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pagemon.c
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/*
* Copyright (C) Colin Ian King 2015-2025
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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 have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdint.h>
#include <libgen.h>
#include <inttypes.h>
#include <unistd.h>
#include <time.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <signal.h>
#include <ncurses.h>
#include <dirent.h>
#include <libgen.h>
#include <ctype.h>
#include <setjmp.h>
#include "perf.h"
#define APP_NAME "pagemon"
#define MAX_MAPS (65536)
#define ADDR_OFFSET (17) /* Display x offset from address */
#define HEX_WIDTH (3) /* Width of each 2 hex digit value */
#define VIEW_PAGE (0) /* View pages in memory map */
#define VIEW_MEM (1) /* View memory in hex */
#define MIN_TICKS (1)
#define MAX_TICKS (1000)
#define MIN_ZOOM (1)
#define MAX_ZOOM (999)
#define MAXIMUM(a, b) ((a) > (b) ? (a) : (b))
#define MINIMUM(a, b) ((a) < (b) ? (a) : (b))
#define DEFAULT_UDELAY (15000) /* Delay between each refresh */
#define DEFAULT_TICKS (60) /* Ticks between dirty page checks */
#define PROCPATH_MAX (32) /* Size of proc pathnames */
#define BLINK_MASK (0x20) /* Cursor blink counter mask */
/*
* Memory size scaling
*/
#define KB (1024ULL)
#define MB (KB * KB)
#define GB (KB * KB * KB)
#define TB (KB * KB * KB * KB)
/*
* Error returns
*/
#define OK (0)
#define ERR_NO_MAP_INFO (-1)
#define ERR_NO_MEM_INFO (-2)
#define ERR_SMALL_WIN (-3)
#define ERR_ALLOC_NOMEM (-4)
#define ERR_TOO_MANY_PAGES (-5)
#define ERR_TOO_FEW_PAGES (-6)
#define ERR_RESIZE_FAIL (-7)
#define ERR_NO_PROCESS (-8)
#define ERR_FAULT (-9)
/*
* PTE bits from uint64_t in /proc/PID/pagemap
* for each mapped page
*/
#define PAGE_PTE_SOFT_DIRTY (1ULL << 55)
#define PAGE_EXCLUSIVE_MAPPED (1ULL << 56)
#define PAGE_FILE_SHARED_ANON (1ULL << 61)
#define PAGE_SWAPPED (1ULL << 62)
#define PAGE_PRESENT (1ULL << 63)
#define OPT_FLAG_READ_ALL_PAGES (0x00000001)
#define OPT_FLAG_PID (0x00000002)
enum {
WHITE_RED = 1,
WHITE_BLUE,
WHITE_YELLOW,
WHITE_CYAN,
WHITE_GREEN,
WHITE_BLACK,
RED_BLUE,
BLACK_WHITE,
BLACK_BLACK,
BLUE_WHITE,
};
/*
* Note that we use 64 bit addresses even for 32 bit systems since
* this allows pagemon to run in a 32 bit chroot and still access
* the 64 bit mapping info. Otherwise I'd use uintptr_t instead.
*/
typedef uint64_t addr_t; /* Addresses */
typedef int64_t index_t; /* Index into page tables */
typedef uint64_t pagemap_t; /* PTE page map bits */
typedef uint64_t checksum_t; /* Pagemap checksum */
/*
* Memory map info, represents 1 or more pages
*/
typedef struct {
addr_t begin; /* Start of mapping */
addr_t end; /* End of mapping */
char attr[5]; /* Map attributes */
char dev[6]; /* Map device, if any */
char name[NAME_MAX + 1]; /* Name of mapping */
} map_t;
/*
* Page info, 1 per page with map reference
* to the memory map it belongs to
*/
typedef struct {
addr_t addr; /* Address */
map_t *map; /* Mapping it is in */
index_t index; /* Index into map */
} page_t;
/*
* General memory mapping info, containing
* a fix set of memory maps, and pointer
* to an array of per page info.
