static int read_pages(struct ksm_pages *kp, pm_map_t **maps, size_t num_maps, uint8_t pr_flags) {
size_t i, j, k;
size_t len;
uint64_t *pagemap;
size_t map_len;
uint64_t flags;
pm_kernel_t *ker;
int error;
unsigned long vaddr;
int fd;
off_t off;
char filename[MAX_FILENAME];
uint32_t *data;
uint32_t hash;
int rc = 0;
struct ksm_page *cur_page;
pid_t pid;
if (num_maps == 0)
return 0;
pid = pm_process_pid(maps[0]->proc);
ker = maps[0]->proc->ker;
error = snprintf(filename, MAX_FILENAME, "/proc/%d/mem", pid);
if (error < 0 || error >= MAX_FILENAME) {
return -1;
}
data = malloc(pm_kernel_pagesize(ker));
if (data == NULL) {
fprintf(stderr, "warning: not enough memory to malloc data buffer\n");
return -1;
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "warning: could not open %s\n", filename);
rc = -1;
goto err_open;
}
for (i = 0; i < num_maps; i++) {
error = pm_map_pagemap(maps[i], &pagemap, &map_len);
if (error) {
fprintf(stderr, "warning: could not read the pagemap of %d\n",
pm_process_pid(maps[i]->proc));
continue;
}
for (j = 0; j < map_len; j++) {
error = pm_kernel_flags(ker, PM_PAGEMAP_PFN(pagemap[j]), &flags);
if (error) {
fprintf(stderr, "warning: could not read flags for pfn at address 0x%016" PRIx64 "\n",
pagemap[i]);
continue;
}
if (!(flags & PM_PAGE_KSM)) {
continue;
}
vaddr = pm_map_start(maps[i]) + j * pm_kernel_pagesize(ker);
off = lseek(fd, vaddr, SEEK_SET);
if (off == (off_t)-1) {
fprintf(stderr, "warning: could not lseek to 0x%08lx\n", vaddr);
continue;
}
len = read(fd, data, pm_kernel_pagesize(ker));
if (len != pm_kernel_pagesize(ker)) {
fprintf(stderr, "warning: could not read page at 0x%08lx\n", vaddr);
continue;
}
hash = hashword(data, pm_kernel_pagesize(ker) / sizeof(*data), 17);
for (k = 0; k < kp->len; k++) {
if (kp->pages[k].hash == hash) break;
}
if (k == kp->len) {
if (kp->len == kp->size) {
struct ksm_page *tmp = realloc(kp->pages,
(kp->size + GROWTH_FACTOR) * sizeof(*kp->pages));
if (tmp == NULL) {
fprintf(stderr, "warning: not enough memory to realloc pages struct\n");
free(pagemap);
rc = -1;
goto err_realloc;
}
memset(&tmp[k], 0, sizeof(tmp[k]) * GROWTH_FACTOR);
kp->pages = tmp;
kp->size += GROWTH_FACTOR;
}
rc = pm_kernel_count(ker, PM_PAGEMAP_PFN(pagemap[j]), &kp->pages[kp->len].count);
if (rc) {
fprintf(stderr, "error reading page count\n");
free(pagemap);
goto err_count;
}
kp->pages[kp->len].hash = hash;
kp->pages[kp->len].pattern =
is_pattern((uint8_t *)data, pm_kernel_pagesize(ker)) ?
