top: provide more accurate cpu usage stats for startup
The top program already incorporated a modest delay at startup so that some minimal process cpu history could be established. However, Summary Area system level cpu statistic history reflected usage since boot. As such, unchanging % values would be shown with every restart. This commit just adopts the same approach used in task %CPU history for the Summary Area statistics. In other words, it introduces a 'priming read' at startup as is found in the newlib implementation for the <stat> API. Reference(s): https://gitlab.com/procps-ng/procps/merge_requests/42 Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is contained in:
Jim Warner
Craig Small
parent
909b37d755
commit
56d79b9d13
40
top/top.c
40
top/top.c
@ -92,6 +92,7 @@ static int Rc_questions;
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static unsigned Pg2K_shft = 0;
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/* SMP, Irix/Solaris mode, Linux 2.5.xx support */
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static CPU_t *Cpu_tics;
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static int Cpu_faux_tot;
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static float Cpu_pmax;
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static const char *Cpu_States_fmts;
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@ -2347,10 +2348,10 @@ static void zap_fieldstab (void) {
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* This guy's modeled on libproc's 'eight_cpu_numbers' function except
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* we preserve all cpu data in our CPU_t array which is organized
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* as follows:
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* cpus[0] thru cpus[n] == tics for each separate cpu
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* cpus[sumSLOT] == tics from the 1st /proc/stat line
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* Cpu_tics[0] thru Cpu_tics[n] == tics for each separate cpu
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* Cpu_tics[sumSLOT] == tics from /proc/stat line #1
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* [ and beyond sumSLOT == tics for each cpu NUMA node ] */
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static CPU_t *cpus_refresh (CPU_t *cpus) {
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static void cpus_refresh (void) {
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#define sumSLOT ( smp_num_cpus )
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#define totSLOT ( 1 + smp_num_cpus + Numa_node_tot)
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static FILE *fp = NULL;
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@ -2368,7 +2369,7 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
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sav_slot = sumSLOT;
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zap_fieldstab();
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if (fp) { fclose(fp); fp = NULL; }
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if (cpus) { free(cpus); cpus = NULL; }
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if (Cpu_tics) free(Cpu_tics);
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}
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/* by opening this file once, we'll avoid the hit on minor page faults
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@ -2378,7 +2379,7 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
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error_exit(fmtmk(N_fmt(FAIL_statopn_fmt), strerror(errno)));
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/* note: we allocate one more CPU_t via totSLOT than 'cpus' so that a
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slot can hold tics representing the /proc/stat cpu summary */
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cpus = alloc_c(totSLOT * sizeof(CPU_t));
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Cpu_tics = alloc_c(totSLOT * sizeof(CPU_t));
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}
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rewind(fp);
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fflush(fp);
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@ -2401,7 +2402,7 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
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#undef buffGRW
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// remember from last time around
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sum_ptr = &cpus[sumSLOT];
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sum_ptr = &Cpu_tics[sumSLOT];
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memcpy(&sum_ptr->sav, &sum_ptr->cur, sizeof(CT_t));
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// then value the last slot with the cpu summary line
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if (4 > sscanf(bp, "cpu %llu %llu %llu %llu %llu %llu %llu %llu"
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@ -2428,7 +2429,7 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
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// now value each separate cpu's tics...
