int oprofile_setup(void)
{
int err;
mutex_lock(&start_mutex);
if ((err = alloc_cpu_buffers()))
goto out;
if ((err = alloc_event_buffer()))
goto out1;
if (oprofile_ops.setup && (err = oprofile_ops.setup()))
goto out2;
/* Note even though this starts part of the
* profiling overhead, it's necessary to prevent
* us missing task deaths and eventually oopsing
* when trying to process the event buffer.
*/
if (oprofile_ops.sync_start) {
int sync_ret = oprofile_ops.sync_start();
switch (sync_ret) {
case 0:
goto post_sync;
case 1:
goto do_generic;
case -1:
goto out3;
default:
goto out3;
}
}
do_generic:
if ((err = sync_start()))
goto out3;
post_sync:
is_setup = 1;
mutex_unlock(&start_mutex);
return 0;
out3:
if (oprofile_ops.shutdown)
oprofile_ops.shutdown();
out2:
free_event_buffer();
out1:
free_cpu_buffers();
out:
mutex_unlock(&start_mutex);
return err;
}
static Chan*
kprofattach(char *spec)
{
uint32_t n;
/* allocate when first used */
kprof.minpc = KTZERO;
kprof.maxpc = PTR2UINT(etext);
kprof.nbuf = (kprof.maxpc-kprof.minpc) >> LRES;
n = kprof.nbuf*SZ;
if(kprof.buf == 0) {
kprof.buf = malloc(n);
if(kprof.buf == 0)
error(Enomem);
}
kproftab[1].length = n;
alloc_cpu_buffers();
print("Kprof attached. Buf is %p, %d bytes, minpc %p maxpc %p\n",
kprof.buf, n, (void *)kprof.minpc, (void *)kprof.maxpc);
return devattach('K', spec);
}
int oprofile_setup(void)
{
int err;
down(&start_sem);
if ((err = alloc_cpu_buffers()))
goto out;
if ((err = alloc_event_buffer()))
goto out1;
if (oprofile_ops.setup && (err = oprofile_ops.setup()))
goto out2;
/* Note even though this starts part of the
* profiling overhead, it's necessary to prevent
* us missing task deaths and eventually oopsing
* when trying to process the event buffer.
*/
if ((err = sync_start()))
goto out3;
is_setup = 1;
up(&start_sem);
return 0;
out3:
if (oprofile_ops.shutdown)
oprofile_ops.shutdown();
out2:
free_event_buffer();
out1:
free_cpu_buffers();
out:
up(&start_sem);
return err;
}
