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top: optional SMP support by Vineet Gupta (vineetg76 AT gmail.com)

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This commit is contained in:
Denis Vlasenko
2008-09-25 10:48:06 +00:00
parent e0bcba18eb
commit 17e7f04c8d
4 changed files with 316 additions and 101 deletions
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352
procps/top.c
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@@ -16,6 +16,12 @@
* (C) Eero Tamminen <oak at welho dot com>
*
* Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
*
* Sept 2008: Vineet Gupta <vineet.gupta@arc.com>
* Added Support for reporting SMP Information
* - CPU where Process was last seen running
* (to see effect of sched_setaffinity() etc)
* - CPU Time Split (idle/IO/wait etc) PER CPU
*/
/* Original code Copyrights */
@@ -41,6 +47,9 @@ typedef struct top_status_t {
unsigned uid;
char state[4];
char comm[COMM_LEN];
#if ENABLE_FEATURE_TOP_SMP_PROCESS
int last_seen_on_cpu;
#endif
} top_status_t;
typedef struct jiffy_counts_t {
@@ -69,6 +78,9 @@ struct globals {
smallint sort_field;
smallint inverted;
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
smallint smp_cpu_info; /* one/many cpu info lines? */
#endif
#if ENABLE_FEATURE_USE_TERMIOS
struct termios initial_settings;
#endif
@@ -82,6 +94,11 @@ struct globals {
/* int hist_iterations; */
unsigned total_pcpu;
/* unsigned long total_vsz; */
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
/* Per CPU samples: current and last */
jiffy_counts_t *cpu_jif, *cpu_prev_jif;
int num_cpus;
#endif
char line_buf[80];
};
@@ -98,12 +115,16 @@ enum { LINE_BUF_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line_buf) };
#define ntop (G.ntop )
#define sort_field (G.sort_field )
#define inverted (G.inverted )
#define smp_cpu_info (G.smp_cpu_info )
#define initial_settings (G.initial_settings )
#define sort_function (G.sort_function )
#define prev_hist (G.prev_hist )
#define prev_hist_count (G.prev_hist_count )
#define jif (G.jif )
#define prev_jif (G.prev_jif )
#define cpu_jif (G.cpu_jif )
#define cpu_prev_jif (G.cpu_prev_jif )
#define num_cpus (G.num_cpus )
#define total_pcpu (G.total_pcpu )
#define line_buf (G.line_buf )
@@ -161,23 +182,93 @@ static int mult_lvl_cmp(void* a, void* b)
return 0;
}
/* NOINLINE so that complier doesn't unfold the call
* causing multiple copies of the arithmatic instrns
*/
static NOINLINE int read_cpu_jiffy(FILE *fp, jiffy_counts_t *p_jif)
{
#if !ENABLE_FEATURE_TOP_SMP_CPU
static const char fmt[] = "cpu %lld %lld %lld %lld %lld %lld %lld %lld";
#else
static const char fmt[] = "cp%*s %lld %lld %lld %lld %lld %lld %lld %lld";
#endif
int ret;
if (!fgets(line_buf, LINE_BUF_SIZE, fp) || line_buf[0] != 'c' /* not "cpu" */)
return 0;
ret = sscanf(line_buf, fmt,
&p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
&p_jif->iowait, &p_jif->irq, &p_jif->softirq,
&p_jif->steal);
if (ret > 4) {
p_jif->total = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
+ p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
/* procps 2.x does not count iowait as busy time */
p_jif->busy = p_jif->total - p_jif->idle - p_jif->iowait;
}
return ret;
}
static void get_jiffy_counts(void)
{
FILE* fp = xfopen_for_read("stat");
prev_jif = jif;
if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
&jif.usr,&jif.nic,&jif.sys,&jif.idle,
&jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
bb_error_msg_and_die("can't read /proc/stat");
}
fclose(fp);
jif.total = jif.usr + jif.nic + jif.sys + jif.idle
+ jif.iowait + jif.irq + jif.softirq + jif.steal;
/* procps 2.x does not count iowait as busy time */
jif.busy = jif.total - jif.idle - jif.iowait;
}
#if !ENABLE_FEATURE_TOP_SMP_CPU
prev_jif = jif;
if (read_cpu_jiffy(fp, &jif) < 4)
bb_error_msg_and_die("can't read /proc/stat");
fclose(fp);
return;
#else
if (!smp_cpu_info) { /* user wants to see cumulative cpu info */
prev_jif = jif;
if (read_cpu_jiffy(fp, &jif) < 4)
bb_error_msg_and_die("can't read /proc/stat");
fclose(fp);
return;
}
/* Discard first "cpu ..." line */
fgets(line_buf, LINE_BUF_SIZE, fp);
if (!num_cpus) {
/* First time here. How many CPUs?
