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locks: whack a failed experiment in form of restrict_starvation

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This was never enabled and only pollutes the code. The issue will
be addressed later in a different manner.

Sponsored by:	Rubicon Communications, LLC ("Netgate")
This commit is contained in:
Mateusz Guzik 2022-09-16 17:28:35 +00:00
parent cf13e67730
commit 50176b0296
1 changed files with 0 additions and 17 deletions
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17
sys/kern/subr_lock.c
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@ -64,9 +64,6 @@ __FBSDID("$FreeBSD$");
*/
//#define LOCK_PROFILING_DEBUG_SPIN
SDT_PROVIDER_DEFINE(lock);
SDT_PROBE_DEFINE1(lock, , , starvation, "u_int");
CTASSERT(LOCK_CLASS_MAX == 15);
struct lock_class *lock_classes[LOCK_CLASS_MAX + 1] = {
@ -120,14 +117,6 @@ static SYSCTL_NODE(_debug_lock, OID_AUTO, delay,
CTLFLAG_RD | CTLFLAG_MPSAFE, NULL,
"lock delay");
static u_int __read_mostly starvation_limit = 131072;
SYSCTL_INT(_debug_lock_delay, OID_AUTO, starvation_limit, CTLFLAG_RW,
&starvation_limit, 0, "");
static u_int __read_mostly restrict_starvation = 0;
SYSCTL_INT(_debug_lock_delay, OID_AUTO, restrict_starvation, CTLFLAG_RW,
&restrict_starvation, 0, "");
void
lock_delay(struct lock_delay_arg *la)
{
@ -141,12 +130,6 @@ lock_delay(struct lock_delay_arg *la)
la->delay <<= 1;
if (__predict_false(la->delay > lc->max))
la->delay = lc->max;
if (__predict_false(la->spin_cnt > starvation_limit)) {
SDT_PROBE1(lock, , , starvation, la->delay);
if (restrict_starvation)
la->delay = lc->base;
}
}
static u_int