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#include <lib9.h>
#include <bio.h>
#include <mach.h>
enum {
SpecialTotalTicks,
SpecialOutsideTicks,
SpecialMicroSecondsPerTick,
SpecialSamples,
SpecialSampleSize,
SpecialSampleLogBucketSize,
SpecialMax
};
int pcres = 8;
ulong uspertick;
struct COUNTER
{
char *name; /* function name */
ulong time; /* ticks spent there */
};
void
error(int perr, char *s)
{
fprint(2, "kprof: %s", s);
if(perr)
fprint(2, ": %r\n");
else
fprint(2, "\n");
exits(s);
}
int
compar(void *va, void *vb)
{
struct COUNTER *a, *b;
a = (struct COUNTER *)va;
b = (struct COUNTER *)vb;
if(a->time < b->time)
return -1;
if(a->time == b->time)
return 0;
return 1;
}
ulong
tickstoms(ulong ticks)
{
return ((vlong)ticks * uspertick) / 1000;
}
void
main(int argc, char *argv[])
{
int fd;
long i, j, k, n;
Dir *d;
char *name;
ulong *data;
ulong tbase, sum;
long delta;
Symbol s;
Biobuf outbuf;
Fhdr f;
struct COUNTER *cp;
if(argc != 3)
error(0, "usage: kprof text data");
/*
* Read symbol table
*/
fd = open(argv[1], OREAD);
if(fd < 0)
error(1, argv[1]);
if (!crackhdr(fd, &f))
error(1, "read text header");
if (f.type == FNONE)
error(0, "text file not an a.out");
if (syminit(fd, &f) < 0)
error(1, "syminit");
close(fd);
/*
* Read timing data
*/
fd = open(argv[2], OREAD);
if(fd < 0)
error(1, argv[2]);
if((d = dirfstat(fd)) == nil)
error(1, "stat");
n = d->length/sizeof(data[0]);
if(n < 2)
error(0, "data file too short");
data = malloc(d->length);
if(data == 0)
error(1, "malloc");
if(read(fd, data, d->length) < 0)
error(1, "text read");
close(fd);
free(d);
for(i=0; i<n; i++)
data[i] = beswal(data[i]);
pcres = 1 << data[SpecialSampleLogBucketSize];
uspertick = data[SpecialMicroSecondsPerTick];
if (data[SpecialSampleSize] != sizeof(data[0]))
error(0, "only sample size 4 supported\n");
delta = data[SpecialTotalTicks] - data[SpecialOutsideTicks];
print("total: %lud in kernel text: %lud outside kernel text: %lud\n",
data[0], delta, data[1]);
if(data[0] == 0)
exits(0);
if (!textsym(&s, 0))
error(0, "no text symbols");
tbase = s.value & ~(mach->pgsize-1); /* align down to page */
print("KTZERO %.8lux\n", tbase);
/*
* Accumulate counts for each function
*/
cp = 0;
k = 0;
for (i = 0, j = (s.value-tbase)/pcres+SpecialMax; j < n; i++) {
name = s.name; /* save name */
if (!textsym(&s, i)) /* get next symbol */
break;
sum = 0;
while (j < n && j*pcres < s.value-tbase)
sum += data[j++];
if (sum) {
cp = realloc(cp, (k+1)*sizeof(struct COUNTER));
if (cp == 0)
error(1, "realloc");
cp[k].name = name;
cp[k].time = sum;
k++;
}
}
if (!k)
error(0, "no counts");
cp[k].time = 0; /* "etext" can take no time */
/*
* Sort by time and print
*/
qsort(cp, k, sizeof(struct COUNTER), compar);
Binit(&outbuf, 1, OWRITE);
Bprint(&outbuf, "ms %% sym\n");
while(--k>=0)
Bprint(&outbuf, "%lud\t%3lud.%ld\t%s\n",
tickstoms(cp[k].time),
100*cp[k].time/delta,
(1000*cp[k].time/delta)%10,
cp[k].name);
exits(0);
}
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