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Introduce zfs_refcount_(add|remove)_few().

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There are two places where we need to add/remove several references
with semantics of zfs_refcount_(add|remove). But when debug/tracing
is disabled, it is a crime to run multiple atomic_inc() in a loop,
especially under congested pool-wide allocator lock.

Introduced new functions implement the same semantics as the loop,
but without overhead in production builds.

Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #14934
This commit is contained in:
Alexander Motin
2023-06-05 14:51:44 -04:00
committed by GitHub
parent dae3c549f5
commit 5ba4025a8d
4 changed files with 30 additions and 9 deletions
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module/zfs/refcount.c
+18
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@@ -151,6 +151,15 @@ zfs_refcount_add(zfs_refcount_t *rc, const void *holder)
return (zfs_refcount_add_many(rc, 1, holder));
}
void
zfs_refcount_add_few(zfs_refcount_t *rc, uint64_t number, const void *holder)
{
if (!rc->rc_tracked)
(void) zfs_refcount_add_many(rc, number, holder);
else for (; number > 0; number--)
(void) zfs_refcount_add(rc, holder);
}
int64_t
zfs_refcount_remove_many(zfs_refcount_t *rc, uint64_t number,
const void *holder)
@@ -204,6 +213,15 @@ zfs_refcount_remove(zfs_refcount_t *rc, const void *holder)
return (zfs_refcount_remove_many(rc, 1, holder));
}
void
zfs_refcount_remove_few(zfs_refcount_t *rc, uint64_t number, const void *holder)
{
if (!rc->rc_tracked)
(void) zfs_refcount_remove_many(rc, number, holder);
else for (; number > 0; number--)
(void) zfs_refcount_remove(rc, holder);
}
void
zfs_refcount_transfer(zfs_refcount_t *dst, zfs_refcount_t *src)
{