* There will be at least 1 /proc/stat line with cpu%d
*/
while (1) {
cpu_jif = xrealloc_vector(cpu_jif, 1, num_cpus);
if (read_cpu_jiffy(fp, &cpu_jif[num_cpus]) <= 4)
break;
num_cpus++;
}
if (num_cpus == 0) /* /proc/stat with only "cpu ..." line?! */
smp_cpu_info = 0;
/* TODO: need to cap num_cpus to a reasonable num
* on massively paralle machines so that we dont
* swamp the terminal with cpu "only" info
*/
cpu_prev_jif = xzalloc(sizeof(cpu_prev_jif[0]) * num_cpus);
/* Otherwise the first per cpu display shows all 100% idles */
usleep(50000);
} else { /* Non first time invocation */
jiffy_counts_t *tmp;
int i;
/* First switch the sample pointers: no need to copy */
tmp = cpu_prev_jif;
cpu_prev_jif = cpu_jif;
cpu_jif = tmp;
/* Get the new samples */
for (i = 0; i < num_cpus; i++)
read_cpu_jiffy(fp, &cpu_jif[i]);
}
#endif
fclose(fp);
}
static void do_stats(void)
{
@@ -189,7 +280,7 @@ static void do_stats(void)
get_jiffy_counts();
total_pcpu = 0;
/* total_vsz = 0; */
new_hist = xmalloc(sizeof(struct save_hist)*ntop);
new_hist = xmalloc(sizeof(new_hist[0]) * ntop);
/*
* Make a pass through the data to get stats.
*/
@@ -230,6 +321,7 @@ static void do_stats(void)
prev_hist = new_hist;
prev_hist_count = ntop;
}
#endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
@@ -257,15 +349,92 @@ static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
}
#endif
static unsigned long display_header(int scr_width)
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
{
/*
* xxx% = (jif.xxx - prev_jif.xxx) / (jif.total - prev_jif.total) * 100%
*/
unsigned total_diff;
jiffy_counts_t *p_jif, *p_prev_jif;
int i;
#if ENABLE_FEATURE_TOP_SMP_CPU
int n_cpu_lines;
#endif
/* using (unsigned) casts to make operations cheaper */
#define CALC_TOT_DIFF ((unsigned)(p_jif->total - p_prev_jif->total) ? : 1)
#if ENABLE_FEATURE_TOP_DECIMALS
#define CALC_STAT(xxx) char xxx[8]
#define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(p_jif->xxx - p_prev_jif->xxx), total_diff)
#define FMT "%s"
#else
#define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(p_jif->xxx - p_prev_jif->xxx) / total_diff
#define SHOW_STAT(xxx) xxx
#define FMT "%4u%% "
#endif
#if !ENABLE_FEATURE_TOP_SMP_CPU
{
i = 1;
p_jif = &jif;
p_prev_jif = &prev_jif;
#else
/* Loop thru CPU(s) */
n_cpu_lines = smp_cpu_info ? num_cpus : 1;
if (n_cpu_lines > *lines_rem_p)
n_cpu_lines = *lines_rem_p;
for (i = 0; i < n_cpu_lines; i++) {
/* set the real loop end */
p_jif = &cpu_jif[i];
p_prev_jif = &cpu_prev_jif[i];
#endif
total_diff = CALC_TOT_DIFF;
{ /* Need block: CALC_STAT are declarations */
CALC_STAT(usr);
CALC_STAT(sys);
CALC_STAT(nic);
CALC_STAT(idle);
CALC_STAT(iowait);
CALC_STAT(irq);
CALC_STAT(softirq);
/*CALC_STAT(steal);*/
snprintf(scrbuf, scr_width,
/* Barely fits in 79 chars when in "decimals" mode. */
#if ENABLE_FEATURE_TOP_SMP_CPU
"CPU%s:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
(smp_cpu_info ? utoa(i) : ""),
#else
"CPU:"FMT"usr"FMT"sys"FMT"nic"FMT"idle"FMT"io"FMT"irq"FMT"sirq",
#endif
SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
/*, SHOW_STAT(steal) - what is this 'steal' thing? */
/* I doubt anyone wants to know it */
);
puts(scrbuf);
}
}
#undef SHOW_STAT
#undef CALC_STAT
#undef FMT
