top: add config option and code for global CPU % display
This commit is contained in:
Denis Vlasenko
parent
e8a0788b24
commit
5a65447e30
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@ -43,6 +43,16 @@ takes 55k of memory on 64-bit x86 kernel.
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On 32-bit kernel we need ~26k per applet.
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Script:
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i=1000; while test $i != 0; do
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echo -n .
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busybox sleep 30 &
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i=$((i - 1))
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done
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echo
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wait
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(Data from NOMMU arches are sought. Provide 'size busybox' output too)
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@ -79,8 +79,15 @@ const char* get_cached_groupname(gid_t gid)
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static int read_to_buf(const char *filename, void *buf)
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{
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ssize_t ret;
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ret = open_read_close(filename, buf, PROCPS_BUFSIZE-1);
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int fd;
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/* open_read_close() would do two reads, checking for EOF.
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* When you have 10000 /proc/$NUM/stat to read, it isn't desirable */
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ssize_t ret = -1;
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fd = open(filename, O_RDONLY);
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if (fd >= 0) {
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ret = read(fd, buf, PROCPS_BUFSIZE-1);
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close(fd);
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}
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((char *)buf)[ret > 0 ? ret : 0] = '\0';
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return ret;
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}
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@ -102,11 +102,18 @@ config TOP
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system.
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config FEATURE_TOP_CPU_USAGE_PERCENTAGE
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bool "Support showing CPU usage percentage (add 2k bytes)"
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bool "Show CPU per-process usage percentage (adds 2k bytes)"
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default y
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depends on TOP
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help
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Make top display CPU usage.
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Make top display CPU usage for each process.
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config FEATURE_TOP_CPU_GLOBAL_PERCENTS
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bool "Show CPU global usage percentage (adds 1k byte)"
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default y
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depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
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help
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Makes top display "CPU: n.n% us n.n% sy n.n% ni..." line.
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config UPTIME
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bool "uptime"
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58
procps/top.c
58
procps/top.c
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@ -221,7 +221,6 @@ static unsigned long display_generic(int scr_width)
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char scrbuf[80];
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char *end;
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unsigned long total, used, mfree, shared, buffers, cached;
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unsigned int needs_conversion = 1;
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/* read memory info */
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fp = xfopen("meminfo", "r");
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@ -240,14 +239,20 @@ static unsigned long display_generic(int scr_width)
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fgets(buf, sizeof(buf), fp); /* skip first line */
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fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
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&total, &used, &mfree, &shared, &buffers, &cached);
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&total, &used, &mfree, &shared, &buffers, &cached);
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/* convert to kilobytes */
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used /= 1024;
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mfree /= 1024;
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shared /= 1024;
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buffers /= 1024;
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cached /= 1024;
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total /= 1024;
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} else {
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/*
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* Revert to manual parsing, which incidentally already has the
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* sizes in kilobytes. This should be safe for both 2.4 and
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* 2.6.
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*/
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needs_conversion = 0;
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fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
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@ -273,16 +278,6 @@ static unsigned long display_generic(int scr_width)
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if (end) end = strchr(end+1, ' ');
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if (end) *end = '\0';
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if (needs_conversion) {
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/* convert to kilobytes */
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used /= 1024;
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mfree /= 1024;
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shared /= 1024;
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buffers /= 1024;
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cached /= 1024;
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total /= 1024;
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}
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/* output memory info and load average */
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/* clear screen & go to top */
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if (scr_width > sizeof(scrbuf))
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@ -293,8 +288,39 @@ static unsigned long display_generic(int scr_width)
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printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
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if (ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS) {
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/*
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* xxx% = (jif.xxx - prev_jif.xxx) / (jif.total - prev_jif.total) * 100%
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*/
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#define CALC_STAT(xxx) div_t xxx = div(1000 * (jif.xxx - prev_jif.xxx) / total_diff, 10)
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#define SHOW_STAT(xxx) xxx.quot, '0'+xxx.rem
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unsigned total_diff = (jif.total - prev_jif.total ? : 1);
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CALC_STAT(usr);
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CALC_STAT(sys);
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CALC_STAT(nic);
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CALC_STAT(idle);
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CALC_STAT(iowait);
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CALC_STAT(irq);
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CALC_STAT(softirq);
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//CALC_STAT(steal);
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snprintf(scrbuf, scr_width,
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/* %3u.%c in practice almost never displays "100.0"
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* and thus has implicit leading space: " 99.6" */
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"CPU:%3u.%c%% us%3u.%c%% sy%3u.%c%% ni%3u.%c%% id%3u.%c%% wa%3u.%c%% hi%3u.%c%% si",
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// %3u.%c%%st", - what is this 'steal' thing?
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// I doubt anyone needs to know it
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SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
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SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
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//, SHOW_STAT(steal)
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);
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puts(scrbuf);
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#undef SHOW_STAT
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#undef CALC_STAT
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}
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snprintf(scrbuf, scr_width, "Load average: %s", buf);
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printf("%s\n", scrbuf);
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puts(scrbuf);
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return total;
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}
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@ -479,7 +505,7 @@ int top_main(int argc, char **argv)
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procps_status_t *p = NULL;
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/* Default to 25 lines - 5 lines for status */
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lines = 24 - 3;
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lines = 24 - 3 USE_FEATURE_TOP_CPU_GLOBAL_PERCENTS( - 1);
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col = 79;
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#if ENABLE_FEATURE_USE_TERMIOS
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get_terminal_width_height(0, &col, &lines);
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@ -487,7 +513,7 @@ int top_main(int argc, char **argv)
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sleep(interval);
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continue;
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}
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lines -= 3;
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lines -= 3 USE_FEATURE_TOP_CPU_GLOBAL_PERCENTS( + 1);
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#endif /* FEATURE_USE_TERMIOS */
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/* read process IDs & status for all the processes */
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