summaryrefslogtreecommitdiff
path: root/procps/top.c
diff options
context:
space:
mode:
Diffstat (limited to 'procps/top.c')
-rw-r--r--procps/top.c100
1 files changed, 63 insertions, 37 deletions
diff --git a/procps/top.c b/procps/top.c
index 564e943..c6efe2d 100644
--- a/procps/top.c
+++ b/procps/top.c
@@ -293,14 +293,16 @@ static unsigned long display_generic(int scr_width)
* xxx% = (jif.xxx - prev_jif.xxx) / (jif.total - prev_jif.total) * 100%
*/
/* using (unsigned) cast to make multiplication cheaper: */
+#if ENABLE_FEATURE_TOP_DECIMALS
+/* Generated code is approx +0.5k */
+#define CALC_STAT(xxx) div_t xxx = div(1000 * (unsigned)(jif.xxx - prev_jif.xxx) / total_diff, 10)
+#define SHOW_STAT(xxx) xxx.quot, '0'+xxx.rem
+#define FMT "%3u.%c%%"
+#else
#define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(jif.xxx - prev_jif.xxx) / total_diff
#define SHOW_STAT(xxx) xxx
#define FMT "%3u%%"
-// We can display fractional percents, but at least in glibc div() is a _function_
-// and generated code is really awful and big (+0.5k more code):
-//#define CALC_STAT(xxx) div_t xxx = div(1000 * (unsigned)(jif.xxx - prev_jif.xxx) / total_diff, 10)
-//#define SHOW_STAT(xxx) xxx.quot, '0'+xxx.rem
-//#define FMT "%3u.%c%%"
+#endif
unsigned total_diff = (jif.total - prev_jif.total ? : 1);
CALC_STAT(usr);
CALC_STAT(sys);
@@ -312,14 +314,14 @@ static unsigned long display_generic(int scr_width)
//CALC_STAT(steal);
snprintf(scrbuf, scr_width,
- /* %3u in practice almost never displays "100"
+ /* Barely fits in 79 chars when in "decimals" mode.
+ * %3u in practice almost never displays "100"
* and thus has implicit leading space: " 99" */
- "CPU:"FMT" usr"FMT" sys"FMT" nice"FMT" idle"FMT" wait"FMT" irq"FMT" softirq",
- // FMT" steal", - what is this 'steal' thing?
- // I doubt anyone needs to know it
+ "CPU:"FMT" usr"FMT" sys"FMT" nice"FMT" idle"FMT" io"FMT" irq"FMT" softirq",
SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
- //, SHOW_STAT(steal)
+ //, SHOW_STAT(steal) - what is this 'steal' thing?
+ // I doubt anyone wants to know it
);
puts(scrbuf);
#undef SHOW_STAT
@@ -333,45 +335,59 @@ static unsigned long display_generic(int scr_width)
return total;
}
-
+#if ENABLE_FEATURE_TOP_DECIMALS
+#define UPSCALE 1000
+#define CALC_STAT(name, val) div_t name = div((val), 10)
+#define SHOW_STAT(name) name.quot, '0'+name.rem
+#define FMT "%3u.%c"
+#else
+#define UPSCALE 100
+#define CALC_STAT(name, val) unsigned name = (val)
+#define SHOW_STAT(name) name
+#define FMT " %3u%%"
+#endif
/* display process statuses */
static void display_status(int count, int scr_width)
{
enum {
- bits_per_int = sizeof(int)*8
+ BITS_PER_INT = sizeof(int)*8
};
top_status_t *s = top;
char vsz_str_buf[8];
unsigned long total_memory = display_generic(scr_width); /* or use total_vsz? */
- unsigned pmem_shift, pmem_scale;
-
+ /* xxx_shift and xxx_scale variables allow us to replace
+ * expensive divides with multiply and shift */
+ unsigned pmem_shift, pmem_scale, pmem_half;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
- unsigned pcpu_shift, pcpu_scale;
+ unsigned pcpu_shift, pcpu_scale, pcpu_half;
unsigned busy_jifs;
/* what info of the processes is shown */
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
- " PID USER STATUS VSZ PPID %CPU %MEM COMMAND");
