Date: Sun, 13 Jun 2010 02:39:55 +0000 (UTC) From: Lawrence Stewart <lstewart@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r209119 - head/sys/sys Message-ID: <201006130239.o5D2du3m086332@svn.freebsd.org>
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Author: lstewart Date: Sun Jun 13 02:39:55 2010 New Revision: 209119 URL: http://svn.freebsd.org/changeset/base/209119 Log: Add a utility macro to simplify calculating an aggregate sum from a DPCPU counter variable. Sponsored by: FreeBSD Foundation Reviewed by: jhb, rpaulo, rwatson (previous version of patch) MFC after: 1 week Modified: head/sys/sys/pcpu.h Modified: head/sys/sys/pcpu.h ============================================================================== --- head/sys/sys/pcpu.h Sun Jun 13 01:27:29 2010 (r209118) +++ head/sys/sys/pcpu.h Sun Jun 13 02:39:55 2010 (r209119) @@ -106,6 +106,17 @@ extern uintptr_t dpcpu_off[]; #define DPCPU_ID_GET(i, n) (*DPCPU_ID_PTR(i, n)) #define DPCPU_ID_SET(i, n, v) (*DPCPU_ID_PTR(i, n) = v) +/* + * Utility macros. + */ +#define DPCPU_SUM(n, var, sum) \ +do { \ + (sum) = 0; \ + u_int i; \ + CPU_FOREACH(i) \ + (sum) += (DPCPU_ID_PTR(i, n))->var; \ +} while (0) + /* * XXXUPS remove as soon as we have per cpu variable * linker sets and can define rm_queue in _rm_lock.h
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