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pagemap: add page-types tool
Add page-types, a handy tool for querying page flags. It will expand some of the overloaded flags: PG_slob_free = PG_private PG_slub_frozen = PG_active PG_slub_debug = PG_error PG_readahead = PG_reclaim and mask out obscure flags except in -raw mode: PG_reserved PG_mlocked PG_mappedtodisk PG_private PG_private_2 PG_owner_priv_1 PG_arch_1 PG_uncached PG_compound* for non hugeTLB pages [akpm@linux-foundation.org: fix warning] Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Matt Mackall <mpm@selenic.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wu Fengguang
Linus Torvalds
parent
17e895012f
commit
35efa5e993
2 changed files with 699 additions and 1 deletions
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@ -2,7 +2,7 @@
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obj- := dummy.o
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# List of programs to build
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hostprogs-y := slabinfo
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hostprogs-y := slabinfo slqbinfo page-types
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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698
Documentation/vm/page-types.c
Normal file
698
Documentation/vm/page-types.c
Normal file
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@ -0,0 +1,698 @@
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/*
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* page-types: Tool for querying page flags
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*
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* Copyright (C) 2009 Intel corporation
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* Copyright (C) 2009 Wu Fengguang <fengguang.wu@intel.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <string.h>
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#include <getopt.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/errno.h>
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#include <sys/fcntl.h>
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/*
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* kernel page flags
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*/
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#define KPF_BYTES 8
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#define PROC_KPAGEFLAGS "/proc/kpageflags"
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/* copied from kpageflags_read() */
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#define KPF_LOCKED 0
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#define KPF_ERROR 1
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#define KPF_REFERENCED 2
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#define KPF_UPTODATE 3
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#define KPF_DIRTY 4
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#define KPF_LRU 5
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#define KPF_ACTIVE 6
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#define KPF_SLAB 7
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#define KPF_WRITEBACK 8
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#define KPF_RECLAIM 9
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#define KPF_BUDDY 10
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/* [11-20] new additions in 2.6.31 */
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#define KPF_MMAP 11
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#define KPF_ANON 12
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#define KPF_SWAPCACHE 13
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#define KPF_SWAPBACKED 14
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#define KPF_COMPOUND_HEAD 15
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#define KPF_COMPOUND_TAIL 16
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#define KPF_HUGE 17
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#define KPF_UNEVICTABLE 18
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#define KPF_NOPAGE 20
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/* [32-] kernel hacking assistances */
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#define KPF_RESERVED 32
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#define KPF_MLOCKED 33
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#define KPF_MAPPEDTODISK 34
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#define KPF_PRIVATE 35
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#define KPF_PRIVATE_2 36
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#define KPF_OWNER_PRIVATE 37
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#define KPF_ARCH 38
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#define KPF_UNCACHED 39
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/* [48-] take some arbitrary free slots for expanding overloaded flags
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* not part of kernel API
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*/
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#define KPF_READAHEAD 48
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#define KPF_SLOB_FREE 49
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#define KPF_SLUB_FROZEN 50
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#define KPF_SLUB_DEBUG 51
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#define KPF_ALL_BITS ((uint64_t)~0ULL)
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#define KPF_HACKERS_BITS (0xffffULL << 32)
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#define KPF_OVERLOADED_BITS (0xffffULL << 48)
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#define BIT(name) (1ULL << KPF_##name)
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#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
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static char *page_flag_names[] = {
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[KPF_LOCKED] = "L:locked",
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[KPF_ERROR] = "E:error",
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[KPF_REFERENCED] = "R:referenced",
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[KPF_UPTODATE] = "U:uptodate",
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[KPF_DIRTY] = "D:dirty",
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[KPF_LRU] = "l:lru",
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[KPF_ACTIVE] = "A:active",
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[KPF_SLAB] = "S:slab",
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[KPF_WRITEBACK] = "W:writeback",
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[KPF_RECLAIM] = "I:reclaim",
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[KPF_BUDDY] = "B:buddy",
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[KPF_MMAP] = "M:mmap",
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[KPF_ANON] = "a:anonymous",
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[KPF_SWAPCACHE] = "s:swapcache",
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[KPF_SWAPBACKED] = "b:swapbacked",
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[KPF_COMPOUND_HEAD] = "H:compound_head",
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[KPF_COMPOUND_TAIL] = "T:compound_tail",
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[KPF_HUGE] = "G:huge",
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[KPF_UNEVICTABLE] = "u:unevictable",
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[KPF_NOPAGE] = "n:nopage",
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[KPF_RESERVED] = "r:reserved",
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[KPF_MLOCKED] = "m:mlocked",
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[KPF_MAPPEDTODISK] = "d:mappedtodisk",
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[KPF_PRIVATE] = "P:private",
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[KPF_PRIVATE_2] = "p:private_2",
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[KPF_OWNER_PRIVATE] = "O:owner_private",
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[KPF_ARCH] = "h:arch",
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[KPF_UNCACHED] = "c:uncached",
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[KPF_READAHEAD] = "I:readahead",
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[KPF_SLOB_FREE] = "P:slob_free",
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[KPF_SLUB_FROZEN] = "A:slub_frozen",
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[KPF_SLUB_DEBUG] = "E:slub_debug",
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};
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/*
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* data structures
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*/
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static int opt_raw; /* for kernel developers */
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static int opt_list; /* list pages (in ranges) */
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static int opt_no_summary; /* don't show summary */
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static pid_t opt_pid; /* process to walk */
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#define MAX_ADDR_RANGES 1024
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static int nr_addr_ranges;
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static unsigned long opt_offset[MAX_ADDR_RANGES];
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static unsigned long opt_size[MAX_ADDR_RANGES];
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#define MAX_BIT_FILTERS 64
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static int nr_bit_filters;
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static uint64_t opt_mask[MAX_BIT_FILTERS];
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static uint64_t opt_bits[MAX_BIT_FILTERS];
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static int page_size;
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#define PAGES_BATCH (64 << 10) /* 64k pages */
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static int kpageflags_fd;
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static uint64_t kpageflags_buf[KPF_BYTES * PAGES_BATCH];
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#define HASH_SHIFT 13
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#define HASH_SIZE (1 << HASH_SHIFT)
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#define HASH_MASK (HASH_SIZE - 1)
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#define HASH_KEY(flags) (flags & HASH_MASK)
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static unsigned long total_pages;
