diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2014-11-30 22:26:16 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2014-11-30 22:26:16 +0000 |
| commit | ff831e7be50a6e2e6bf9256e12d24eb4b1385a64 (patch) | |
| tree | 5e2677d756028a7a986882306319a5e2f1f78c8e /sys/arch/sparc64/include | |
| parent | 2a01c4afbe3052d3e848806555c6e5a63e4d86a4 (diff) | |
SPARC T4 and later have a pause instruction to voluntarily pause a virtual
processor in order to give other strands a chance to run. Use it in
__mp_lock_spin_hook() to avoid wasting CPU cycles if we're waiting for
the kernel or scheduler locks. This is instruction is patched in, just like
we already do for the sleep instruction on SPARC64 VI processors. We look
at the hwcap-list property of the cpu nodes in the machine description to
decide whether the pause instruction is available.
Diffstat (limited to 'sys/arch/sparc64/include')
| -rw-r--r-- | sys/arch/sparc64/include/mdesc.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/arch/sparc64/include/mdesc.h b/sys/arch/sparc64/include/mdesc.h index 5e5581bd739..bacc926141a 100644 --- a/sys/arch/sparc64/include/mdesc.h +++ b/sys/arch/sparc64/include/mdesc.h @@ -1,4 +1,4 @@ -/* $OpenBSD: mdesc.h,v 1.2 2009/05/10 12:37:01 kettenis Exp $ */ +/* $OpenBSD: mdesc.h,v 1.3 2014/11/30 22:26:14 kettenis Exp $ */ /* * Copyright (c) 2009 Mark Kettenis * @@ -42,7 +42,9 @@ extern size_t mdesc_len; void mdesc_init(void); uint64_t mdesc_get_prop_val(int, const char *); -const char * mdesc_get_prop_str(int, const char *); +const char *mdesc_get_prop_str(int, const char *); +const char *mdesc_get_prop_data(int, const char *, size_t *); int mdesc_find(const char *, uint64_t); int mdesc_find_child(int, const char *, uint64_t); +int mdesc_find_node(const char *); #endif |