diff options
| author |   tedu <tedu@openbsd.org> | 2014-12-15 20:38:22 +0000 |
|---|---|---|
| committer | tedu <tedu@openbsd.org> | 2014-12-15 20:38:22 +0000 |
| commit | 16af66b18a2ea3e42f9256168052a7cd8b906c89 (patch) | |
| tree | 53c68b44738c1979a787cd220e537f9ea95002f1 | |
| parent | .Xr cut which may be what you're really looking for. (diff) | |
| download | wireguard-openbsd-16af66b18a2ea3e42f9256168052a7cd8b906c89.tar.xz wireguard-openbsd-16af66b18a2ea3e42f9256168052a7cd8b906c89.zip | |
don't drop the kernel lock everytime. on a busy system, this results in
the reaper spending more than half its time in uvm_pause. we want the
system to be interactive, but we want throughput too. this seems like a
decent balance.
| -rw-r--r-- | sys/uvm/uvm_glue.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/sys/uvm/uvm_glue.c b/sys/uvm/uvm_glue.c index 7a9618aa496..9eff05e49e9 100644 --- a/sys/uvm/uvm_glue.c +++ b/sys/uvm/uvm_glue.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_glue.c,v 1.68 2014/12/05 04:12:48 uebayasi Exp $ */ +/* $OpenBSD: uvm_glue.c,v 1.69 2014/12/15 20:38:22 tedu Exp $ */ /* $NetBSD: uvm_glue.c,v 1.44 2001/02/06 19:54:44 eeh Exp $ */ /* @@ -467,8 +467,12 @@ uvm_atopg(vaddr_t kva) void uvm_pause(void) { - KERNEL_UNLOCK(); - KERNEL_LOCK(); + static unsigned int toggle; + if (toggle++ > 128) { + toggle = 0; + KERNEL_UNLOCK(); + KERNEL_LOCK(); + } if (curcpu()->ci_schedstate.spc_schedflags & SPCF_SHOULDYIELD) preempt(NULL); } |