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static unsigned long nr_pages[HASH_SIZE];
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static uint64_t page_flags[HASH_SIZE];
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/*
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* helper functions
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*/
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#define min_t(type, x, y) ({ \
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type __min1 = (x); \
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type __min2 = (y); \
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__min1 < __min2 ? __min1 : __min2; })
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unsigned long pages2mb(unsigned long pages)
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{
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return (pages * page_size) >> 20;
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}
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void fatal(const char *x, ...)
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{
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va_list ap;
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va_start(ap, x);
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vfprintf(stderr, x, ap);
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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/*
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* page flag names
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*/
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char *page_flag_name(uint64_t flags)
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{
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static char buf[65];
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int present;
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int i, j;
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for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
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present = (flags >> i) & 1;
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if (!page_flag_names[i]) {
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if (present)
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fatal("unkown flag bit %d\n", i);
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continue;
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}
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buf[j++] = present ? page_flag_names[i][0] : '_';
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}
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return buf;
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}
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char *page_flag_longname(uint64_t flags)
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{
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static char buf[1024];
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int i, n;
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for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
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if (!page_flag_names[i])
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continue;
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if ((flags >> i) & 1)
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n += snprintf(buf + n, sizeof(buf) - n, "%s,",
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page_flag_names[i] + 2);
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}
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if (n)
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n--;
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buf[n] = '\0';
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return buf;
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}
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/*
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* page list and summary
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*/
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void show_page_range(unsigned long offset, uint64_t flags)
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{
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static uint64_t flags0;
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static unsigned long index;
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static unsigned long count;
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if (flags == flags0 && offset == index + count) {
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count++;
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return;
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}
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if (count)
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printf("%lu\t%lu\t%s\n",
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index, count, page_flag_name(flags0));
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flags0 = flags;
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index = offset;
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count = 1;
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}
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void show_page(unsigned long offset, uint64_t flags)
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{
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printf("%lu\t%s\n", offset, page_flag_name(flags));
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}
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void show_summary(void)
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{
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int i;
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printf(" flags\tpage-count MB"
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" symbolic-flags\t\t\tlong-symbolic-flags\n");
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for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
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if (nr_pages[i])
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printf("0x%016llx\t%10lu %8lu %s\t%s\n",
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(unsigned long long)page_flags[i],
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nr_pages[i],
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pages2mb(nr_pages[i]),
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page_flag_name(page_flags[i]),
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page_flag_longname(page_flags[i]));
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}
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printf(" total\t%10lu %8lu\n",
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total_pages, pages2mb(total_pages));
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}
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/*
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* page flag filters
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*/
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int bit_mask_ok(uint64_t flags)
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{
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int i;
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for (i = 0; i < nr_bit_filters; i++) {
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if (opt_bits[i] == KPF_ALL_BITS) {
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if ((flags & opt_mask[i]) == 0)
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return 0;
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} else {
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if ((flags & opt_mask[i]) != opt_bits[i])
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return 0;
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}
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}
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return 1;
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}
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uint64_t expand_overloaded_flags(uint64_t flags)
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{
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/* SLOB/SLUB overload several page flags */
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if (flags & BIT(SLAB)) {
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if (flags & BIT(PRIVATE))
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flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
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if (flags & BIT(ACTIVE))
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flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
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if (flags & BIT(ERROR))
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flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
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}
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/* PG_reclaim is overloaded as PG_readahead in the read path */
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if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
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flags ^= BIT(RECLAIM) | BIT(READAHEAD);
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return flags;
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}
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uint64_t well_known_flags(uint64_t flags)
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{
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/* hide flags intended only for kernel hacker */
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flags &= ~KPF_HACKERS_BITS;
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/* hide non-hugeTLB compound pages */
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if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
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flags &= ~BITS_COMPOUND;
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return flags;
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}
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/*
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* page frame walker
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*/
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int hash_slot(uint64_t flags)
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{
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int k = HASH_KEY(flags);
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int i;
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/* Explicitly reserve slot 0 for flags 0: the following logic
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* cannot distinguish an unoccupied slot from slot (flags==0).
