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Split "data_size" into "meta" and "data" 

Previously, the "data_size" field in the arcstats kstat contained the
amount of cached "metadata" and "data" in the ARC. The problem is this
then made it difficult to extract out just the "metadata" size, or just
the "data" size.

To make it easier to distinguish the two values, "data_size" has been
modified to count only buffers of type ARC_BUFC_DATA, and "meta_size"
was added to count only buffers of type ARC_BUFC_METADATA. If one wants
the old "data_size" value, simply sum the new "data_size" and
"meta_size" values.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #2110
This commit is contained in:
Prakash Surya 2014-02-03 12:41:47 -08:00 committed by Brian Behlendorf
parent da8ccd0ee0
commit cc7f677c16
2 changed files with 25 additions and 14 deletions
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1
include/sys/arc.h
View File

@ -86,6 +86,7 @@ typedef enum arc_buf_contents {
*/
typedef enum arc_space_type {
ARC_SPACE_DATA,
ARC_SPACE_META,
ARC_SPACE_HDRS,
ARC_SPACE_L2HDRS,
ARC_SPACE_OTHER,

28
module/zfs/arc.c
View File

@ -308,6 +308,7 @@ typedef struct arc_stats {
kstat_named_t arcstat_size;
kstat_named_t arcstat_hdr_size;
kstat_named_t arcstat_data_size;
kstat_named_t arcstat_meta_size;
kstat_named_t arcstat_other_size;
kstat_named_t arcstat_anon_size;
kstat_named_t arcstat_anon_evict_data;
@ -395,6 +396,7 @@ static arc_stats_t arc_stats = {
{ "size", KSTAT_DATA_UINT64 },
{ "hdr_size", KSTAT_DATA_UINT64 },
{ "data_size", KSTAT_DATA_UINT64 },
{ "meta_size", KSTAT_DATA_UINT64 },
{ "other_size", KSTAT_DATA_UINT64 },
{ "anon_size", KSTAT_DATA_UINT64 },
{ "anon_evict_data", KSTAT_DATA_UINT64 },
@ -1367,6 +1369,9 @@ arc_space_consume(uint64_t space, arc_space_type_t type)
case ARC_SPACE_DATA:
ARCSTAT_INCR(arcstat_data_size, space);
break;
case ARC_SPACE_META:
ARCSTAT_INCR(arcstat_meta_size, space);
break;
case ARC_SPACE_OTHER:
ARCSTAT_INCR(arcstat_other_size, space);
break;
@ -1378,7 +1383,9 @@ arc_space_consume(uint64_t space, arc_space_type_t type)
break;
}
if (type != ARC_SPACE_DATA)
ARCSTAT_INCR(arcstat_meta_used, space);
atomic_add_64(&arc_size, space);
}
@ -1393,6 +1400,9 @@ arc_space_return(uint64_t space, arc_space_type_t type)
case ARC_SPACE_DATA:
ARCSTAT_INCR(arcstat_data_size, -space);
break;
case ARC_SPACE_META:
ARCSTAT_INCR(arcstat_meta_size, -space);
break;
case ARC_SPACE_OTHER:
ARCSTAT_INCR(arcstat_other_size, -space);
break;
@ -1404,10 +1414,13 @@ arc_space_return(uint64_t space, arc_space_type_t type)
break;
}
if (type != ARC_SPACE_DATA) {
ASSERT(arc_meta_used >= space);
if (arc_meta_max < arc_meta_used)
arc_meta_max = arc_meta_used;
ARCSTAT_INCR(arcstat_meta_used, -space);
}
ASSERT(arc_size >= space);
atomic_add_64(&arc_size, -space);
}
@ -1604,12 +1617,11 @@ arc_buf_destroy(arc_buf_t *buf, boolean_t recycle, boolean_t all)
if (!recycle) {
if (type == ARC_BUFC_METADATA) {
arc_buf_data_free(buf, zio_buf_free);
arc_space_return(size, ARC_SPACE_DATA);
arc_space_return(size, ARC_SPACE_META);
} else {
ASSERT(type == ARC_BUFC_DATA);
arc_buf_data_free(buf, zio_data_buf_free);
ARCSTAT_INCR(arcstat_data_size, -size);
atomic_add_64(&arc_size, -size);
arc_space_return(size, ARC_SPACE_DATA);
}
}
if (list_link_active(&buf->b_hdr->b_arc_node)) {
@ -2759,12 +2771,11 @@ arc_get_data_buf(arc_buf_t *buf)
if (!arc_evict_needed(type)) {
if (type == ARC_BUFC_METADATA) {
buf->b_data = zio_buf_alloc(size);
arc_space_consume(size, ARC_SPACE_DATA);
arc_space_consume(size, ARC_SPACE_META);
} else {
ASSERT(type == ARC_BUFC_DATA);
buf->b_data = zio_data_buf_alloc(size);
ARCSTAT_INCR(arcstat_data_size, size);
atomic_add_64(&arc_size, size);
arc_space_consume(size, ARC_SPACE_DATA);
}
goto out;
}
@ -2809,7 +2820,7 @@ arc_get_data_buf(arc_buf_t *buf)
if ((buf->b_data = arc_evict(state, 0, size, recycle, evict)) == NULL) {
if (type == ARC_BUFC_METADATA) {
buf->b_data = zio_buf_alloc(size);
arc_space_consume(size, ARC_SPACE_DATA);
arc_space_consume(size, ARC_SPACE_META);
/*
* If we are unable to recycle an existing meta buffer
@ -2824,8 +2835,7 @@ arc_get_data_buf(arc_buf_t *buf)
} else {
ASSERT(type == ARC_BUFC_DATA);
buf->b_data = zio_data_buf_alloc(size);
ARCSTAT_INCR(arcstat_data_size, size);
atomic_add_64(&arc_size, size);
arc_space_consume(size, ARC_SPACE_DATA);
}
/* Only bump this if we tried to recycle and failed */