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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <bio.h>
- #include <mach.h>
- #define PCRES 8
- struct COUNTER
- {
- char *name; /* function name */
- int32_t time; /* ticks spent there */
- };
- void
- error(int perr, char *s)
- {
- fprint(2, "kprof: %s", s);
- if(perr){
- fprint(2, ": ");
- perror(0);
- }else
- fprint(2, "\n");
- exits(s);
- }
- int
- compar(const void *va, const void *vb)
- {
- struct COUNTER *a, *b;
- a = va;
- b = vb;
- if(a->time < b->time)
- return -1;
- if(a->time == b->time)
- return 0;
- return 1;
- }
- void
- main(int argc, char *argv[])
- {
- int fd;
- int32_t i, j, k, n;
- char *name;
- uint32_t *data;
- int64_t tbase;
- uint32_t sum;
- int32_t delta;
- Symbol s;
- Biobuf outbuf;
- Fhdr f;
- Dir *d;
- 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]);
- d = dirfstat(fd);
- if(d == 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);
- for(i=0; i<n; i++)
- data[i] = beswal(data[i]);
- delta = data[0]-data[1];
- print("total: %ld in kernel text: %ld outside kernel text: %ld\n",
- data[0], delta, data[1]);
- if(data[0] == 0)
- exits(0);
- if (!textsym(&s, 0))
- error(0, "no text symbols");
- tbase = mach->kbase;
- if(tbase != s.value & ~0xFFF)
- print("warning: kbase %.8llux != tbase %.8llux\n",
- tbase, s.value&~0xFFF);
- print("KTZERO %.8llux PGSIZE %dKb\n", tbase, mach->pgsize/1024);
- /*
- * Accumulate counts for each function
- */
- cp = 0;
- k = 0;
- for (i = 0, j = 2; j < n; i++) {
- name = s.name; /* save name */
- if (!textsym(&s, i)) /* get next symbol */
- break;
- s.value -= tbase;
- s.value /= PCRES;
- sum = 0;
- while (j < n && j < s.value)
- 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, "%ld\t%3lld.%lld\t%s\n",
- cp[k].time,
- 100LL*cp[k].time/delta,
- (1000LL*cp[k].time/delta)%10,
- cp[k].name);
- exits(0);
- }
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