long long)flags, - page_flag_name(flags), - page_flag_longname(flags)); -} - -static const struct option opts[] = { - { "raw" , 0, NULL, 'r' }, - { "pid" , 1, NULL, 'p' }, - { "file" , 1, NULL, 'f' }, - { "addr" , 1, NULL, 'a' }, - { "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' }, - { "list-mapcnt", 0, NULL, 'M' }, - { "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 } -}; - -int main(int argc, char *argv[]) -{ - int c; - |