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  * The FreeBSD implementation is directly mapped into counter(9) KPI.
   23  */
   24 
   25 #ifndef _SYS_WMSUM_H
   26 #define _SYS_WMSUM_H
   27 
   28 #include <sys/types.h>
   29 #include <sys/systm.h>
   30 #include <sys/counter.h>
   31 #include <sys/malloc.h>
   32 
   33 #ifdef  __cplusplus
   34 extern "C" {
   35 #endif
   36 
   37 #define wmsum_t counter_u64_t
   38 
   39 static inline void
   40 wmsum_init(wmsum_t *ws, uint64_t value)
   41 {
   42 
   43         *ws = counter_u64_alloc(M_WAITOK);
   44         counter_u64_add(*ws, value);
   45 }
   46 
   47 static inline void
   48 wmsum_fini(wmsum_t *ws)
   49 {
   50 
   51         counter_u64_free(*ws);
   52 }
   53 
   54 static inline uint64_t
   55 wmsum_value(wmsum_t *ws)
   56 {
   57 
   58         return (counter_u64_fetch(*ws));
   59 }
   60 
   61 static inline void
   62 wmsum_add(wmsum_t *ws, int64_t delta)
   63 {
   64 
   65         counter_u64_add(*ws, delta);
   66 }
   67 
   68 #ifdef  __cplusplus
   69 }
   70 #endif
   71 
   72 #endif /* _SYS_WMSUM_H */

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This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/include/os/freebsd/spl/sys/wmsum.h

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/os/freebsd/spl/sys/wmsum.h