procrank.c revision 44ed630233afb3f334bf6e21f95027a3bf19971e 
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
46int main(int argc, char *argv[]) {
47    pm_kernel_t *ker;
48    pm_process_t *proc;
49    pid_t *pids;
50    struct proc_info **procs;
51    size_t num_procs;
52    char cmdline[256];
53    int error;
54
55    #define WS_OFF   0
56    #define WS_ONLY  1
57    #define WS_RESET 2
58    int ws;
59
60    int i, j;
61
62    compfn = &sort_by_pss;
63    order = -1;
64    ws = WS_OFF;
65
66    for (i = 1; i < argc; i++) {
67        if (!strcmp(argv[i], "-v")) { compfn = &sort_by_vss; continue; }
68        if (!strcmp(argv[i], "-r")) { compfn = &sort_by_rss; continue; }
69        if (!strcmp(argv[i], "-p")) { compfn = &sort_by_pss; continue; }
70        if (!strcmp(argv[i], "-u")) { compfn = &sort_by_uss; continue; }
71        if (!strcmp(argv[i], "-w")) { ws = WS_ONLY; continue; }
72        if (!strcmp(argv[i], "-W")) { ws = WS_RESET; continue; }
73        if (!strcmp(argv[i], "-R")) { order *= -1; continue; }
74        if (!strcmp(argv[i], "-h")) { usage(argv[0]); exit(0); }
75        fprintf(stderr, "Invalid argument \"%s\".\n", argv[i]);
76        usage(argv[0]);
77        exit(EXIT_FAILURE);
78    }
79
80    error = pm_kernel_create(&ker);
81    if (error) {
82        fprintf(stderr, "Error creating kernel interface -- "
83                        "does this kernel have pagemap?\n");
84        exit(EXIT_FAILURE);
85    }
86
87    error = pm_kernel_pids(ker, &pids, &num_procs);
88    if (error) {
89        fprintf(stderr, "Error listing processes.\n");
90        exit(EXIT_FAILURE);
91    }
92
93    procs = malloc(num_procs * sizeof(struct proc_info*));
94    if (!procs) {
95        fprintf(stderr, "malloc: %s\n", strerror(errno));
96        exit(EXIT_FAILURE);
97    }
98
99    for (i = 0; i < num_procs; i++) {
100        procs[i] = malloc(sizeof(struct proc_info));
101        if (!procs[i]) {
102            fprintf(stderr, "malloc: %s\n", strerror(errno));
103            exit(EXIT_FAILURE);
104        }
105        procs[i]->pid = pids[i];
106        error = pm_process_create(ker, pids[i], &proc);
107        if (!error) {
108            switch (ws) {
109            case WS_OFF:
110                pm_process_usage(proc, &procs[i]->usage);
111                break;
112            case WS_ONLY:
113                pm_process_workingset(proc, &procs[i]->usage, 0);
114                break;
115            case WS_RESET:
116                pm_process_workingset(proc, NULL, 1);
117                break;
118            }
119            pm_process_destroy(proc);
120        } else {
121            fprintf(stderr, "warning: could not create process interface for %d\n", pids[i]);
122            pm_memusage_zero(&procs[i]->usage);
123        }
124    }
125
126    free(pids);
127
128    if (ws == WS_RESET) exit(0);
129
130    j = 0;
131    for (i = 0; i < num_procs; i++) {
132        if (procs[i]->usage.vss)
133            procs[j++] = procs[i];
134    }
135    num_procs = j;
136
137    qsort(procs, num_procs, sizeof(procs[0]), compfn);
138
139    if (ws)
140        printf("%5s  %7s  %7s  %7s  %s\n", "PID", "WRss", "WPss", "WUss", "cmdline");
141    else
142        printf("%5s  %7s  %7s  %7s  %7s  %s\n", "PID", "Vss", "Rss", "Pss", "Uss", "cmdline");
143    for (i = 0; i < num_procs; i++) {
144        getprocname(procs[i]->pid, cmdline, sizeof(cmdline));
145        if (ws)
146            printf("%5d  %6dK  %6dK  %6dK  %s\n",
147                procs[i]->pid,
148                procs[i]->usage.rss / 1024,
149                procs[i]->usage.pss / 1024,
150                procs[i]->usage.uss / 1024,
151                cmdline
152            );
153        else
154            printf("%5d  %6dK  %6dK  %6dK  %6dK  %s\n",
155                procs[i]->pid,
156                procs[i]->usage.vss / 1024,
157                procs[i]->usage.rss / 1024,
158                procs[i]->usage.pss / 1024,
159                procs[i]->usage.uss / 1024,
160                cmdline
161            );
162    }
163
164    return 0;
165}
166
167static void usage(char *myname) {
168    fprintf(stderr, "Usage: %s [ -W ] [ -v | -r | -p | -u | -h ]\n"
169                    "    -v  Sort by VSS.\n"
170                    "    -r  Sort by RSS.\n"
171                    "    -p  Sort by PSS.\n"
172                    "    -u  Sort by USS.\n"
173                    "        (Default sort order is PSS.)\n"
174                    "    -R  Reverse sort order (default is descending).\n"
175                    "    -w  Display statistics for working set only.\n"
176                    "    -W  Reset working set of all processes.\n"
177                    "    -h  Display this help screen.\n",
178    myname);
179}
180
181static int getprocname(pid_t pid, char *buf, size_t len) {
182    char filename[20];
183    FILE *f;
184
185    sprintf(filename, "/proc/%d/cmdline", pid);
186    f = fopen(filename, "r");
187    if (!f) { *buf = '\0'; return 1; }
188    if (!fgets(buf, len, f)) { *buf = '\0'; return 2; }
189    fclose(f);
190    return 0;
191}
192
193static int numcmp(long long a, long long b) {
194    if (a < b) return -1;
195    if (a > b) return 1;
196    return 0;
197}
198
199#define create_sort(field, compfn) \
200    static int sort_by_ ## field (const void *a, const void *b) { \
201        return order * compfn( \
202            (*((struct proc_info**)a))->usage.field, \
203            (*((struct proc_info**)b))->usage.field \
204        ); \
205    }
206
207create_sort(vss, numcmp)
208create_sort(rss, numcmp)
209create_sort(pss, numcmp)
210create_sort(uss, numcmp)
211