*lines_rem_p -= i;
}
#else /* !ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS */
#define display_cpus(scr_width, scrbuf, lines_rem) ((void)0)
#endif
static unsigned long display_header(int scr_width, int *lines_rem_p)
{
FILE *fp;
char buf[80];
char scrbuf[80];
unsigned long total, used, mfree, shared, buffers, cached;
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
unsigned total_diff;
#endif
/* read memory info */
fp = xfopen_for_read("meminfo");
@@ -298,7 +467,6 @@ static unsigned long display_header(int scr_width)
* sizes in kilobytes. This should be safe for both 2.4 and
* 2.6.
*/
fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
/*
@@ -323,47 +491,12 @@ static unsigned long display_header(int scr_width)
used, mfree, shared, buffers, cached);
/* clear screen & go to top */
printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
(*lines_rem_p)--;
#if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
/*
* xxx% = (jif.xxx - prev_jif.xxx) / (jif.total - prev_jif.total) * 100%
/* Display CPU time split as percentage of total time
* This displays either a cumulative line or one line per CPU
*/
/* using (unsigned) casts to make operations cheaper */
total_diff = ((unsigned)(jif.total - prev_jif.total) ? : 1);
#if ENABLE_FEATURE_TOP_DECIMALS
/* Generated code is approx +0.3k */
#define CALC_STAT(xxx) char xxx[8]
#define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(jif.xxx - prev_jif.xxx), total_diff)
#define FMT "%s"
#else
#define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(jif.xxx - prev_jif.xxx) / total_diff
#define SHOW_STAT(xxx) xxx
#define FMT "%4u%% "
#endif
{ /* need block: CALC_STAT are declarations */
CALC_STAT(usr);
CALC_STAT(sys);
CALC_STAT(nic);
CALC_STAT(idle);
CALC_STAT(iowait);
CALC_STAT(irq);
CALC_STAT(softirq);
//CALC_STAT(steal);
snprintf(scrbuf, scr_width,
/* Barely fits in 79 chars when in "decimals" mode. */
"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) - what is this 'steal' thing?
// I doubt anyone wants to know it
);
}
puts(scrbuf);
#undef SHOW_STAT
#undef CALC_STAT
#undef FMT
#endif
display_cpus(scr_width, scrbuf, lines_rem_p);
/* read load average as a string */
buf[0] = '\0';
@@ -371,35 +504,39 @@ static unsigned long display_header(int scr_width)
buf[sizeof("N.NN N.NN N.NN")-1] = '\0';
snprintf(scrbuf, scr_width, "Load average: %s", buf);
puts(scrbuf);
(*lines_rem_p)--;
return total;
}
static NOINLINE void display_process_list(int count, int scr_width)
static NOINLINE void display_process_list(int lines_rem, int scr_width)
{
enum {
BITS_PER_INT = sizeof(int)*8
BITS_PER_INT = sizeof(int) * 8
};
top_status_t *s = top;
top_status_t *s;
char vsz_str_buf[8];
unsigned long total_memory = display_header(scr_width); /* or use total_vsz? */
unsigned long total_memory = display_header(scr_width, &lines_rem); /* or use total_vsz? */
/* 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, pcpu_half;
unsigned busy_jifs;
#endif
/* what info of the processes is shown */
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
" PID PPID USER STAT VSZ %MEM %CPU COMMAND");
#else
/* !CPU_USAGE_PERCENTAGE */
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
" PID PPID USER STAT VSZ %MEM COMMAND");
