pmap: new applet. +1k.
pmap is a tool used to look at processes' memory maps, normally found in procps package. It provides more readable and easily sortable output (one line per mapping) from maps/smaps files in /proc/PID/. This would help in debugging memory usage issues, especially on devices where lots of typing is not a viable option. This patch does'n implement -d and -A command line options of GNU pmap, since those are not that must have features and I was afraid of going blind from looking at its code. The implementation takes smaps scanning part out of procps_scan() function and moves it into procps_read_smaps(), which does more detailed processing of a single PID's smaps data. Signed-off-by: Alexander Shishkin <virtuoso@slind.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Alexander Shishkin
Denys Vlasenko
parent
74c992af5c
commit
0834a6d3b9
@ -1387,6 +1387,29 @@ enum { COMM_LEN = TASK_COMM_LEN };
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enum { COMM_LEN = 16 };
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# endif
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#endif
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struct smaprec {
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unsigned long mapped_rw;
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unsigned long mapped_ro;
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unsigned long shared_clean;
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unsigned long shared_dirty;
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unsigned long private_clean;
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unsigned long private_dirty;
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unsigned long stack;
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unsigned long smap_pss, smap_swap;
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unsigned long smap_size;
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unsigned long smap_start;
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char smap_mode[5];
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char *smap_name;
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};
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#if !ENABLE_PMAP
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#define procps_read_smaps(pid, total, cb, data) \
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procps_read_smaps(pid, total)
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#endif
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int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
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void (*cb)(struct smaprec *, void *), void *data);
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typedef struct procps_status_t {
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DIR *dir;
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IF_FEATURE_SHOW_THREADS(DIR *task_dir;)
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@ -1415,13 +1438,7 @@ typedef struct procps_status_t {
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#endif
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unsigned tty_major,tty_minor;
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#if ENABLE_FEATURE_TOPMEM
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unsigned long mapped_rw;
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unsigned long mapped_ro;
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unsigned long shared_clean;
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unsigned long shared_dirty;
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unsigned long private_clean;
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unsigned long private_dirty;
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unsigned long stack;
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struct smaprec smaps;
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#endif
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char state[4];
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/* basename of executable in exec(2), read from /proc/N/stat
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160
libbb/procps.c
160
libbb/procps.c
@ -137,12 +137,9 @@ static unsigned long fast_strtoul_16(char **endptr)
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*endptr = str; /* We skip trailing space! */
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return n;
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}
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/* TOPMEM uses fast_strtoul_10, so... */
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# undef ENABLE_FEATURE_FAST_TOP
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# define ENABLE_FEATURE_FAST_TOP 1
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#endif
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#if ENABLE_FEATURE_FAST_TOP
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#if ENABLE_FEATURE_FAST_TOP || ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
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/* We cut a lot of corners here for speed */
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static unsigned long fast_strtoul_10(char **endptr)
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{
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@ -177,6 +174,111 @@ static char *skip_fields(char *str, int count)
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}
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#endif
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#if ENABLE_FEATURE_TOPMEM || ENABLE_PMAP
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int FAST_FUNC procps_read_smaps(pid_t pid, struct smaprec *total,
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void (*cb)(struct smaprec *, void *), void *data)
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{
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FILE *file;
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struct smaprec currec;
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char filename[sizeof("/proc/%u/smaps") + sizeof(int)*3];
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char buf[PROCPS_BUFSIZE];
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#if !ENABLE_PMAP
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void (*cb)(struct smaprec *, void *) = NULL;
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void *data = NULL;
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#endif
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sprintf(filename, "/proc/%u/smaps", (int)pid);
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file = fopen_for_read(filename);
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if (!file)
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return 1;
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memset(&currec, 0, sizeof(currec));
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while (fgets(buf, PROCPS_BUFSIZE, file)) {
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// Each mapping datum has this form:
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// f7d29000-f7d39000 rw-s ADR M:m OFS FILE
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// Size: nnn kB
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// Rss: nnn kB
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// .....