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*/
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if (flags == 0)
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return 0;
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/* search through the remaining (HASH_SIZE-1) slots */
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for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
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if (!k || k >= ARRAY_SIZE(page_flags))
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k = 1;
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if (page_flags[k] == 0) {
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page_flags[k] = flags;
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return k;
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}
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if (page_flags[k] == flags)
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return k;
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}
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fatal("hash table full: bump up HASH_SHIFT?\n");
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exit(EXIT_FAILURE);
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}
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void add_page(unsigned long offset, uint64_t flags)
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{
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flags = expand_overloaded_flags(flags);
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if (!opt_raw)
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flags = well_known_flags(flags);
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if (!bit_mask_ok(flags))
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return;
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if (opt_list == 1)
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show_page_range(offset, flags);
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else if (opt_list == 2)
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show_page(offset, flags);
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nr_pages[hash_slot(flags)]++;
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total_pages++;
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}
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void walk_pfn(unsigned long index, unsigned long count)
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{
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unsigned long batch;
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unsigned long n;
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unsigned long i;
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if (index > ULONG_MAX / KPF_BYTES)
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fatal("index overflow: %lu\n", index);
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lseek(kpageflags_fd, index * KPF_BYTES, SEEK_SET);
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while (count) {
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batch = min_t(unsigned long, count, PAGES_BATCH);
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n = read(kpageflags_fd, kpageflags_buf, batch * KPF_BYTES);
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if (n == 0)
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break;
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if (n < 0) {
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perror(PROC_KPAGEFLAGS);
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exit(EXIT_FAILURE);
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}
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if (n % KPF_BYTES != 0)
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fatal("partial read: %lu bytes\n", n);
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n = n / KPF_BYTES;
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for (i = 0; i < n; i++)
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add_page(index + i, kpageflags_buf[i]);
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index += batch;
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count -= batch;
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}
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}
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void walk_addr_ranges(void)
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{
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int i;
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kpageflags_fd = open(PROC_KPAGEFLAGS, O_RDONLY);
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if (kpageflags_fd < 0) {
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perror(PROC_KPAGEFLAGS);
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exit(EXIT_FAILURE);
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}
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if (!nr_addr_ranges)
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walk_pfn(0, ULONG_MAX);
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for (i = 0; i < nr_addr_ranges; i++)
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walk_pfn(opt_offset[i], opt_size[i]);
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close(kpageflags_fd);
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}
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/*
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* user interface
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*/
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const char *page_flag_type(uint64_t flag)
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{
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if (flag & KPF_HACKERS_BITS)
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return "(r)";
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if (flag & KPF_OVERLOADED_BITS)
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return "(o)";
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return " ";
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}
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void usage(void)
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{
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int i, j;
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printf(
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"page-types [options]\n"
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" -r|--raw Raw mode, for kernel developers\n"
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" -a|--addr addr-spec Walk a range of pages\n"
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" -b|--bits bits-spec Walk pages with specified bits\n"
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#if 0 /* planned features */
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" -p|--pid pid Walk process address space\n"
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" -f|--file filename Walk file address space\n"
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#endif
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" -l|--list Show page details in ranges\n"
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" -L|--list-each Show page details one by one\n"
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" -N|--no-summary Don't show summay info\n"
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" -h|--help Show this usage message\n"
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"addr-spec:\n"
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" N one page at offset N (unit: pages)\n"
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" N+M pages range from N to N+M-1\n"
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" N,M pages range from N to M-1\n"
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" N, pages range from N to end\n"
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" ,M pages range from 0 to M\n"
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"bits-spec:\n"
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" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
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" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
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" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
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" =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");
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
void parse_pid(const char *str)
|
||||
{
|
||||
opt_pid = parse_number(str);
|
||||
}
|
||||
|
||||
void parse_file(const char *name)
|
||||
{
|
||||
}
|
||||
|
||||
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++;
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
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++;
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
|
||||
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;
|
||||
}
|
||||
Loading…
Reference in a new issue