Module Name: src
Committed By: ad
Date: Sun Jan 12 13:19:32 UTC 2020
Modified Files:
src/sys/sys: param.h
Log Message:
Bump MIN_LWP_ALIGNMENT to 64.
To generate a diff of this commit:
cvs rdiff -u -r1.637 -r1.638 src/sys/sys/param.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/sys/param.h
diff -u src/sys/sys/param.h:1.637 src/sys/sys/param.h:1.638
--- src/sys/sys/param.h:1.637 Fri Jan 10 09:47:19 2020
+++ src/sys/sys/param.h Sun Jan 12 13:19:32 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: param.h,v 1.637 2020/01/10 09:47:19 ad Exp $ */
+/* $NetBSD: param.h,v 1.638 2020/01/12 13:19:32 ad Exp $ */
/*-
* Copyright (c) 1982, 1986, 1989, 1993
@@ -196,6 +196,7 @@
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> DEV_BSHIFT)
+/* Coherency unit: assumed cache line size. See also MIN_LWP_ALIGNMENT. */
#ifndef COHERENCY_UNIT
#define COHERENCY_UNIT 64
#endif
@@ -528,10 +529,11 @@ extern size_t coherency_unit;
/*
* Minimum alignment of "struct lwp" needed by the architecture.
* This counts when packing a lock byte into a word alongside a
- * pointer to an LWP.
+ * pointer to an LWP. We need a minimum of 32, but go with 64
+ * to match the cache line size.
*/
#ifndef MIN_LWP_ALIGNMENT
-#define MIN_LWP_ALIGNMENT 32
+#define MIN_LWP_ALIGNMENT 64
#endif
#endif /* !__ASSEMBLER__ */
