D39584.id120414.diff
No OneTemporary
Actions

Size

1 KB

Referenced Files

None

Subscribers

None

D39584.id120414.diff
View Options

	diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c
	--- a/sys/kern/kern_umtx.c
	+++ b/sys/kern/kern_umtx.c
	@@ -151,6 +151,26 @@
	&umtx_max_rb, 0,
	"Maximum number of robust mutexes allowed for each thread");

	+static sbintime_t umtx_min_timeout;
	+static int
	+sysctl_umtx_min_timeout(SYSCTL_HANDLER_ARGS)
	+{
	+ int error, val;
	+
	+ val = sbttons(umtx_min_timeout);
	+ error = sysctl_handle_int(oidp, &val, 0, req);
	+ if (error != 0 \|\| req->newptr == NULL)
	+ return (error);
	+ if (val < 0)
	+ return (EINVAL);
	+ umtx_min_timeout = nstosbt(val);
	+ return (0);
	+}
	+SYSCTL_PROC(_kern_ipc, OID_AUTO, umtx_min_timeout,
	+ CTLFLAG_RW \| CTLTYPE_UINT \| CTLFLAG_MPSAFE, NULL, 0,
	+ sysctl_umtx_min_timeout, "U",
	+ "Minimal timeout for umtx in nanoseconds");
	+
	static uma_zone_t umtx_pi_zone;
	static struct umtxq_chain umtxq_chains[2][UMTX_CHAINS];
	static MALLOC_DEFINE(M_UMTX, "umtx", "UMTX queue memory");
	@@ -759,6 +779,15 @@
	*sbt += SBT_1S - rem;
	break;
	}
	+ if (umtx_min_timeout != 0) {
	+ struct bintime now;
	+ sbintime_t when;
	+
	+ getbinuptime(&now);
	+ when = bttosbt(now) + umtx_min_timeout;
	+ if (*sbt < when)
	+ *sbt = when;
	+ }
	*flags = C_ABSOLUTE;
	return (0);