*/
typedef struct {
map_t maps[MAX_MAPS]; /* Mappings */
uint32_t nmaps; /* Number of mappings */
page_t *pages; /* Pages */
addr_t npages; /* Number of pages */
addr_t last_addr; /* Last address */
} mem_info_t;
/*
* Cursor context, we have one each for the
* memory map and page contents views
*/
typedef struct {
int32_t xpos; /* Cursor x position */
int32_t ypos; /* Cursor y position */
int32_t xpos_prev; /* Previous x position */
int32_t ypos_prev; /* Previous y position */
int32_t ypos_max; /* Max y position */
int32_t xmax; /* Width */
int32_t ymax; /* Height */
} position_t;
/*
* Globals, stashed in a global struct
*/
typedef struct {
WINDOW *mainwin; /* curses main window */
sigjmp_buf env; /* terminate abort jmp */
addr_t max_pages; /* Max pages in system */
checksum_t checksum; /* Pagemap check sum */
checksum_t prev_checksum; /* Previous checksum */
uint32_t page_size; /* Page size in bytes */
pid_t pid; /* Process ID */
mem_info_t mem_info; /* Mapping and page info */
#if defined(PERF_ENABLED)
perf_t perf; /* Perf context */
#endif
bool curses_started; /* Are we in curses mode? */
bool tab_view; /* Page pop-up info */
bool vm_view; /* Process VM stats */
bool help_view; /* Help pop-up info */
bool resized; /* SIGWINCH occurred */
bool terminate; /* SIGSEGV termination */
bool auto_zoom; /* Automatic zoom */
#if defined(PERF_ENABLED)
bool perf_view; /* Perf statistics */
#endif
uint8_t view; /* Default page or memory view */
uint8_t opt_flags; /* User option flags */
char path_refs[PROCPATH_MAX]; /* /proc/$PID/clear_refs */
char path_pagemap[PROCPATH_MAX];/* /proc/$PID/pagemap */
char path_maps[PROCPATH_MAX]; /* /proc/$PID/maps */
char path_mem[PROCPATH_MAX]; /* /proc/$PID/mem */
char path_status[PROCPATH_MAX]; /* /proc/$PID/status */
char path_stat[PROCPATH_MAX]; /* /proc/$PID/stat */
char path_oom[PROCPATH_MAX]; /* /proc/$PID/oom_score */
} global_t;
static global_t g;
/*
* mem_to_str()
* report memory in different units
*/
static void mem_to_str(const addr_t addr, char *const buf, const size_t buflen)
{
uint64_t scaled, val = (uint64_t)addr;
char unit;
if (val < 99 * MB) {
scaled = val / KB;
unit = 'K';
} else if (val < 99 * GB) {
scaled = val / MB;
unit = 'M';
} else if (val < 99 * TB) {
scaled = val / GB;
unit = 'G';
} else {
scaled = val / TB;
unit = 'T';
}
(void)snprintf(buf, buflen, "%7" PRIu64 " %c", scaled, unit);
}
/*
* read_buf()
* read data into a buffer, just
* for one liner /proc file reading
*/
static int read_buf(
const char *path,
char *const buffer,
const size_t sz)
{
int fd;
ssize_t ret;
if ((fd = open(path, O_RDONLY)) < 0)
return -1;
ret = read(fd, buffer, sz);
(void)close(fd);
if ((ret < 1) || (ret > (ssize_t)sz))
return -1;
buffer[ret - 1] = '\0';
return 0;
}
/*
* proc_name_to_pid()
* find a process by name, return PID of
* first match found. Zero indicates error
*/
static pid_t proc_name_to_pid(char *const name)
{
char *ptr;
bool isnum = true;
DIR *dir;
struct dirent *d;
pid_t pid = 0;
/* Could be just a pid in numeric form */
for (ptr = name; *ptr; ptr++) {
if (!isdigit(*ptr)) {
isnum = false;
break;
}
}
if (isnum) {