" PID PPID USER STAT VSZ %MEM"
#if ENABLE_FEATURE_TOP_SMP_PROCESS
" CPU"
#endif
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
" %CPU"
#endif
" COMMAND");
lines_rem--;
#if ENABLE_FEATURE_TOP_DECIMALS
#define UPSCALE 1000
@@ -453,9 +590,12 @@ static NOINLINE void display_process_list(int count, int scr_width)
/* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
#endif
scr_width += 2; /* account for leading '\n' and trailing NUL */
/* Ok, all preliminary data is ready, go through the list */
while (count-- > 0) {
scr_width += 2; /* account for leading '\n' and trailing NUL */
if (lines_rem > ntop)
lines_rem = ntop;
s = top;
while (--lines_rem >= 0) {
unsigned col;
CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
@@ -466,9 +606,12 @@ static NOINLINE void display_process_list(int count, int scr_width)
sprintf(vsz_str_buf, "%6ldm", s->vsz/1024);
else
sprintf(vsz_str_buf, "%7ld", s->vsz);
// PID PPID USER STAT VSZ %MEM [%CPU] COMMAND
/* PID PPID USER STAT VSZ %MEM [%CPU] COMMAND */
col = snprintf(line_buf, scr_width,
"\n" "%5u%6u %-8.8s %s%s" FMT
#if ENABLE_FEATURE_TOP_SMP_PROCESS
" %3d"
#endif
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
FMT
#endif
@@ -476,6 +619,9 @@ static NOINLINE void display_process_list(int count, int scr_width)
s->pid, s->ppid, get_cached_username(s->uid),
s->state, vsz_str_buf,
SHOW_STAT(pmem)
#if ENABLE_FEATURE_TOP_SMP_PROCESS
, s->last_seen_on_cpu
#endif
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
, SHOW_STAT(pcpu)
#endif
@@ -580,7 +726,7 @@ static char *grab_number(char *str, const char *match, unsigned sz)
}
/* display header info (meminfo / loadavg) */
static void display_topmem_header(int scr_width)
static void display_topmem_header(int scr_width, int *lines_rem_p)
{
char linebuf[128];
unsigned i;
@@ -655,6 +801,8 @@ static void display_topmem_header(int scr_width)
"Swap %stotal %sfree", // TODO: % used?
S(swaptotal), S(swapfree));
printf("%.*s\n", scr_width, linebuf);
(*lines_rem_p) -= 3;
#undef S
for (i = 0; i < ARRAY_SIZE(str); i++)
@@ -680,19 +828,22 @@ static void ulltoa6_and_space(unsigned long long ul, char buf[6])
buf[5] = ' ';
}
static NOINLINE void display_topmem_process_list(int count, int scr_width)
static NOINLINE void display_topmem_process_list(int lines_rem, int scr_width)
{
#define HDR_STR " PID VSZ VSZRW RSS (SHR) DIRTY (SHR) STACK"
#define MIN_WIDTH sizeof(HDR_STR)
const topmem_status_t *s = topmem;
display_topmem_header(scr_width);
display_topmem_header(scr_width, &lines_rem);
strcpy(line_buf, HDR_STR " COMMAND");
line_buf[5 + sort_field * 6] = '*';
printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width, line_buf);
lines_rem--;
while (--count >= 0) {
// PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND
if (lines_rem > ntop)
lines_rem = ntop;
while (--lines_rem >= 0) {
/* PID VSZ VSZRW RSS (SHR) DIRTY (SHR) COMMAND */
ulltoa6_and_space(s->pid , &line_buf[0*6]);
ulltoa6_and_space(s->vsz , &line_buf[1*6]);
ulltoa6_and_space(s->vszrw , &line_buf[2*6]);
@@ -714,7 +865,7 @@ static NOINLINE void display_topmem_process_list(int count, int scr_width)
#undef MIN_WIDTH
}
#else
void display_topmem_process_list(int count, int scr_width);
void display_topmem_process_list(int lines_rem, int scr_width);