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for (i = 0; i < sumSLOT; i++) {
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CPU_t *cpu_ptr = &cpus[i]; // avoid gcc subscript bloat
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CPU_t *cpu_ptr = &Cpu_tics[i]; // avoid gcc subscript bloat
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#ifdef PRETEND8CPUS
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bp = buf;
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#endif
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@ -2439,7 +2440,6 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
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, &cpu_ptr->cur.u, &cpu_ptr->cur.n, &cpu_ptr->cur.s
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, &cpu_ptr->cur.i, &cpu_ptr->cur.w, &cpu_ptr->cur.x
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, &cpu_ptr->cur.y, &cpu_ptr->cur.z)) {
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memmove(cpu_ptr, sum_ptr, sizeof(CPU_t));
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break; // tolerate cpus taken offline
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}
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@ -2479,8 +2479,6 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
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} // end: for each cpu
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Cpu_faux_tot = i; // tolerate cpus taken offline
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return cpus;
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#undef sumSLOT
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#undef totSLOT
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} // end: cpus_refresh
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@ -5156,7 +5154,6 @@ static void summary_hlp (CPU_t *cpu, const char *pfx) {
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static void summary_show (void) {
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#define isROOM(f,n) (CHKw(w, f) && Msg_row + (n) < Screen_rows - 1)
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#define anyFLG 0xffffff
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static CPU_t *smpcpu = NULL;
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WIN_t *w = Curwin; // avoid gcc bloat with a local copy
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char tmp[MEDBUFSIZ];
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int i;
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@ -5179,7 +5176,7 @@ static void summary_show (void) {
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, Frame_stopped, Frame_zombied));
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Msg_row += 1;
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smpcpu = cpus_refresh(smpcpu);
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cpus_refresh();
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#ifndef NUMA_DISABLE
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if (!Numa_node_tot) goto numa_nope;
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@ -5187,11 +5184,11 @@ static void summary_show (void) {
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if (CHKw(w, View_CPUNOD)) {
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if (Numa_node_sel < 0) {
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// display the 1st /proc/stat line, then the nodes (if room)
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summary_hlp(&smpcpu[smp_num_cpus], N_txt(WORD_allcpus_txt));
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summary_hlp(&Cpu_tics[smp_num_cpus], N_txt(WORD_allcpus_txt));
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Msg_row += 1;
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// display each cpu node's states
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for (i = 0; i < Numa_node_tot; i++) {
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CPU_t *nod_ptr = &smpcpu[1 + smp_num_cpus + i];
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CPU_t *nod_ptr = &Cpu_tics[1 + smp_num_cpus + i];
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if (!isROOM(anyFLG, 1)) break;
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#ifndef OFF_NUMASKIP
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if (nod_ptr->id) {
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@ -5206,13 +5203,13 @@ static void summary_show (void) {
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} else {
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// display the node summary, then the associated cpus (if room)
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snprintf(tmp, sizeof(tmp), N_fmt(NUMA_nodenam_fmt), Numa_node_sel);
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summary_hlp(&smpcpu[1 + smp_num_cpus + Numa_node_sel], tmp);
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summary_hlp(&Cpu_tics[1 + smp_num_cpus + Numa_node_sel], tmp);
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Msg_row += 1;
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for (i = 0; i < Cpu_faux_tot; i++) {
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if (Numa_node_sel == smpcpu[i].node) {
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if (Numa_node_sel == Cpu_tics[i].node) {
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if (!isROOM(anyFLG, 1)) break;
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snprintf(tmp, sizeof(tmp), N_fmt(WORD_eachcpu_fmt), smpcpu[i].id);
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summary_hlp(&smpcpu[i], tmp);
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snprintf(tmp, sizeof(tmp), N_fmt(WORD_eachcpu_fmt), Cpu_tics[i].id);
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summary_hlp(&Cpu_tics[i], tmp);
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Msg_row += 1;
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}
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}
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@ -5222,14 +5219,14 @@ numa_nope:
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#endif
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if (CHKw(w, View_CPUSUM)) {
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// display just the 1st /proc/stat line
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summary_hlp(&smpcpu[Cpu_faux_tot], N_txt(WORD_allcpus_txt));
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summary_hlp(&Cpu_tics[Cpu_faux_tot], N_txt(WORD_allcpus_txt));
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Msg_row += 1;
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} else {
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// display each cpu's states separately, screen height permitting...
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for (i = 0; i < Cpu_faux_tot; i++) {
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snprintf(tmp, sizeof(tmp), N_fmt(WORD_eachcpu_fmt), smpcpu[i].id);
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summary_hlp(&smpcpu[i], tmp);
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snprintf(tmp, sizeof(tmp), N_fmt(WORD_eachcpu_fmt), Cpu_tics[i].id);
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summary_hlp(&Cpu_tics[i], tmp);
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Msg_row += 1;
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if (!isROOM(anyFLG, 1)) break;
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}
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@ -5697,6 +5694,7 @@ static void frame_make (void) {
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// whoa either first time or thread/task mode change, (re)prime the pump...
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if (Pseudo_row == PROC_XTRA) {
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cpus_refresh();
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procs_refresh();
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usleep(LIB_USLEEP);
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putp(Cap_clr_scr);
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@ -730,7 +730,7 @@ typedef struct WIN_t {
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//atic inline void widths_resize (void);
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//atic void zap_fieldstab (void);
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/*------ Library Interface ---------------------------------------------*/
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//atic CPU_t *cpus_refresh (CPU_t *cpus);
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//atic void cpus_refresh (void);
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#ifdef OFF_HST_HASH
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//atic inline HST_t *hstbsrch (HST_t *hst, int max, int pid);
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#else
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