procrank.c revision e16cb84e2324f05334d18dcf5956f20f44262b62 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <dirent.h>
18#include <errno.h>
19#include <stdlib.h>
20#include <sys/types.h>
21#include <unistd.h>
22
23#include <pagemap/pagemap.h>
24
25struct proc_info {
26    pid_t pid;
27    pm_memusage_t usage;
28    unsigned long wss;
29};
30
31static void usage(char *myname);
32static int getprocname(pid_t pid, char *buf, size_t len);
33static int numcmp(long long a, long long b);
34
35#define declare_sort(field) \
36    static int sort_by_ ## field (const void *a, const void *b)
37
38declare_sort(vss);
39declare_sort(rss);
40declare_sort(pss);
41declare_sort(uss);
42
43int (*compfn)(const void *a, const void *b);
44static int order;
45
46#define MAX_PROCS 256
47
48int main(int argc, char *argv[]) {
49    pm_kernel_t *ker;
50    pm_process_t *proc;
51    pid_t *pids;
52    struct proc_info *procs[MAX_PROCS];
53    size_t num_procs;
54    char cmdline[256];
55    int error;
56
57    #define WS_OFF   0
58    #define WS_ONLY  1
59    #define WS_RESET 2
60    int ws;
61
62    int i, j;
63
64    compfn = &sort_by_pss;
65    order = -1;
66    ws = WS_OFF;
67
68    for (i = 1; i < argc; i++) {
69        if (!strcmp(argv[i], "-v")) { compfn = &sort_by_vss; continue; }
70        if (!strcmp(argv[i], "-r")) { compfn = &sort_by_rss; continue; }
71        if (!strcmp(argv[i], "-p")) { compfn = &sort_by_pss; continue; }
72        if (!strcmp(argv[i], "-u")) { compfn = &sort_by_uss; continue; }
73        if (!strcmp(argv[i], "-w")) { ws = WS_ONLY; continue; }
74        if (!strcmp(argv[i], "-W")) { ws = WS_RESET; continue; }
75        if (!strcmp(argv[i], "-R")) { order *= -1; continue; }
76        if (!strcmp(argv[i], "-h")) { usage(argv[0]); exit(0); }
77        fprintf(stderr, "Invalid argument \"%s\".\n", argv[i]);
78        usage(argv[0]);
79        exit(EXIT_FAILURE);
80    }
81
82    error = pm_kernel_create(&ker);
83    if (error) {
84        fprintf(stderr, "Error creating kernel interface -- "
85                        "does this kernel have pagemap?\n");
86        exit(EXIT_FAILURE);
87    }
88
89    error = pm_kernel_pids(ker, &pids, &num_procs);
90    if (error) {
91        fprintf(stderr, "Error listing processes.\n");
92        exit(EXIT_FAILURE);
93    }
94
95    for (i = 0; i < num_procs; i++) {
96        procs[i] = malloc(sizeof(struct proc_info));
97        if (!procs[i]) {
98            fprintf(stderr, "malloc: %s\n", strerror(errno));
99            exit(EXIT_FAILURE);
100        }
101        procs[i]->pid = pids[i];
102        error = pm_process_create(ker, pids[i], &proc);
103        if (!error) {
104            switch (ws) {
105            case WS_OFF:
106                pm_process_usage(proc, &procs[i]->usage);
107                break;
108            case WS_ONLY:
109                pm_process_workingset(proc, &procs[i]->usage, 0);
110                break;
111            case WS_RESET:
112                pm_process_workingset(proc, NULL, 1);
113                break;
114            }
115            pm_process_destroy(proc);
116        } else {
117            fprintf(stderr, "warning: could not create process interface for %d\n", pids[i]);
118            pm_memusage_zero(&procs[i]->usage);
119        }
120    }
121
122    free(pids);
123
124    if (ws == WS_RESET) exit(0);
125
126    j = 0;
127    for (i = 0; i < num_procs; i++) {
128        if (procs[i]->usage.vss)
129            procs[j++] = procs[i];
130    }
131    num_procs = j;
132
133    qsort(procs, num_procs, sizeof(procs[0]), compfn);
134
135    if (ws)
136        printf("%5s  %7s  %7s  %7s  %s\n", "PID", "WRss", "WPss", "WUss", "cmdline");
137    else
138        printf("%5s  %7s  %7s  %7s  %7s  %s\n", "PID", "Vss", "Rss", "Pss", "Uss", "cmdline");
139    for (i = 0; i < num_procs; i++) {
140        getprocname(procs[i]->pid, cmdline, sizeof(cmdline));
141        if (ws)
142            printf("%5d  %6dK  %6dK  %6dK  %s\n",
143                procs[i]->pid,
144                procs[i]->usage.rss / 1024,
145                procs[i]->usage.pss / 1024,
146                procs[i]->usage.uss / 1024,
147                cmdline
148            );
149        else
150            printf("%5d  %6dK  %6dK  %6dK  %6dK  %s\n",
151                procs[i]->pid,
152                procs[i]->usage.vss / 1024,
153                procs[i]->usage.rss / 1024,
154                procs[i]->usage.pss / 1024,
155                procs[i]->usage.uss / 1024,
156                cmdline
157            );
158    }
159
160    return 0;
161}
162
163static void usage(char *myname) {
164    fprintf(stderr, "Usage: %s [ -W ] [ -v | -r | -p | -u | -h ]\n"
165                    "    -v  Sort by VSS.\n"
166                    "    -r  Sort by RSS.\n"
167                    "    -p  Sort by PSS.\n"
168                    "    -u  Sort by USS.\n"
169                    "        (Default sort order is PSS.)\n"
170                    "    -R  Reverse sort order (default is descending).\n"
171                    "    -w  Display statistics for working set only.\n"
172                    "    -W  Reset working set of all processes.\n"
173                    "    -h  Display this help screen.\n",
174    myname);
175}
176
177static int getprocname(pid_t pid, char *buf, size_t len) {
178    char filename[20];
179    FILE *f;
180
181    sprintf(filename, "/proc/%d/cmdline", pid);
182    f = fopen(filename, "r");
183    if (!f) { *buf = '\0'; return 1; }
184    if (!fgets(buf, len, f)) { *buf = '\0'; return 2; }
185    fclose(f);
186    return 0;
187}
188
189static int numcmp(long long a, long long b) {
190    if (a < b) return -1;
191    if (a > b) return 1;
192    return 0;
193}
194
195#define create_sort(field, compfn) \
196    static int sort_by_ ## field (const void *a, const void *b) { \
197        return order * compfn( \
198            (*((struct proc_info**)a))->usage.field, \
199            (*((struct proc_info**)b))->usage.field \
200        ); \
201    }
202
203create_sort(vss, numcmp)
204create_sort(rss, numcmp)
205create_sort(pss, numcmp)
206create_sort(uss, numcmp)
207