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top: on user suggestion make percentile calculations configurable. -56 bytes when off. +600 bytes when on
top: reorder columns, so that [P]PIDs are together and VSZ/%MEM are together. Makes more sense
This commit is contained in:
Denis Vlasenko
parent
d71e45856e
commit
745119605e
@ -109,12 +109,19 @@ config FEATURE_TOP_CPU_USAGE_PERCENTAGE
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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 0.5k byte)"
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bool "Show CPU global usage percentage (adds 0.5k bytes)"
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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: NN% usr NN% sys..." line.
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config FEATURE_TOP_DECIMALS
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bool "Show 1/10th of a percent in CPU/mem statistics (adds 0.5k bytes)"
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default n
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depends on FEATURE_TOP_CPU_USAGE_PERCENTAGE
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help
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Show 1/10th of a percent in CPU/mem statistics.
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config UPTIME
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bool "uptime"
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default n
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100
procps/top.c
100
procps/top.c
@ -293,14 +293,16 @@ static unsigned long display_generic(int scr_width)
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* xxx% = (jif.xxx - prev_jif.xxx) / (jif.total - prev_jif.total) * 100%
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*/
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/* using (unsigned) cast to make multiplication cheaper: */
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#if ENABLE_FEATURE_TOP_DECIMALS
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/* Generated code is approx +0.5k */
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#define CALC_STAT(xxx) div_t xxx = div(1000 * (unsigned)(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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#define FMT "%3u.%c%%"
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#else
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#define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(jif.xxx - prev_jif.xxx) / total_diff
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#define SHOW_STAT(xxx) xxx
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#define FMT "%3u%%"
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// We can display fractional percents, but at least in glibc div() is a _function_
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// and generated code is really awful and big (+0.5k more code):
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//#define CALC_STAT(xxx) div_t xxx = div(1000 * (unsigned)(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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//#define FMT "%3u.%c%%"
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#endif
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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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@ -312,14 +314,14 @@ static unsigned long display_generic(int scr_width)
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//CALC_STAT(steal);
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snprintf(scrbuf, scr_width,
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/* %3u in practice almost never displays "100"
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/* Barely fits in 79 chars when in "decimals" mode.
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* %3u in practice almost never displays "100"
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* and thus has implicit leading space: " 99" */
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"CPU:"FMT" usr"FMT" sys"FMT" nice"FMT" idle"FMT" wait"FMT" irq"FMT" softirq",
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// FMT" steal", - what is this 'steal' thing?
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// I doubt anyone needs to know it
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"CPU:"FMT" usr"FMT" sys"FMT" nice"FMT" idle"FMT" io"FMT" irq"FMT" softirq",
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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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//, SHOW_STAT(steal) - what is this 'steal' thing?
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// I doubt anyone wants to know it
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);
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puts(scrbuf);
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#undef SHOW_STAT
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@ -333,45 +335,59 @@ static unsigned long display_generic(int scr_width)
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return total;
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}
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#if ENABLE_FEATURE_TOP_DECIMALS
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#define UPSCALE 1000
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#define CALC_STAT(name, val) div_t name = div((val), 10)
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#define SHOW_STAT(name) name.quot, '0'+name.rem
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#define FMT "%3u.%c"
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#else
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#define UPSCALE 100
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#define CALC_STAT(name, val) unsigned name = (val)
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#define SHOW_STAT(name) name
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#define FMT " %3u%%"
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#endif
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/* display process statuses */
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static void display_status(int count, int scr_width)
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{
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enum {
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bits_per_int = sizeof(int)*8
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BITS_PER_INT = sizeof(int)*8
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};
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top_status_t *s = top;
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char vsz_str_buf[8];
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unsigned long total_memory = display_generic(scr_width); /* or use total_vsz? */
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unsigned pmem_shift, pmem_scale;
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/* xxx_shift and xxx_scale variables allow us to replace
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* expensive divides with multiply and shift */
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unsigned pmem_shift, pmem_scale, pmem_half;
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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unsigned pcpu_shift, pcpu_scale;
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unsigned pcpu_shift, pcpu_scale, pcpu_half;
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unsigned busy_jifs;
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/* what info of the processes is shown */
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printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
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" PID USER STATUS VSZ PPID %CPU %MEM COMMAND");
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" PID PPID USER STAT VSZ %MEM %CPU COMMAND");
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#define MIN_WIDTH \
