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nmeter: reinstate and document -d-1

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-03-15 17:54:17 +01:00
parent 41b1e2c392
commit 0d1b71e8e6
1 changed files with 15 additions and 17 deletions
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32
procps/nmeter.c
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@ -21,7 +21,7 @@
//usage:#define nmeter_full_usage "\n\n"
//usage: "Monitor system in real time"
//usage: "\n"
//usage: "\n -d MSEC Milliseconds between updates (default:1000)"
//usage: "\n -d MSEC Milliseconds between updates, default:1000, none:-1"
//usage: "\n"
//usage: "\nFormat specifiers:"
//usage: "\n %Nc or %[cN] CPU. N - bar size (default:10)"
@ -86,7 +86,7 @@ struct globals {
char final_char;
char *cur_outbuf;
int delta;
int deltanz;
unsigned deltanz;
struct timeval tv;
#define first_proc_file proc_stat
proc_file proc_stat; // Must match the order of proc_name's!
@ -101,8 +101,6 @@ struct globals {
#define is26 (G.is26 )
#define need_seconds (G.need_seconds )
#define cur_outbuf (G.cur_outbuf )
#define delta (G.delta )
#define deltanz (G.deltanz )
#define tv (G.tv )
#define proc_stat (G.proc_stat )
#define proc_loadavg (G.proc_loadavg )
@ -114,7 +112,7 @@ struct globals {
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
cur_outbuf = outbuf; \
G.final_char = '\n'; \
deltanz = delta = 1000000; \
G.deltanz = G.delta = 1000000; \
} while (0)
// We depend on this being a char[], not char* - we take sizeof() of it
@ -844,9 +842,9 @@ int nmeter_main(int argc UNUSED_PARAM, char **argv)
}
if (getopt32(argv, "d:", &opt_d)) {
delta = xatou(opt_d) * 1000;
deltanz = delta > 0 ? delta : 1;
need_seconds = (1000000 % deltanz) != 0;
G.delta = xatoi(opt_d) * 1000;
G.deltanz = G.delta > 0 ? G.delta : 1;
need_seconds = (1000000 % G.deltanz) != 0;
}
argv += optind;
@ -902,8 +900,8 @@ int nmeter_main(int argc UNUSED_PARAM, char **argv)
last->next = s;
last = s;
} else {
// %NNNNd or %r option. remove it from string
strcpy(prev + strlen(prev), cur);
// %r option. remove it from string
overlapping_strcpy(prev + strlen(prev), cur);
cur = prev;
}
}
@ -921,9 +919,9 @@ int nmeter_main(int argc UNUSED_PARAM, char **argv)
// Generate first samples but do not print them, they're bogus
collect_info(first);
reset_outbuf();
if (delta >= 0) {
if (G.delta >= 0) {
gettimeofday(&tv, NULL);
usleep(delta > 1000000 ? 1000000 : delta - tv.tv_usec%deltanz);
usleep(G.delta > 1000000 ? 1000000 : G.delta - tv.tv_usec % G.deltanz);
}
while (1) {
@ -937,18 +935,18 @@ int nmeter_main(int argc UNUSED_PARAM, char **argv)
// time resolution ;)
// TODO: detect and avoid useless updates
// (like: nothing happens except time)
if (delta >= 0) {
if (G.delta >= 0) {
int rem;
// can be commented out, will sacrifice sleep time precision a bit
gettimeofday(&tv, NULL);
if (need_seconds)
rem = delta - ((ullong)tv.tv_sec*1000000 + tv.tv_usec) % deltanz;
rem = G.delta - ((ullong)tv.tv_sec*1000000 + tv.tv_usec) % G.deltanz;
else
rem = delta - tv.tv_usec%deltanz;
rem = G.delta - (unsigned)tv.tv_usec % G.deltanz;
// Sometimes kernel wakes us up just a tiny bit earlier than asked
// Do not go to very short sleep in this case
if (rem < delta/128) {
rem += delta;
if (rem < (unsigned)G.delta / 128) {
rem += G.delta;
}
usleep(rem);
}