pid = (pid_t)strtol(name, NULL, 10);
if (errno || (pid < 1)) {
(void)fprintf(stderr, "Invalid pid value '%s'\n", name);
return 0;
}
return pid;
}
/* No, search for process name */
dir = opendir("/proc");
if (!dir)
return pid;
while ((d = readdir(dir)) != NULL) {
char path[PATH_MAX], buf[4096], *bn;
if (!isdigit(d->d_name[0]))
continue;
(void)snprintf(path, sizeof(path), "/proc/%s/cmdline",
d->d_name);
if (read_buf(path, buf, sizeof(buf)) < 0)
continue;
bn = basename(buf);
if (!bn)
continue;
if (!strcmp(name, bn)) {
pid = (pid_t)strtol(d->d_name, NULL, 10);
if ((errno == 0) && (pid > 0))
break;
}
}
(void)closedir(dir);
if (!pid)
(void)fprintf(stderr, "Cannot find process '%s'\n", name);
return pid;
}
/*
* get_proc_self_stat_field()
* find nth field of /proc/$PID/stat data. This works around
* the problem that the comm field can contain spaces and
* multiple ) so sscanf on this field won't work. The returned
* pointer is the start of the Nth field and it is up to the
* caller to determine the end of the field
*/
static const char *get_proc_self_stat_field(const char *buf, const int num)
{
const char *ptr, *comm_end;
int n;
if (num < 1 || !buf || !*buf)
return NULL;
if (num == 1)
return buf;
if (num == 2)
return strstr(buf, "(");
comm_end = NULL;
for (ptr = buf; *ptr; ptr++) {
if (*ptr == ')')
comm_end = ptr;
}
if (!comm_end)
return NULL;
comm_end++;
n = num - 2;
ptr = comm_end;
while (*ptr) {
while (*ptr && *ptr == ' ')
ptr++;
n--;
if (n <= 0)
break;
while (*ptr && *ptr != ' ')
ptr++;
}
return ptr;
}
/*
* read_faults()
* read minor and major page faults
*/
static int read_faults(
uint64_t *const minor_flt,
uint64_t *const major_flt)
{
char buf[4096];
const char *ptr;
*minor_flt = 0;
*major_flt = 0;
if (read_buf(g.path_stat, buf, sizeof(buf)) < 0)
return -1;
ptr = get_proc_self_stat_field(buf, 10);
if (!ptr)
return -1;
if (sscanf(ptr, "%" SCNu64 " %*u %" SCNu64, minor_flt, major_flt) != 2)
return -1;
return 0;
}
/*
* read_oom_score()
* read the process oom score
*/
static int read_oom_score(uint64_t *const score)
{
char buf[4096];
*score = ~0ULL;
if (read_buf(g.path_oom, buf, sizeof(buf)) < 0)
return -1;
if (sscanf(buf, "%" SCNu64, score) != 1)
return -1;
return 0;
}
/*
* read_maps()
* read memory maps for a specific process
*/
static int read_maps(const bool force)
{
FILE *fp;
uint32_t i, j, n = 0;
char buffer[4096];
page_t *page;
checksum_t checksum = 0ULL;
map_t *map;
g.mem_info.npages = 0;
g.mem_info.last_addr = 0;
if (kill(g.pid, 0) < 0)
return ERR_NO_PROCESS;
if (force)
g.prev_checksum = 0;
fp = fopen(g.path_maps, "r");
if (fp == NULL)
return ERR_NO_MAP_INFO;
map = g.mem_info.maps;
while (fgets(buffer, sizeof(buffer), fp) != NULL) {
int ret;
intptr_t length;
map->name[0] = '\0';
ret = sscanf(buffer, "%" SCNx64 "-%" SCNx64
" %5s %*s %6s %*d %s",
&map->begin,
&map->end,
map->attr,
map->dev,
map->name);
if ((ret != 5) && (ret != 4))
continue;
if (ret == 4)
map->name[0]= '\0';
/* Simple sanity check */
if (map->end < map->begin)
continue;
length = map->end - map->begin;
/* Check for overflow */
if (g.mem_info.npages + length < g.mem_info.npages)
continue;