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sizeof( " PID USER STATUS VSZ PPID %CPU %MEM C")
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sizeof( " PID PPID USER STAT VSZ %MEM %CPU C")
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#else
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/* !CPU_USAGE_PERCENTAGE */
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printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
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" PID USER STATUS VSZ PPID %MEM COMMAND");
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" PID PPID USER STAT VSZ %MEM COMMAND");
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#define MIN_WIDTH \
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sizeof( " PID USER STATUS VSZ PPID %MEM C")
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sizeof( " PID PPID USER STAT VSZ %MEM C")
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#endif
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/*
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* MEM% = s->vsz/MemTotal
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*/
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pmem_shift = bits_per_int-11;
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pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
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pmem_shift = BITS_PER_INT-11;
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pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
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/* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
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while (pmem_scale >= 512) {
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pmem_scale /= 4;
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pmem_shift -= 2;
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}
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pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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busy_jifs = jif.busy - prev_jif.busy;
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/* This happens if there were lots of short-lived processes
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@ -387,8 +403,8 @@ static void display_status(int count, int scr_width)
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* we assume that unsigned is at least 32-bit.
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*/
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pcpu_shift = 6;
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pcpu_scale = (1000*64*(uint16_t)busy_jifs ? : 1);
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while (pcpu_scale < (1U<<(bits_per_int-2))) {
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pcpu_scale = (UPSCALE*64*(uint16_t)busy_jifs ? : 1);
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while (pcpu_scale < (1U<<(BITS_PER_INT-2))) {
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pcpu_scale *= 4;
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pcpu_shift += 2;
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}
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@ -398,28 +414,35 @@ static void display_status(int count, int scr_width)
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pcpu_scale /= 4;
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pcpu_shift -= 2;
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}
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pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
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/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
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#endif
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/* Ok, all prelim data is ready, go thru the list */
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while (count-- > 0) {
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div_t pmem = div((s->vsz*pmem_scale) >> pmem_shift, 10);
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int col = scr_width+1;
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
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CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
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#endif
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if (s->vsz >= 100*1024)
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sprintf(vsz_str_buf, "%6ldM", s->vsz/1024);
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else
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sprintf(vsz_str_buf, "%7ld", s->vsz);
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(
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pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);
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)
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col -= printf("\n%5u %-8s %s "
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"%s%6u"
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c")
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"%3u.%c ",
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s->pid, get_cached_username(s->uid), s->state,
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vsz_str_buf, s->ppid,
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USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
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pmem.quot, '0'+pmem.rem);
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// PID PPID USER STAT VSZ %MEM [%CPU] COMMAND
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col -= printf("\n" "%5u%6u %-8s %s%s" FMT
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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FMT
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#endif
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" ",
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s->pid, s->ppid, get_cached_username(s->uid),
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s->state, vsz_str_buf,
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SHOW_STAT(pmem)
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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, SHOW_STAT(pcpu)
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#endif
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);
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if (col > 0)
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printf("%.*s", col, s->comm);
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/* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
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@ -430,6 +453,9 @@ static void display_status(int count, int scr_width)
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putchar(OPT_BATCH_MODE ? '\n' : '\r');
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fflush(stdout);
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}
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#undef SHOW_STAT
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#undef CALC_STAT
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#undef FMT
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static void clearmems(void)
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@ -549,7 +575,7 @@ int top_main(int argc, char **argv)
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strcpy(top[n].comm, p->comm);
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}
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if (ntop == 0) {
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bb_error_msg_and_die("can't find process info in /proc");
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bb_error_msg_and_die("no process info in /proc");
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}
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#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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if (!prev_hist_count) {
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