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char *tp = buf, *p;
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#define SCAN(S, X) \
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if (strncmp(tp, S, sizeof(S)-1) == 0) { \
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tp = skip_whitespace(tp + sizeof(S)-1); \
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total->X += currec.X = fast_strtoul_10(&tp); \
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continue; \
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}
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if (cb) {
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SCAN("Pss:" , smap_pss );
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SCAN("Swap:" , smap_swap );
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}
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SCAN("Private_Dirty:", private_dirty);
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SCAN("Private_Clean:", private_clean);
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SCAN("Shared_Dirty:" , shared_dirty );
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SCAN("Shared_Clean:" , shared_clean );
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#undef SCAN
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tp = strchr(buf, '-');
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if (tp) {
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// We reached next mapping - the line of this form:
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// f7d29000-f7d39000 rw-s ADR M:m OFS FILE
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if (cb) {
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/* If we have a previous record, there's nothing more
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* for it, call the callback and clear currec
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*/
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if (currec.smap_size)
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cb(&currec, data);
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free(currec.smap_name);
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}
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memset(&currec, 0, sizeof(currec));
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*tp = ' ';
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tp = buf;
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currec.smap_start = fast_strtoul_16(&tp);
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currec.smap_size = (fast_strtoul_16(&tp) - currec.smap_start) >> 10;
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strncpy(currec.smap_mode, tp, sizeof(currec.smap_mode)-1);
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// skipping "rw-s ADR M:m OFS "
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tp = skip_whitespace(skip_fields(tp, 4));
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// filter out /dev/something (something != zero)
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if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
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if (currec.smap_mode[1] == 'w') {
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currec.mapped_rw = currec.smap_size;
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total->mapped_rw += currec.smap_size;
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} else if (currec.smap_mode[1] == '-') {
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currec.mapped_ro = currec.smap_size;
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total->mapped_ro += currec.smap_size;
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}
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}
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if (strcmp(tp, "[stack]\n") == 0)
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total->stack += currec.smap_size;
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if (cb) {
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p = skip_non_whitespace(tp);
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if (p == tp) {
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currec.smap_name = xstrdup(" [ anon ]");
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} else {
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*p = '\0';
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currec.smap_name = xstrdup(tp);
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}
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}
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total->smap_size += currec.smap_size;
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}
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}
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fclose(file);
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if (cb) {
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if (currec.smap_size)
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cb(&currec, data);
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free(currec.smap_name);
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}
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return 0;
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}
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#endif
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void BUG_comm_size(void);
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procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
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{
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@ -365,54 +467,8 @@ procps_status_t* FAST_FUNC procps_scan(procps_status_t* sp, int flags)
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}
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#if ENABLE_FEATURE_TOPMEM
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if (flags & (PSSCAN_SMAPS)) {
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FILE *file;
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strcpy(filename_tail, "smaps");
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file = fopen_for_read(filename);
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if (file) {
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while (fgets(buf, sizeof(buf), file)) {
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unsigned long sz;
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char *tp;
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char w;
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#define SCAN(str, name) \
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if (strncmp(buf, str, sizeof(str)-1) == 0) { \
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tp = skip_whitespace(buf + sizeof(str)-1); \
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sp->name += fast_strtoul_10(&tp); \
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continue; \
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}
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SCAN("Shared_Clean:" , shared_clean );
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SCAN("Shared_Dirty:" , shared_dirty );
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SCAN("Private_Clean:", private_clean);
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SCAN("Private_Dirty:", private_dirty);
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#undef SCAN
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// f7d29000-f7d39000 rw-s ADR M:m OFS FILE
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tp = strchr(buf, '-');
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if (tp) {
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*tp = ' ';
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tp = buf;
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sz = fast_strtoul_16(&tp); /* start */
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sz = (fast_strtoul_16(&tp) - sz) >> 10; /* end - start */
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// tp -> "rw-s" string
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w = tp[1];
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// skipping "rw-s ADR M:m OFS "
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tp = skip_whitespace(skip_fields(tp, 4));
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// filter out /dev/something (something != zero)
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if (strncmp(tp, "/dev/", 5) != 0 || strcmp(tp, "/dev/zero\n") == 0) {
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if (w == 'w') {
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sp->mapped_rw += sz;
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} else if (w == '-') {
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sp->mapped_ro += sz;
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}
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}
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//else printf("DROPPING %s (%s)\n", buf, tp);
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if (strcmp(tp, "[stack]\n") == 0)
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sp->stack += sz;
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}
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}
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fclose(file);
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}
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}
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if (flags & PSSCAN_SMAPS)
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procps_read_smaps(pid, &sp->smaps, NULL, NULL);
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#endif /* TOPMEM */
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#if ENABLE_FEATURE_PS_ADDITIONAL_COLUMNS
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if (flags & PSSCAN_RUIDGID) {
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111
procps/pmap.c
Normal file
111
procps/pmap.c
Normal file
@ -0,0 +1,111 @@
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/*
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* pmap implementation for busybox
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*
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* Copyright (C) 2010 Nokia Corporation. All rights reserved.
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* Written by Alexander Shishkin <virtuoso@slind.org>
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*
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* Licensed under GPLv2 or later, see the LICENSE file in this source tree
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* for details.