+ " PID PPID USER STAT VSZ %MEM %CPU COMMAND");
#define MIN_WIDTH \
- sizeof( " PID USER STATUS VSZ PPID %CPU %MEM C")
+ sizeof( " PID PPID USER STAT VSZ %MEM %CPU C")
#else
+
+ /* !CPU_USAGE_PERCENTAGE */
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
- " PID USER STATUS VSZ PPID %MEM COMMAND");
+ " PID PPID USER STAT VSZ %MEM COMMAND");
#define MIN_WIDTH \
- sizeof( " PID USER STATUS VSZ PPID %MEM C")
+ sizeof( " PID PPID USER STAT VSZ %MEM C")
#endif
/*
* MEM% = s->vsz/MemTotal
*/
- pmem_shift = bits_per_int-11;
- pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
+ pmem_shift = BITS_PER_INT-11;
+ pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
/* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
while (pmem_scale >= 512) {
pmem_scale /= 4;
pmem_shift -= 2;
}
+ pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
busy_jifs = jif.busy - prev_jif.busy;
/* This happens if there were lots of short-lived processes
@@ -387,8 +403,8 @@ static void display_status(int count, int scr_width)
* we assume that unsigned is at least 32-bit.
*/
pcpu_shift = 6;
- pcpu_scale = (1000*64*(uint16_t)busy_jifs ? : 1);
- while (pcpu_scale < (1U<<(bits_per_int-2))) {
+ pcpu_scale = (UPSCALE*64*(uint16_t)busy_jifs ? : 1);
+ while (pcpu_scale < (1U<<(BITS_PER_INT-2))) {
pcpu_scale *= 4;
pcpu_shift += 2;
}
@@ -398,28 +414,35 @@ static void display_status(int count, int scr_width)
pcpu_scale /= 4;
pcpu_shift -= 2;
}
+ pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
#endif
+
+ /* Ok, all prelim data is ready, go thru the list */
while (count-- > 0) {
- div_t pmem = div((s->vsz*pmem_scale) >> pmem_shift, 10);
int col = scr_width+1;
- USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
+ CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
+#endif
if (s->vsz >= 100*1024)
sprintf(vsz_str_buf, "%6ldM", s->vsz/1024);
else
sprintf(vsz_str_buf, "%7ld", s->vsz);
- USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(
- pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);
- )
- col -= printf("\n%5u %-8s %s "
- "%s%6u"
- USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c")
- "%3u.%c ",
- s->pid, get_cached_username(s->uid), s->state,
- vsz_str_buf, s->ppid,
- USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
- pmem.quot, '0'+pmem.rem);
+ // PID PPID USER STAT VSZ %MEM [%CPU] COMMAND
+ col -= printf("\n" "%5u%6u %-8s %s%s" FMT
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ FMT
+#endif
+ " ",
+ s->pid, s->ppid, get_cached_username(s->uid),
+ s->state, vsz_str_buf,
+ SHOW_STAT(pmem)
+#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
+ , SHOW_STAT(pcpu)
+#endif
+ );
if (col > 0)
printf("%.*s", col, s->comm);
/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
@@ -430,6 +453,9 @@ static void display_status(int count, int scr_width)
putchar(OPT_BATCH_MODE ? '\n' : '\r');
fflush(stdout);
}
+#undef SHOW_STAT
+#undef CALC_STAT
+#undef FMT
static void clearmems(void)
@@ -549,7 +575,7 @@ int top_main(int argc, char **argv)
strcpy(top[n].comm, p->comm);
}
if (ntop == 0) {
- bb_error_msg_and_die("can't find process info in /proc");
+ bb_error_msg_and_die("no process info in /proc");
}
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
if (!prev_hist_count) {
generated by cgit v1.1 at 2024-11-02 14:35:00 +0000