/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dirent.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <pagemap/pagemap.h>
struct proc_info {
pid_t pid;
pm_memusage_t usage;
unsigned long wss;
};
static void usage(char *myname);
static int getprocname(pid_t pid, char *buf, int len);
static int numcmp(long long a, long long b);
#define declare_sort(field) \
static int sort_by_ ## field (const void *a, const void *b)
declare_sort(vss);
declare_sort(rss);
declare_sort(pss);
declare_sort(uss);
int (*compfn)(const void *a, const void *b);
static int order;
int main(int argc, char *argv[]) {
pm_kernel_t *ker;
pm_process_t *proc;
pid_t *pids;
struct proc_info **procs;
size_t num_procs;
char cmdline[256]; // this must be within the range of int
int error;
#define WS_OFF 0
#define WS_ONLY 1
#define WS_RESET 2
int ws;
int arg;
size_t i, j;
compfn = &sort_by_pss;
order = -1;
ws = WS_OFF;
for (arg = 1; arg < argc; arg++) {
if (!strcmp(argv[arg], "-v")) { compfn = &sort_by_vss; continue; }
if (!strcmp(argv[arg], "-r")) { compfn = &sort_by_rss; continue; }
if (!strcmp(argv[arg], "-p")) { compfn = &sort_by_pss; continue; }
if (!strcmp(argv[arg], "-u")) { compfn = &sort_by_uss; continue; }
if (!strcmp(argv[arg], "-w")) { ws = WS_ONLY; continue; }
if (!strcmp(argv[arg], "-W")) { ws = WS_RESET; continue; }
if (!strcmp(argv[arg], "-R")) { order *= -1; continue; }
if (!strcmp(argv[arg], "-h")) { usage(argv[0]); exit(0); }
fprintf(stderr, "Invalid argument \"%s\".\n", argv[arg]);
usage(argv[0]);
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);
}
error = pm_kernel_pids(ker, &pids, &num_procs);
if (error) {
fprintf(stderr, "Error listing processes.\n");
exit(EXIT_FAILURE);
}
procs = calloc(num_procs, sizeof(struct proc_info*));
if (procs == NULL) {
fprintf(stderr, "calloc: %s", strerror(errno));
exit(EXIT_FAILURE);
}
for (i = 0; i < num_procs; i++) {
procs[i] = malloc(sizeof(struct proc_info));
if (procs[i] == NULL) {
fprintf(stderr, "malloc: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
procs[i]->pid = pids[i];
error = pm_process_create(ker, pids[i], &proc);
if (!error) {
switch (ws) {
case WS_OFF:
pm_process_usage(proc, &procs[i]->usage);
break;
case WS_ONLY:
pm_process_workingset(proc, &procs[i]->usage, 0);
break;
case WS_RESET:
pm_process_workingset(proc, NULL, 1);
break;
}
pm_process_destroy(proc);
} else {
fprintf(stderr, "warning: could not create process interface for %d\n", pids[i]);
pm_memusage_zero(&procs[i]->usage);
}
}
free(pids);
if (ws == WS_RESET) exit(0);
j = 0;
for (i = 0; i < num_procs; i++) {
if (procs[i]->usage.vss) {
procs[j++] = procs[i];
} else {
free(procs[i]);
}
}
num_procs = j;
qsort(procs, num_procs, sizeof(procs[0]), compfn);
if (ws)
printf("%5s %7s %7s %7s %s\n", "PID", "WRss", "WPss", "WUss", "cmdline");
else
printf("%5s %7s %7s %7s %7s %s\n", "PID", "Vss", "Rss", "Pss", "Uss", "cmdline");
for (i = 0; i < num_procs; i++) {
if (getprocname(procs[i]->pid, cmdline, (int)sizeof(cmdline)) < 0) {
/*
* Something is probably seriously wrong if writing to the stack
* failed.
*/
free(procs[i]);
continue;
}
if (ws)
printf("%5d %6dK %6dK %6dK %s\n",
procs[i]->pid,
procs[i]->usage.rss / 1024,
procs[i]->usage.pss / 1024,
procs[i]->usage.uss / 1024,
cmdline
);
else
printf("%5d %6dK %6dK %6dK %6dK %s\n",
procs[i]->pid,
procs[i]->usage.vss / 1024,
procs[i]->usage.rss / 1024,
procs[i]->usage.pss / 1024,
procs[i]->usage.uss / 1024,
cmdline
);
free(procs[i]);
}
free(procs);
return 0;
}
static void usage(char *myname) {
fprintf(stderr, "Usage: %s [ -W ] [ -v | -r | -p | -u | -h ]\n"
" -v Sort by VSS.\n"
" -r Sort by RSS.\n"
" -p Sort by PSS.\n"
" -u Sort by USS.\n"
" (Default sort order is PSS.)\n"
" -R Reverse sort order (default is descending).\n"
" -w Display statistics for working set only.\n"
" -W Reset working set of all processes.\n"
" -h Display this help screen.\n",
myname);
}
/*
* Get the process name for a given PID. Inserts the process name into buffer
* buf of length len. The size of the buffer must be greater than zero to get
* any useful output.
*
* Note that fgets(3) only declares length as an int, so our buffer size is
* also declared as an int.
*
* Returns 0 on success, a positive value on partial success, and -1 on
* failure. Other interesting values:
* 1 on failure to create string to examine proc cmdline entry
* 2 on failure to open proc cmdline entry
* 3 on failure to read proc cmdline entry
*/
static int getprocname(pid_t pid, char *buf, int len) {
char *filename;
FILE *f;
int rc = 0;
static const char* unknown_cmdline = "<unknown>";
if (len <= 0) {
return -1;
}
if (asprintf(&filename, "/proc/%zd/cmdline", pid) < 0) {
rc = 1;
goto exit;
}
f = fopen(filename, "r");
if (f == NULL) {
rc = 2;
goto releasefilename;
}
if (fgets(buf, len, f) == NULL) {
rc = 3;
goto closefile;
}
closefile:
(void) fclose(f);
releasefilename:
free(filename);
exit:
if (rc != 0) {
/*
* The process went away before we could read its process name. Try
* to give the user "<unknown>" here, but otherwise they get to look
* at a blank.
*/
if (strlcpy(buf, unknown_cmdline, (size_t)len) >= (size_t)len) {
rc = 4;
}
}
return rc;
}
static int numcmp(long long a, long long b) {
if (a < b) return -1;
if (a > b) return 1;
return 0;
}
#define create_sort(field, compfn) \
static int sort_by_ ## field (const void *a, const void *b) { \
return order * compfn( \
(*((struct proc_info**)a))->usage.field, \
(*((struct proc_info**)b))->usage.field \
); \
}
create_sort(vss, numcmp)
create_sort(rss, numcmp)
create_sort(pss, numcmp)
create_sort(uss, numcmp)