if (g.mem_info.last_addr < map->end)
g.mem_info.last_addr = map->end;
checksum ^= map->begin;
checksum <<= 1;
checksum ^= map->end;
checksum <<= 1;
checksum ^= map->attr[0];
checksum <<= 1;
checksum ^= map->attr[1];
checksum <<= 1;
checksum ^= map->attr[2];
checksum <<= 1;
checksum ^= map->attr[3];
checksum <<= 1;
checksum ^= length;
g.mem_info.npages += length / g.page_size;
n++;
map++;
if (n >= MAX_MAPS)
break;
}
(void)fclose(fp);
checksum += g.mem_info.npages;
checksum += n;
g.checksum = checksum;
/* No change in maps, so nothing to do */
if (g.checksum == g.prev_checksum)
return OK;
g.prev_checksum = checksum;
/* Unlikely, but need to keep Coverity Scan happy */
if (g.mem_info.npages > g.max_pages)
return ERR_TOO_MANY_PAGES;
if (g.mem_info.npages == 0)
return ERR_TOO_FEW_PAGES;
free(g.mem_info.pages);
g.mem_info.nmaps = n;
g.mem_info.pages = calloc(g.mem_info.npages, sizeof(page_t));
if (!g.mem_info.pages) {
g.mem_info.nmaps = 0;
return ERR_ALLOC_NOMEM;
}
map = g.mem_info.maps;
page = g.mem_info.pages;
for (i = 0; i < g.mem_info.nmaps; i++, map++) {
addr_t addr = map->begin;
addr_t count = (map->end - map->begin) / g.page_size;
for (j = 0; j < count; j++, page++) {
page->addr = addr;
page->map = map;
page->index = i;
addr += g.page_size;
}
}
return (n == 0) ? ERR_NO_MAP_INFO : OK;
}
/*
* handle_winch()
* handle SIGWINCH, flag a window resize
*/
static void handle_winch(int sig)
{
(void)sig;
g.resized = true;
}
/*
* handle_terminate()
* handle termination signals
*/
static void handle_terminate(int sig)
{
static bool already_handled = false;
(void)sig;
if (already_handled)
exit(EXIT_FAILURE);
g.terminate = true;
siglongjmp(g.env, 1);
}
/*
* show_usage()
* mini help info
*/
static void show_usage(void)
{
(void)printf(APP_NAME ", version " VERSION "\n\n"
"Usage: " APP_NAME " [options]\n"
" -a enable automatic zoom mode\n"
" -d delay in microseconds between refreshes, "
"default %u\n"
" -h help\n"
" -p pid process ID to monitor\n"
" -r read (page back in) pages at start\n"
" -t ticks ticks between dirty page checks\n"
" -v enable VM view\n"
" -z zoom set page zoom scale\n",
DEFAULT_UDELAY);
}
#if defined(PERF_ENABLED)
/*
* show_perf()
* show perf stats
*/
static void show_perf(void)
{
int y = LINES - 6;
const int x = 2;
static uint8_t perf_ticker = 0;
/* Don't hammer perf to death */
if (++perf_ticker > 10) {
perf_stop(&g.perf);
perf_start(&g.perf, g.pid);
perf_ticker = 0;
}
(void)wattrset(g.mainwin, COLOR_PAIR(WHITE_CYAN) | A_BOLD);
(void)mvwprintw(g.mainwin, y + 0, x,
" Page Faults (User Space): %15" PRIu64 " ",
perf_counter(&g.perf, PERF_TP_PAGE_FAULT_USER));
(void)mvwprintw(g.mainwin, y + 1, x,
" Page Faults (Kernel Space): %15" PRIu64 " ",
perf_counter(&g.perf, PERF_TP_PAGE_FAULT_KERNEL));
(void)mvwprintw(g.mainwin, y + 2, x,
" Kernel Page Allocate: %15" PRIu64 " ",
perf_counter(&g.perf, PERF_TP_MM_PAGE_ALLOC));
(void)mvwprintw(g.mainwin, y + 3, x,
" Kernel Page Free: %15" PRIu64 " ",
perf_counter(&g.perf, PERF_TP_MM_PAGE_FREE));
}
#endif
/*
* show_vm()
* show Virtual Memory stats
*/
static void show_vm(void)
{
FILE *fp;
char buffer[4096];