(data[0] & 0xFF) : NO_PATTERN;
kp->len++;
}
cur_page = &kp->pages[k];
if (pr_flags & PR_VERBOSE) {
if (cur_page->vaddr_len > 0 &&
cur_page->vaddr[cur_page->vaddr_len - 1].pid == pid &&
cur_page->vaddr[cur_page->vaddr_len - 1].addr ==
vaddr - (cur_page->vaddr[cur_page->vaddr_len - 1].num_pages *
pm_kernel_pagesize(ker))) {
cur_page->vaddr[cur_page->vaddr_len - 1].num_pages++;
} else {
if (cur_page->vaddr_len == cur_page->vaddr_size) {
struct vaddr *tmp = realloc(cur_page->vaddr,
(cur_page->vaddr_size + GROWTH_FACTOR) * sizeof(*(cur_page->vaddr)));
if (tmp == NULL) {
fprintf(stderr, "warning: not enough memory to realloc vaddr array\n");
free(pagemap);
rc = -1;
goto err_realloc;
}
memset(&tmp[cur_page->vaddr_len], 0, sizeof(tmp[cur_page->vaddr_len]) * GROWTH_FACTOR);
cur_page->vaddr = tmp;
cur_page->vaddr_size += GROWTH_FACTOR;
}
cur_page->vaddr[cur_page->vaddr_len].addr = vaddr;
cur_page->vaddr[cur_page->vaddr_len].num_pages = 1;
cur_page->vaddr[cur_page->vaddr_len].pid = pid;
cur_page->vaddr_len++;
}
}
cur_page->vaddr_count++;
}
free(pagemap);
}
goto no_err;
err_realloc:
err_count:
if (pr_flags & PR_VERBOSE) {
for (i = 0; i < kp->len; i++) {
free(kp->pages[i].vaddr);
}
}
free(kp->pages);
no_err:
close(fd);
err_open:
free(data);
return rc;
}
int main(int argc, char *argv[]) {
pid_t pid;
/* libpagemap context */
pm_kernel_t *ker;
int pagesize; /* cached for speed */
pm_process_t *proc;
/* maps and such */
pm_map_t **maps; int num_maps;
struct map_info **mis;
struct map_info *mi;
/* pagemap information */
uint64_t *pagemap; int num_pages;
unsigned long address; uint64_t mapentry;
uint64_t count, flags;
/* totals */
unsigned long total_shared_clean, total_shared_dirty, total_private_clean, total_private_dirty;
pm_memusage_t total_usage;
/* command-line options */
int ws;
#define WS_OFF (0)
#define WS_ONLY (1)
#define WS_RESET (2)
int (*compfn)(const void *a, const void *b);
int hide_zeros;
/* temporary variables */
int i, j;
char *endptr;
int error;
if (argc < 2) {
usage(argv[0]);
exit(EXIT_FAILURE);
}
ws = WS_OFF;
compfn = NULL;
hide_zeros = 0;
for (i = 1; i < argc - 1; i++) {
if (!strcmp(argv[i], "-w")) { ws = WS_ONLY; continue; }
if (!strcmp(argv[i], "-W")) { ws = WS_RESET; continue; }
if (!strcmp(argv[i], "-m")) { compfn = NULL; continue; }
if (!strcmp(argv[i], "-p")) { compfn = &comp_pss; continue; }
if (!strcmp(argv[i], "-h")) { hide_zeros = 1; continue; }
fprintf(stderr, "Invalid argument \"%s\".\n", argv[i]);
usage(argv[0]);
exit(EXIT_FAILURE);
}
pid = (pid_t)strtol(argv[argc - 1], &endptr, 10);
if (*endptr != '\0') {
fprintf(stderr, "Invalid PID \"%s\".\n", argv[argc - 1]);
exit(EXIT_FAILURE);
}
error = pm_kernel_create(&ker);
if (error) {
fprintf(stderr, "error creating kernel interface -- "
"does this kernel have pagemap?\n");
exit(EXIT_FAILURE);
}
pagesize = pm_kernel_pagesize(ker);
error = pm_process_create(ker, pid, &proc);
if (error) {
fprintf(stderr, "error creating process interface -- "
"does process %d really exist?\n", pid);
exit(EXIT_FAILURE);
}
if (ws == WS_RESET) {
error = pm_process_workingset(proc, NULL, 1);
if (error) {
fprintf(stderr, "error resetting working set for process.\n");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
/* get maps, and allocate our map_info array */
error = pm_process_maps(proc, &maps, &num_maps);
if (error) {
fprintf(stderr, "error listing maps.\n");
exit(EXIT_FAILURE);
}
mis = (struct map_info **)calloc(num_maps, sizeof(struct map_info *));
if (!mis) {
fprintf(stderr, "error allocating map_info array: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
/* print header */
if (ws == WS_ONLY) {
printf("%7s %7s %7s %7s %7s %7s %7s %s\n",
"WRss", "WPss", "WUss", "WShCl", "WShDi", "WPrCl", "WPrDi", "Name");
printf("%7s %7s %7s %7s %7s %7s %7s %s\n",
"-------", "-------", "-------", "-------", "-------", "-------", "-------", "");
} else {
printf("%7s %7s %7s %7s %7s %7s %7s %7s %s\n",
"Vss", "Rss", "Pss", "Uss", "ShCl", "ShDi", "PrCl", "PrDi", "Name");
