mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-12-28 20:09:35 +03:00
7736b68376
Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #16479
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/*
|
|
* CDDL HEADER START
|
|
*
|
|
* This file and its contents are supplied under the terms of the
|
|
* Common Development and Distribution License ("CDDL"), version 1.0.
|
|
* You may only use this file in accordance with the terms of version
|
|
* 1.0 of the CDDL.
|
|
*
|
|
* A full copy of the text of the CDDL should have accompanied this
|
|
* source. A copy of the CDDL is also available via the Internet at
|
|
* http://www.illumos.org/license/CDDL.
|
|
*
|
|
* CDDL HEADER END
|
|
*/
|
|
|
|
/*
|
|
* wmsum counters are a reduced version of aggsum counters, optimized for
|
|
* write-mostly scenarios. They do not provide optimized read functions,
|
|
* but instead allow much cheaper add function. The primary usage is
|
|
* infrequently read statistic counters, not requiring exact precision.
|
|
*
|
|
* The Linux implementation is directly mapped into percpu_counter KPI.
|
|
*/
|
|
|
|
#ifndef _SYS_WMSUM_H
|
|
#define _SYS_WMSUM_H
|
|
|
|
#include <linux/percpu_counter.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
typedef struct percpu_counter wmsum_t;
|
|
|
|
static inline void
|
|
wmsum_init(wmsum_t *ws, uint64_t value)
|
|
{
|
|
percpu_counter_init(ws, value, GFP_KERNEL);
|
|
}
|
|
|
|
static inline void
|
|
wmsum_fini(wmsum_t *ws)
|
|
{
|
|
|
|
percpu_counter_destroy(ws);
|
|
}
|
|
|
|
static inline uint64_t
|
|
wmsum_value(wmsum_t *ws)
|
|
{
|
|
|
|
return (percpu_counter_sum(ws));
|
|
}
|
|
|
|
static inline void
|
|
wmsum_add(wmsum_t *ws, int64_t delta)
|
|
{
|
|
|
|
percpu_counter_add_batch(ws, delta, INT_MAX / 2);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _SYS_WMSUM_H */
|