int y = 2;
const int x = COLS - 26;
uint64_t major, minor, score;
fp = fopen(g.path_status, "r");
if (fp == NULL)
return;
(void)wattrset(g.mainwin, COLOR_PAIR(WHITE_BLUE) | A_BOLD);
while (fgets(buffer, sizeof(buffer), fp) != NULL) {
char vmname[9], size[8];
char state[6], longstate[13];
uint64_t sz;
if (sscanf(buffer, "State: %5s %12s", state, longstate) == 2) {
(void)mvwprintw(g.mainwin, y++, x,
" State: %-12.12s ", longstate);
continue;
}
if (sscanf(buffer, "Vm%8s %" SCNu64 "%7s",
vmname, &sz, size) == 3) {
(void)mvwprintw(g.mainwin, y++, x,
" Vm%-6.6s %10" PRIu64 " %s ",
vmname, sz, size);
continue;
}
}
(void)fclose(fp);
if (!read_faults(&minor, &major)) {
(void)mvwprintw(g.mainwin, y++, x, " %-23s", "Page Faults:");
(void)mvwprintw(g.mainwin, y++, x,
" Minor: %12" PRIu64 " ", minor);
(void)mvwprintw(g.mainwin, y++, x,
" Major: %12" PRIu64 " ", major);
}
if (!read_oom_score(&score)) {
(void)mvwprintw(g.mainwin, y, x,
" OOM Score: %8" PRIu64 " ", score);
}
}
/*
* show_page_bits()
* show info based on the page bit pattern
*/
static void show_page_bits(
const int fd,
map_t *const map,
const index_t idx)
{
pagemap_t pagemap_info;
off_t offset;
char buf[16];
const int x = 2;
int kfd;
mem_to_str(map->end - map->begin, buf, sizeof(buf) - 1);
(void)wattrset(g.mainwin, COLOR_PAIR(WHITE_BLUE) | A_BOLD);
(void)mvwprintw(g.mainwin, 2, x,
" Page: 0x%16.16" PRIx64 "%18s",
g.mem_info.pages[idx].addr, "");
(void)mvwprintw(g.mainwin, 3, x,
" Page Size: 0x%8.8" PRIx32 " bytes%20s",
g.page_size, "");
(void)mvwprintw(g.mainwin, 4, x,
" Map: 0x%16.16" PRIx64 "-%16.16" PRIx64 " ",
map->begin, map->end - 1);
(void)mvwprintw(g.mainwin, 5, x,
" Map Size: %s%27s", buf, "");
(void)mvwprintw(g.mainwin, 6, x,
" Device: %5.5s%31s",
map->dev, "");
(void)mvwprintw(g.mainwin, 7, x,
" Prot: %4.4s%32s",
map->attr, "");
(void)mvwprintw(g.mainwin, 8, x,
" Map Name: %-35.35s ", map->name[0] == '\0' ?
"[Anonymous]" : basename(map->name));
offset = sizeof(pagemap_t) *
(g.mem_info.pages[idx].addr / g.page_size);
if (lseek(fd, offset, SEEK_SET) == (off_t)-1)
return;
if (read(fd, &pagemap_info, sizeof(pagemap_info)) != sizeof(pagemap_info))
return;
(void)mvwprintw(g.mainwin, 9, x,
" Flag: 0x%16.16" PRIx64 "%18s", pagemap_info, "");
if (pagemap_info & PAGE_SWAPPED) {
(void)mvwprintw(g.mainwin, 10, x,
" Swap Type: 0x%2.2" PRIx64 "%22s",
pagemap_info & 0x1f, "");
(void)mvwprintw(g.mainwin, 11, x,
" Swap Offset: 0x%16.16" PRIx64 "%8s",
(uint64_t)(pagemap_info & 0x00ffffffffffffffULL) >> 5, "");
} else {
(void)mvwprintw(g.mainwin, 10, x, "%48s", "");
if (pagemap_info & PAGE_PRESENT) {
(void)mvwprintw(g.mainwin, 11, x,
" Physical Address: 0x%16.16" PRIx64 "%8s",
(uint64_t)(pagemap_info & 0x00ffffffffffffffULL) * g.page_size, "");
} else {
(void)mvwprintw(g.mainwin, 11, x,
" Physical Address: 0x----------------%8s", "");
}
}
(void)mvwprintw(g.mainwin, 12, x,
" Soft-dirty PTE: %3s%23s",
(pagemap_info & PAGE_PTE_SOFT_DIRTY) ? "Yes" : "No ", "");
(void)mvwprintw(g.mainwin, 13, x,
" Exclusively Mapped: %3s%23s",
(pagemap_info & PAGE_EXCLUSIVE_MAPPED) ? "Yes" : "No ", "");
(void)mvwprintw(g.mainwin, 14, x,