printf("%7s %7s %7s %7s %7s %7s %7s %7s %s\n",
"-------", "-------", "-------", "-------", "-------", "-------", "-------", "-------", "");
}
/* zero things */
pm_memusage_zero(&total_usage);
total_shared_clean = total_shared_dirty = total_private_clean = total_private_dirty = 0;
for (i = 0; i < num_maps; i++) {
mi = (struct map_info *)calloc(1, sizeof(struct map_info));
if (!mi) {
fprintf(stderr, "error allocating map_info: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
mi->map = maps[i];
/* get, and sum, memory usage */
if (ws == WS_ONLY)
error = pm_map_workingset(mi->map, &mi->usage);
else
error = pm_map_usage(mi->map, &mi->usage);
if (error) {
fflush(stdout);
fprintf(stderr, "error getting usage for map.\n");
continue;
}
pm_memusage_add(&total_usage, &mi->usage);
/* get, and sum, individual page counts */
error = pm_map_pagemap(mi->map, &pagemap, &num_pages);
if (error) {
fflush(stdout);
fprintf(stderr, "error getting pagemap for map.\n");
continue;
}
mi->shared_clean = mi->shared_dirty = mi->private_clean = mi->private_dirty = 0;
for (j = 0; j < num_pages; j++) {
address = pm_map_start(mi->map) + j * ker->pagesize;
mapentry = pagemap[j];
if (PM_PAGEMAP_PRESENT(mapentry) && !PM_PAGEMAP_SWAPPED(mapentry)) {
error = pm_kernel_count(ker, PM_PAGEMAP_PFN(mapentry), &count);
if (error) {
fflush(stdout);
fprintf(stderr, "error getting count for frame.\n");
}
error = pm_kernel_flags(ker, PM_PAGEMAP_PFN(mapentry), &flags);
if (error) {
fflush(stdout);
fprintf(stderr, "error getting flags for frame.\n");
}
if ((ws != WS_ONLY) || (flags & PM_PAGE_REFERENCED)) {
if (count > 1) {
if (flags & PM_PAGE_DIRTY)
mi->shared_dirty++;
else
mi->shared_clean++;
} else {
if (flags & PM_PAGE_DIRTY)
mi->private_dirty++;
else
mi->private_clean++;
}
}
}
}
total_shared_clean += mi->shared_clean;
total_shared_dirty += mi->shared_dirty;
total_private_clean += mi->private_clean;
total_private_dirty += mi->private_dirty;
/* add to array */
mis[i] = mi;
}
/* sort the array, if requested (compfn == NULL for original order) */
if (compfn)
qsort(mis, num_maps, sizeof(mis[0]), compfn);
for (i = 0; i < num_maps; i++) {
mi = mis[i];
if ((!mi) || (hide_zeros && !mi->usage.rss))
continue;
if (ws == WS_ONLY) {
printf("%6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %s\n",
(long)mi->usage.rss / 1024,
(long)mi->usage.pss / 1024,
(long)mi->usage.uss / 1024,
mi->shared_clean * pagesize / 1024,
mi->shared_dirty * pagesize / 1024,
mi->private_clean * pagesize / 1024,
mi->private_dirty * pagesize / 1024,
pm_map_name(mi->map)
);
} else {
printf("%6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %s\n",
(long)mi->usage.vss / 1024,
(long)mi->usage.rss / 1024,
(long)mi->usage.pss / 1024,
(long)mi->usage.uss / 1024,
mi->shared_clean * pagesize / 1024,
mi->shared_dirty * pagesize / 1024,
mi->private_clean * pagesize / 1024,
mi->private_dirty * pagesize / 1024,
pm_map_name(mi->map)
);
}
}
/* print totals */
if (ws == WS_ONLY) {
printf("%7s %7s %7s %7s %7s %7s %7s %s\n",
"-------", "-------", "-------", "-------", "-------", "-------", "-------", "");
printf("%6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %s\n",
(long)total_usage.rss / 1024,
(long)total_usage.pss / 1024,
(long)total_usage.uss / 1024,
total_shared_clean * pagesize / 1024,
total_shared_dirty * pagesize / 1024,
total_private_clean * pagesize / 1024,
total_private_dirty * pagesize / 1024,
"TOTAL"
);
} else {
printf("%7s %7s %7s %7s %7s %7s %7s %7s %s\n",
"-------", "-------", "-------", "-------", "-------", "-------", "-------", "-------", "");
printf("%6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %6ldK %s\n",
(long)total_usage.vss / 1024,
(long)total_usage.rss / 1024,
(long)total_usage.pss / 1024,
(long)total_usage.uss / 1024,
total_shared_clean * pagesize / 1024,
total_shared_dirty * pagesize / 1024,
total_private_clean * pagesize / 1024,
total_private_dirty * pagesize / 1024,
"TOTAL"
);
}
return 0;
}