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fix start/stop bug in prof.

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also only time-limit if a value is provided.

R=rsc
DELTA=9  (4 added, 2 deleted, 3 changed)
OCL=18917
CL=18920
This commit is contained in:
Rob Pike 2008-11-10 14:53:32 -08:00
parent 091fb779a1
commit 10137e7f1d
1 changed files with 8 additions and 6 deletions
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14
src/cmd/prof/main.c
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@ -19,7 +19,7 @@ int fd;
Map *map;
Map *symmap;
struct Ureg ureg;
int total_sec = 10;
int total_sec = 0;
int delta_msec = 100;
int collapse = 1; // collapse histogram trace points in same function
@ -94,7 +94,6 @@ sample(void)
static int n;
n++;
ctlproc(pid, "stop");
for(i = 0; i < sizeof ureg; i+=8) {
if(get8(map, (uvlong)i, &((uvlong*)&ureg)[i/8]) < 0) {
if(n == 1)
@ -103,7 +102,6 @@ sample(void)
return 0;
}
}
ctlproc(pid, "start");
return 1;
}
@ -145,7 +143,7 @@ addtohistogram(uvlong pc, uvlong sp)
{
int h;
PC *x;
h = pc % Ncounters;
for(x = counters[h]; x != NULL; x = x->next) {
if(x->pc == pc) {
@ -188,10 +186,14 @@ samples(void)
req.tv_sec = delta_msec/1000;
req.tv_nsec = 1000000*(delta_msec % 1000);
for(msec = 0; msec < 1000*total_sec; msec += delta_msec) {
if(!sample())
for(msec = 0; total_sec <= 0 || msec < 1000*total_sec; msec += delta_msec) {
ctlproc(pid, "stop");
if(!sample()) {
ctlproc(pid, "start");
break;
}
printpc(ureg.ip, ureg.sp);
ctlproc(pid, "start");
nanosleep(&req, NULL);
}
}