" File or Shared Anon: %3s%23s",
(pagemap_info & PAGE_FILE_SHARED_ANON) ? "Yes" : "No ", "");
(void)mvwprintw(g.mainwin, 15, x,
" Present in Swap: %3s%23s",
(pagemap_info & PAGE_SWAPPED) ? "Yes" : "No ", "");
(void)mvwprintw(g.mainwin, 16, x,
" Present in RAM: %3s%23s",
(pagemap_info & PAGE_PRESENT) ? "Yes" : "No ", "");
kfd = open("/proc/kpagecount", O_RDONLY);
if (kfd > -1) {
uint64_t count;
offset = sizeof(count) *
(pagemap_info & 0x00ffffffffffffffULL);
if (lseek(kfd, offset, SEEK_SET) == (off_t)-1)
goto close_kfd;
if (read(kfd, &count, sizeof(count)) != sizeof(count))
goto close_kfd;
(void)mvwprintw(g.mainwin, 16, x,
" KPageCount: %-10" PRIu64 "%13s", count, "");
close_kfd:
(void)close(kfd);
}
}
/*
* banner()
* clear a banner across the window
*/
static inline void banner(const int y)
{
(void)mvwprintw(g.mainwin, y, 0, "%*s", COLS, "");
}
/*
* show_pages()
* show page mapping
*/
static int show_pages(
const index_t cursor_index,
const index_t page_index,
const position_t *const p,
const int32_t zoom)
{
int32_t i;
index_t idx;
const uint32_t shift = ((uint32_t)(8 * sizeof(pagemap_t) - 4 -
__builtin_clzll((g.page_size))));
int fd;
map_t *map;
const int32_t xmax = p->xmax, ymax = p->ymax;
pagemap_t pagemap_info_buf[xmax];
if ((fd = open(g.path_pagemap, O_RDONLY)) < 0)
return ERR_NO_MAP_INFO;
idx = page_index;
for (i = 1; i <= ymax; i++) {
int32_t j;
addr_t addr, offset;
const size_t sz = sizeof(pagemap_info_buf);
if (idx >= (index_t)g.mem_info.npages) {
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_BLACK));
(void)mvwprintw(g.mainwin, i, 0, "---------------- ");
} else {
addr = g.mem_info.pages[idx].addr;
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_WHITE));
(void)mvwprintw(g.mainwin, i, 0, "%16.16" PRIx64 " ", addr);
}
/*
* Slurp up an entire row
*/
(void)memset(pagemap_info_buf, 0, sz);
if (idx >= (index_t)g.mem_info.npages) {
map = NULL;
} else {
addr = g.mem_info.pages[idx].addr;
map = g.mem_info.pages[idx].map;
offset = (addr >> shift) & ~7ULL;
if (lseek(fd, offset, SEEK_SET) != (off_t)-1) {
ssize_t ret = read(fd, pagemap_info_buf, sz);
(void)ret;
}
}
for (j = 0; j < xmax; j++) {
char state = '.';
int attr;
if (idx >= (index_t)g.mem_info.npages) {
attr = COLOR_PAIR(BLACK_BLACK);
state = '~';
} else {
map_t *new_map;
register pagemap_t pagemap_info;
new_map = g.mem_info.pages[idx].map;
/*
* On a different mapping? If so, slurp up
* the new mappings from here to end
*/
if (new_map != map) {
map = new_map;
addr = g.mem_info.pages[idx].addr;
offset = (addr >> shift) & ~7;
if (lseek(fd, offset, SEEK_SET) == (off_t)-1)
break;
if (read(fd, &pagemap_info_buf[j],
(xmax - j) * sizeof(pagemap_t)) < 0)
break;
}
__builtin_prefetch(&g.mem_info.pages[idx + zoom].addr, 1, 1);
pagemap_info = pagemap_info_buf[j];
attr = COLOR_PAIR(BLACK_WHITE);
if (pagemap_info & PAGE_PRESENT) {
attr = COLOR_PAIR(WHITE_YELLOW);
state = 'P';
}
if (pagemap_info & PAGE_SWAPPED) {
attr = COLOR_PAIR(WHITE_GREEN);
state = 'S';
}
if (pagemap_info & PAGE_FILE_SHARED_ANON) {
attr = COLOR_PAIR(WHITE_RED);
state = 'M';
}
if (pagemap_info & PAGE_PTE_SOFT_DIRTY) {