int topmem_sort(char *a, char *b);
#endif /* TOPMEM */
@@ -731,6 +882,9 @@ enum {
| PSSCAN_UTIME
| PSSCAN_STATE
| PSSCAN_COMM
#if ENABLE_FEATURE_TOP_SMP_PROCESS
| PSSCAN_CPU
#endif
| PSSCAN_UIDGID,
TOPMEM_MASK = 0
| PSSCAN_PID
@@ -741,9 +895,9 @@ enum {
int top_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int top_main(int argc UNUSED_PARAM, char **argv)
{
int count;
int iterations;
unsigned lines, col;
int lines_rem;
unsigned interval;
char *sinterval;
SKIP_FEATURE_TOPMEM(const) unsigned scan_mask = TOP_MASK;
@@ -760,12 +914,18 @@ int top_main(int argc UNUSED_PARAM, char **argv)
interval = 5; /* default update interval is 5 seconds */
iterations = 0; /* infinite */
#if ENABLE_FEATURE_TOP_SMP_CPU
/*num_cpus = 0;*/
/*smp_cpu_info = 0;*/ /* to start with show aggregate */
cpu_jif = &jif;
cpu_prev_jif = &prev_jif;
#endif
/* all args are options; -n NUM */
opt_complementary = "-:n+";
if (getopt32(argv, "d:n:b", &sinterval, &iterations) & OPT_d) {
/* Need to limit it to not overflow poll timeout */
interval = xatou16(sinterval); // -d
interval = xatou16(sinterval); /* -d */
}
/* change to /proc */
@@ -803,10 +963,6 @@ int top_main(int argc UNUSED_PARAM, char **argv)
#endif /* FEATURE_USE_TERMIOS */
if (col > LINE_BUF_SIZE-2) /* +2 bytes for '\n', NUL, */
col = LINE_BUF_SIZE-2;
if (!ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && scan_mask == TOP_MASK)
lines -= 3;
else
lines -= 4;
/* read process IDs & status for all the processes */
while ((p = procps_scan(p, scan_mask)) != NULL) {
@@ -823,6 +979,9 @@ int top_main(int argc UNUSED_PARAM, char **argv)
top[n].uid = p->uid;
strcpy(top[n].state, p->state);
strcpy(top[n].comm, p->comm);
#if ENABLE_FEATURE_TOP_SMP_PROCESS
top[n].last_seen_on_cpu = p->last_seen_on_cpu;
#endif
} else { /* TOPMEM */
#if ENABLE_FEATURE_TOPMEM
if (!(p->mapped_ro | p->mapped_rw))
@@ -856,7 +1015,7 @@ int top_main(int argc UNUSED_PARAM, char **argv)
continue;
}
do_stats();
/* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
/* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
#else
qsort(top, ntop, sizeof(top_status_t), (void*)(sort_function[0]));
@@ -867,15 +1026,15 @@ int top_main(int argc UNUSED_PARAM, char **argv)
qsort(topmem, ntop, sizeof(topmem_status_t), (void*)topmem_sort);
}
#endif
count = lines;
if (OPT_BATCH_MODE || count > ntop) {
count = ntop;
lines_rem = lines;
if (OPT_BATCH_MODE) {
lines_rem = INT_MAX;
}
if (scan_mask == TOP_MASK)
display_process_list(count, col);
display_process_list(lines_rem, col);
#if ENABLE_FEATURE_TOPMEM
else
display_topmem_process_list(count, col);
display_topmem_process_list(lines_rem, col);
#endif
clearmems();
if (iterations >= 0 && !--iterations)
@@ -932,6 +1091,23 @@ int top_main(int argc UNUSED_PARAM, char **argv)
if (c == 'r')
inverted ^= 1;
#endif
#if ENABLE_FEATURE_TOP_SMP_CPU
if (c == 'c') { /* procps-2.0.18 uses 'C' */
/* User wants to toggle per cpu <> aggregate */
if (smp_cpu_info) {
free(cpu_prev_jif);
free(cpu_jif);
cpu_jif = &jif;
cpu_prev_jif = &prev_jif;
} else {
/* Prepare for xrealloc() */
cpu_jif = cpu_prev_jif = NULL;
}
num_cpus = 0;
smp_cpu_info = !smp_cpu_info;
get_jiffy_counts();
}
#endif
#endif
}
#endif /* FEATURE_USE_TERMIOS */