wmsum.h

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * This file and its contents are supplied under the terms of the
    5  * Common Development and Distribution License ("CDDL"), version 1.0.
    6  * You may only use this file in accordance with the terms of version
    7  * 1.0 of the CDDL.
    8  *
    9  * A full copy of the text of the CDDL should have accompanied this
   10  * source.  A copy of the CDDL is also available via the Internet at
   11  * http://www.illumos.org/license/CDDL.
   12  *
   13  * CDDL HEADER END
   14  */
   15 
   16 /*
   17  * wmsum counters are a reduced version of aggsum counters, optimized for
   18  * write-mostly scenarios.  They do not provide optimized read functions,
   19  * but instead allow much cheaper add function.  The primary usage is
   20  * infrequently read statistic counters, not requiring exact precision.
   21  *
   22  * In user-space due to lack of better implementation mapped to aggsum.
   23  */
   24 
   25 #ifndef _SYS_WMSUM_H
   26 #define _SYS_WMSUM_H
   27 
   28 #include <sys/aggsum.h>
   29 
   30 #ifdef  __cplusplus
   31 extern "C" {
   32 #endif
   33 
   34 #define wmsum_t aggsum_t
   35 
   36 static inline void
   37 wmsum_init(wmsum_t *ws, uint64_t value)
   38 {
   39 
   40         aggsum_init(ws, value);
   41 }
   42 
   43 static inline void
   44 wmsum_fini(wmsum_t *ws)
   45 {
   46 
   47         aggsum_fini(ws);
   48 }
   49 
   50 static inline uint64_t
   51 wmsum_value(wmsum_t *ws)
   52 {
   53 
   54         return (aggsum_value(ws));
   55 }
   56 
   57 static inline void
   58 wmsum_add(wmsum_t *ws, int64_t delta)
   59 {
   60 
   61         aggsum_add(ws, delta);
   62 }
   63 
   64 #ifdef  __cplusplus
   65 }
   66 #endif
   67 
   68 #endif /* _SYS_WMSUM_H */

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/lib/libspl/include/sys/wmsum.h

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/include/sys/wmsum.h