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| author | lstewart <lstewart@FreeBSD.org> | 2010-06-13 02:39:55 +0000 |
|---|---|---|
| committer | lstewart <lstewart@FreeBSD.org> | 2010-06-13 02:39:55 +0000 |
| commit | 82a6368b8628b24215cb22de6039e60e2fad7aff (patch) | |
| tree | ac0bd3aba4ff73a8dc19df84ac99938737389f60 | |
| parent | 1e5e0a78ab9d6e3cdb64ed2ff3f2fc4899dd6dee (diff) | |
| download | FreeBSD-src-82a6368b8628b24215cb22de6039e60e2fad7aff.zip FreeBSD-src-82a6368b8628b24215cb22de6039e60e2fad7aff.tar.gz | |
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
| -rw-r--r-- | sys/sys/pcpu.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sys/sys/pcpu.h b/sys/sys/pcpu.h index 1ee7717..472a658 100644 --- a/sys/sys/pcpu.h +++ b/sys/sys/pcpu.h @@ -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 |
