Author: jhb
Date: Mon Feb 9 21:03:23 2015
New Revision: 278474
URL: https://svnweb.freebsd.org/changeset/base/278474
Log:
Use __builtin_popcnt() to implement a BIT_COUNT() operation for bitsets and
use this to implement CPU_COUNT() to count the number of CPUs in a cpuset.
MFC after: 2 weeks
Modified:
head/sys/sys/bitset.h
head/sys/sys/cpuset.h
Modified: head/sys/sys/bitset.h
==============================================================================
--- head/sys/sys/bitset.h Mon Feb 9 21:00:56 2015 (r278473)
+++ head/sys/sys/bitset.h Mon Feb 9 21:03:23 2015 (r278474)
@@ -176,4 +176,14 @@
__bit; \
})
+#define BIT_COUNT(_s, p) __extension__ ({
\
+ __size_t __i; \
+ int __count; \
+ \
+ __count = 0; \
+ for (__i = 0; __i < __bitset_words((_s)); __i++) \
+ __count += __builtin_popcount((p)->__bits[__i]); \
+ __count; \
+})
+
#endif /* !_SYS_BITSET_H_ */
Modified: head/sys/sys/cpuset.h
==============================================================================
--- head/sys/sys/cpuset.h Mon Feb 9 21:00:56 2015 (r278473)
+++ head/sys/sys/cpuset.h Mon Feb 9 21:03:23 2015 (r278474)
@@ -60,6 +60,7 @@
#define CPU_OR_ATOMIC(d, s) BIT_OR_ATOMIC(CPU_SETSIZE, d, s)
#define CPU_COPY_STORE_REL(f, t) BIT_COPY_STORE_REL(CPU_SETSIZE,
f, t)
#define CPU_FFS(p) BIT_FFS(CPU_SETSIZE, p)
+#define CPU_COUNT(p) BIT_COUNT(CPU_SETSIZE, p)
/*
* Valid cpulevel_t values.
_______________________________________________
svn-src-head@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
