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| author |   mpi <mpi@openbsd.org> | 2019-05-25 18:11:10 +0000 |
|---|---|---|
| committer | mpi <mpi@openbsd.org> | 2019-05-25 18:11:10 +0000 |
| commit | ffa74332a4c46f7f634bd839d9ae8924c82bdeb5 (patch) | |
| tree | 55c212a56cd9f7b1bf152328fdc7f2bc8dee7e81 | |
| parent | Add <, >, <=, >= for formats, GitHub issue 1747. (diff) | |
| download | wireguard-openbsd-ffa74332a4c46f7f634bd839d9ae8924c82bdeb5.tar.xz wireguard-openbsd-ffa74332a4c46f7f634bd839d9ae8924c82bdeb5.zip | |
Do not account spinning time as running time when a thread crosses a
tick boundary of schedlock().
This reduces the contention on the SCHED_LOCK() when the current thread
is already spinning.
Prompted by deraadt@, ok visa@
| -rw-r--r-- | sys/kern/sched_bsd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/kern/sched_bsd.c b/sys/kern/sched_bsd.c index 00a08861b59..95c3bc23ef0 100644 --- a/sys/kern/sched_bsd.c +++ b/sys/kern/sched_bsd.c @@ -1,4 +1,4 @@ -/* $OpenBSD: sched_bsd.c,v 1.50 2019/02/26 14:24:21 visa Exp $ */ +/* $OpenBSD: sched_bsd.c,v 1.51 2019/05/25 18:11:10 mpi Exp $ */ /* $NetBSD: kern_synch.c,v 1.37 1996/04/22 01:38:37 christos Exp $ */ /*- @@ -542,7 +542,7 @@ schedclock(struct proc *p) struct schedstate_percpu *spc = &ci->ci_schedstate; int s; - if (p == spc->spc_idleproc) + if (p == spc->spc_idleproc || spc->spc_spinning) return; SCHED_LOCK(s); |