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*/
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//applet:IF_PMAP(APPLET(pmap, _BB_DIR_USR_BIN, _BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_PMAP) += pmap.o
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//config:config PMAP
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//config: bool "pmap"
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//config: default y
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//config: help
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//config: Display processes' memory mappings.
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//usage:#define pmap_trivial_usage
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//usage: "[-x][-q] PID"
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//usage:#define pmap_full_usage "\n\n"
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//usage: "Display detailed precesses' memory usage\n"
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//usage: "\nOptions:"
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//usage: "\n -x show details"
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//usage: "\n -q quiet"
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#include "libbb.h"
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#if ULONG_MAX == 0xffffffff
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# define TABS "\t"
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# define AFMT "8"
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# define DASHES ""
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#else
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# define TABS "\t\t"
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# define AFMT "16"
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# define DASHES "--------"
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#endif
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enum {
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OPT_x = 1 << 0,
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OPT_q = 1 << 1,
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};
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static void print_smaprec(struct smaprec *currec, void *data)
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{
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unsigned opt = (unsigned)data;
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printf("%0" AFMT "lx ", currec->smap_start);
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if (opt & OPT_x)
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printf("%7lu %7lu %7lu %7lu ",
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currec->smap_size,
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currec->smap_pss,
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currec->private_dirty,
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currec->smap_swap);
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else
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printf("%7luK", currec->smap_size);
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printf(" %.4s %s\n", currec->smap_mode, currec->smap_name);
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}
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static int procps_get_maps(pid_t pid, unsigned opt)
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{
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struct smaprec total;
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int ret;
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char buf[256];
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read_cmdline(buf, sizeof(buf), pid, "no such process");
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printf("%u: %s\n", (int)pid, buf);
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if (!(opt & OPT_q) && (opt & OPT_x))
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puts("Address" TABS " Kbytes PSS Dirty Swap Mode Mapping");
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memset(&total, 0, sizeof(total));
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ret = procps_read_smaps(pid, &total, print_smaprec, (void*)opt);
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if (ret)
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return ret;
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if (!(opt & OPT_q)) {
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if (opt & OPT_x)
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printf("--------" DASHES " ------ ------ ------ ------\n"
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"total" TABS " %7lu %7lu %7lu %7lu\n",
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total.smap_size, total.smap_pss, total.private_dirty, total.smap_swap);
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else
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printf("mapped: %luK\n", total.smap_size);
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}
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return 0;
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}
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int pmap_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int pmap_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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int ret;
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opts = getopt32(argv, "xq");
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argv += optind;
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ret = 0;
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while (*argv) {
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pid_t pid = xatoi_positive(*argv++);
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/* GNU pmap returns 42 if any of the pids failed */
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if (procps_get_maps(pid, opts) != 0)
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ret = 42;
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}
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return ret;
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}
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16
procps/top.c
16
procps/top.c
@ -942,20 +942,20 @@ int top_main(int argc UNUSED_PARAM, char **argv)
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}
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#if ENABLE_FEATURE_TOPMEM
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else { /* TOPMEM */
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if (!(p->mapped_ro | p->mapped_rw))
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if (!(p->smaps.mapped_ro | p->smaps.mapped_rw))
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continue; /* kernel threads are ignored */
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n = ntop;
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/* No bug here - top and topmem are the same */
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top = xrealloc_vector(topmem, 6, ntop++);
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strcpy(topmem[n].comm, p->comm);
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topmem[n].pid = p->pid;
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topmem[n].vsz = p->mapped_rw + p->mapped_ro;
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topmem[n].vszrw = p->mapped_rw;
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topmem[n].rss_sh = p->shared_clean + p->shared_dirty;
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topmem[n].rss = p->private_clean + p->private_dirty + topmem[n].rss_sh;
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topmem[n].dirty = p->private_dirty + p->shared_dirty;
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topmem[n].dirty_sh = p->shared_dirty;
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topmem[n].stack = p->stack;
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topmem[n].vsz = p->smaps.mapped_rw + p->smaps.mapped_ro;
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topmem[n].vszrw = p->smaps.mapped_rw;
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topmem[n].rss_sh = p->smaps.shared_clean + p->smaps.shared_dirty;
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topmem[n].rss = p->smaps.private_clean + p->smaps.private_dirty + topmem[n].rss_sh;
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topmem[n].dirty = p->smaps.private_dirty + p->smaps.shared_dirty;
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topmem[n].dirty_sh = p->smaps.shared_dirty;
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topmem[n].stack = p->smaps.stack;
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}
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#endif
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} /* end of "while we read /proc" */
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