attr = COLOR_PAIR(WHITE_CYAN);
state = 'D';
}
idx += zoom;
}
(void)wattrset(g.mainwin, attr);
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET + j, "%c", state);
}
}
(void)wattrset(g.mainwin, A_NORMAL);
map = g.mem_info.pages[cursor_index].map;
if (map && g.tab_view)
show_page_bits(fd, map, cursor_index);
if (g.vm_view)
show_vm();
#if defined(PERF_ENABLED)
if (g.perf_view)
show_perf();
#endif
(void)close(fd);
return 0;
}
/*
* show_memory()
* show memory contents
*/
static int show_memory(
const index_t page_index,
index_t data_index,
const position_t *const p)
{
addr_t addr;
index_t idx = page_index;
int32_t i;
const int32_t xmax = p->xmax, ymax = p->ymax;
int fd;
if ((fd = open(g.path_mem, O_RDONLY)) < 0)
return ERR_NO_MEM_INFO;
for (i = 1; i <= ymax; i++) {
int32_t j;
uint8_t bytes[xmax];
ssize_t nread = 0;
addr = g.mem_info.pages[idx].addr + data_index;
if (lseek(fd, (off_t)addr, SEEK_SET) == (off_t)-1) {
nread = -1;
} else {
nread = read(fd, bytes, (size_t)xmax);
if (nread < 0)
nread = -1;
}
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_WHITE));
if (idx >= (index_t)g.mem_info.npages)
(void)mvwprintw(g.mainwin, i, 0, "---------------- ");
else
(void)mvwprintw(g.mainwin, i, 0, "%16.16" PRIx64 " ", addr);
(void)mvwprintw(g.mainwin, i, COLS - 3, " ");
for (j = 0; j < xmax; j++) {
uint8_t byte;
addr = g.mem_info.pages[idx].addr + data_index;
if ((idx >= (index_t)g.mem_info.npages) ||
(addr > g.mem_info.last_addr)) {
/* End of memory */
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_BLACK));
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET +
(HEX_WIDTH * j), " ");
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET +
(HEX_WIDTH * xmax) + j, " ");
goto do_border;
}
if (j > nread) {
/* Failed to read data */
(void)wattrset(g.mainwin, COLOR_PAIR(WHITE_BLUE));
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET +
(HEX_WIDTH * j), "?? ");
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_WHITE));
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET +
(HEX_WIDTH * xmax) + j, "?");
goto do_border;
}
/* We have some legimate data to display */
byte = bytes[j];
(void)wattrset(g.mainwin, COLOR_PAIR(WHITE_BLUE));
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET +
(HEX_WIDTH * j), "%2.2" PRIx8 " ", byte);
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_WHITE));
byte &= 0x7f;
(void)mvwprintw(g.mainwin, i, ADDR_OFFSET +
(HEX_WIDTH * xmax) + j, "%c",
(byte < 32 || byte > 126) ? '.' : byte);
do_border:
(void)wattrset(g.mainwin, COLOR_PAIR(BLACK_WHITE));
(void)mvwprintw(g.mainwin, i, 16 + (HEX_WIDTH * xmax), " ");
data_index++;
if (data_index >= g.page_size) {
data_index -= g.page_size;
idx++;
}
}
}
(void)close(fd);
return 0;
}
/*
* read_all_pages()
* read in all pages into memory, this
* will force swapped out pages back into
* memory
*/
static int read_all_pages(void)
{
int fd;
index_t idx;
if ((fd = open(g.path_mem, O_RDONLY)) < 0)
return ERR_NO_MEM_INFO;
for (idx = 0; idx < (index_t)g.mem_info.npages; idx++) {
const off_t addr = g.mem_info.pages[idx].addr;
uint8_t byte;
if (lseek(fd, addr, SEEK_SET) == (off_t)-1)
continue;