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MFV r247174:

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Expose arc_meta_limit, et al via kstats.

Note that as a result, vfs.zfs.arc_meta_used is removed.
The existing vfs.zfs.arc_meta_limit sysctl/tunable is retained
with a SYSCTL_PROC wrapper.

Illumos ZFS issues:
    3561 arc_meta_limit should be exposed via kstats

Relnotes:	yes
MFC after:	2 weeks
This commit is contained in:
Xin LI 2014-12-13 19:17:28 +00:00
commit 5571af1d8f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=275748
1 changed files with 42 additions and 10 deletions
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52
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -205,6 +205,7 @@ uint64_t zfs_arc_average_blocksize = 8 * 1024; /* 8KB */
u_int zfs_arc_free_target = 0;
static int sysctl_vfs_zfs_arc_free_target(SYSCTL_HANDLER_ARGS);
static int sysctl_vfs_zfs_arc_meta_limit(SYSCTL_HANDLER_ARGS);
#ifdef _KERNEL
static void
@ -259,6 +260,15 @@ sysctl_vfs_zfs_arc_free_target(SYSCTL_HANDLER_ARGS)
return (0);
}
/*
* Must be declared here, before the definition of corresponding kstat
* macro which uses the same names will confuse the compiler.
*/
SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_meta_limit,
CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RW, 0, sizeof(uint64_t),
sysctl_vfs_zfs_arc_meta_limit, "QU",
"ARC metadata limit");
#endif
/*
@ -413,6 +423,9 @@ typedef struct arc_stats {
kstat_named_t arcstat_duplicate_buffers;
kstat_named_t arcstat_duplicate_buffers_size;
kstat_named_t arcstat_duplicate_reads;
kstat_named_t arcstat_meta_used;
kstat_named_t arcstat_meta_limit;
kstat_named_t arcstat_meta_max;
} arc_stats_t;
static arc_stats_t arc_stats = {
@ -490,7 +503,10 @@ static arc_stats_t arc_stats = {
{ "memory_throttle_count", KSTAT_DATA_UINT64 },
{ "duplicate_buffers", KSTAT_DATA_UINT64 },
{ "duplicate_buffers_size", KSTAT_DATA_UINT64 },
{ "duplicate_reads", KSTAT_DATA_UINT64 }
{ "duplicate_reads", KSTAT_DATA_UINT64 },
{ "arc_meta_used", KSTAT_DATA_UINT64 },
{ "arc_meta_limit", KSTAT_DATA_UINT64 },
{ "arc_meta_max", KSTAT_DATA_UINT64 }
};
#define ARCSTAT(stat) (arc_stats.stat.value.ui64)
@ -552,6 +568,9 @@ static arc_state_t *arc_l2c_only;
#define arc_c ARCSTAT(arcstat_c) /* target size of cache */
#define arc_c_min ARCSTAT(arcstat_c_min) /* min target cache size */
#define arc_c_max ARCSTAT(arcstat_c_max) /* max target cache size */
#define arc_meta_limit ARCSTAT(arcstat_meta_limit) /* max size for metadata */
#define arc_meta_used ARCSTAT(arcstat_meta_used) /* size of metadata */
#define arc_meta_max ARCSTAT(arcstat_meta_max) /* max size of metadata */
#define L2ARC_IS_VALID_COMPRESS(_c_) \
((_c_) == ZIO_COMPRESS_LZ4 || (_c_) == ZIO_COMPRESS_EMPTY)
@ -559,13 +578,6 @@ static arc_state_t *arc_l2c_only;
static int arc_no_grow; /* Don't try to grow cache size */
static uint64_t arc_tempreserve;
static uint64_t arc_loaned_bytes;
static uint64_t arc_meta_used;
static uint64_t arc_meta_limit;
static uint64_t arc_meta_max = 0;
SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, arc_meta_used, CTLFLAG_RD, &arc_meta_used, 0,
"ARC metadata used");
SYSCTL_UQUAD(_vfs_zfs, OID_AUTO, arc_meta_limit, CTLFLAG_RW, &arc_meta_limit, 0,
"ARC metadata limit");
typedef struct l2arc_buf_hdr l2arc_buf_hdr_t;
@ -626,6 +638,26 @@ struct arc_buf_hdr {
list_node_t b_l2node;
};
#ifdef _KERNEL
static int
sysctl_vfs_zfs_arc_meta_limit(SYSCTL_HANDLER_ARGS)
{
uint64_t val;
int err;
val = arc_meta_limit;
err = sysctl_handle_64(oidp, &val, 0, req);
if (err != 0 || req->newptr == NULL)
return (err);
if (val <= 0 || val > arc_c_max)
return (EINVAL);
arc_meta_limit = val;
return (0);
}
#endif
static arc_buf_t *arc_eviction_list;
static kmutex_t arc_eviction_mtx;
static arc_buf_hdr_t arc_eviction_hdr;
@ -1479,7 +1511,7 @@ arc_space_consume(uint64_t space, arc_space_type_t type)
break;
}
atomic_add_64(&arc_meta_used, space);
ARCSTAT_INCR(arcstat_meta_used, space);
atomic_add_64(&arc_size, space);
}
@ -1506,7 +1538,7 @@ arc_space_return(uint64_t space, arc_space_type_t type)
ASSERT(arc_meta_used >= space);
if (arc_meta_max < arc_meta_used)
arc_meta_max = arc_meta_used;
atomic_add_64(&arc_meta_used, -space);
ARCSTAT_INCR(arcstat_meta_used, -space);
ASSERT(arc_size >= space);
atomic_add_64(&arc_size, -space);
}