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Partially revert "Add ddt, ddt_entry, and l2arc_hdr caches"

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This reverts only the l2arc_hdr part of commit
ecf3d9b8e6 in preparation for the illumos
5497 "lock contention on arcs_mtx" patch which does the same thing
but uses the newer two-level ARC structure following the Illumos 5408
"managing ZFS cache devices requires lots of RAM" patch.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Tim Chase 2015-01-24 12:40:59 -06:00 committed by Brian Behlendorf
parent 97639d0a52
commit ad4af89561
1 changed files with 6 additions and 10 deletions
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16
module/zfs/arc.c
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@ -797,7 +797,6 @@ buf_hash_remove(arc_buf_hdr_t *buf)
*/
static kmem_cache_t *hdr_cache;
static kmem_cache_t *buf_cache;
static kmem_cache_t *l2arc_hdr_cache;
static void
buf_fini(void)
@ -819,7 +818,6 @@ buf_fini(void)
mutex_destroy(&buf_hash_table.ht_locks[i].ht_lock);
kmem_cache_destroy(hdr_cache);
kmem_cache_destroy(buf_cache);
kmem_cache_destroy(l2arc_hdr_cache);
}
/*
@ -921,8 +919,6 @@ retry:
0, hdr_cons, hdr_dest, NULL, NULL, NULL, 0);
buf_cache = kmem_cache_create("arc_buf_t", sizeof (arc_buf_t),
0, buf_cons, buf_dest, NULL, NULL, NULL, 0);
l2arc_hdr_cache = kmem_cache_create("l2arc_buf_hdr_t", L2HDR_SIZE,
0, NULL, NULL, NULL, NULL, NULL, 0);
for (i = 0; i < 256; i++)
for (ct = zfs_crc64_table + i, *ct = i, j = 8; j > 0; j--)
@ -1598,7 +1594,7 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr)
ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize);
vdev_space_update(l2hdr->b_dev->l2ad_vdev,
-l2hdr->b_asize, 0, 0);
kmem_cache_free(l2arc_hdr_cache, l2hdr);
kmem_free(l2hdr, sizeof (l2arc_buf_hdr_t));
arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS);
if (hdr->b_state == arc_l2c_only)
l2arc_hdr_stat_remove();
@ -3738,7 +3734,7 @@ arc_release(arc_buf_t *buf, void *tag)
ARCSTAT_INCR(arcstat_l2_asize, -l2hdr->b_asize);
vdev_space_update(l2hdr->b_dev->l2ad_vdev,
-l2hdr->b_asize, 0, 0);
kmem_cache_free(l2arc_hdr_cache, l2hdr);
kmem_free(l2hdr, sizeof (l2arc_buf_hdr_t));
arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS);
ARCSTAT_INCR(arcstat_l2_size, -buf_size);
mutex_exit(&l2arc_buflist_mtx);
@ -4623,7 +4619,7 @@ l2arc_write_done(zio_t *zio)
ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize);
bytes_dropped += abl2->b_asize;
ab->b_l2hdr = NULL;
kmem_cache_free(l2arc_hdr_cache, abl2);
kmem_free(abl2, sizeof (l2arc_buf_hdr_t));
arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS);
ARCSTAT_INCR(arcstat_l2_size, -ab->b_size);
}
@ -4882,7 +4878,7 @@ top:
ARCSTAT_INCR(arcstat_l2_asize, -abl2->b_asize);
bytes_evicted += abl2->b_asize;
ab->b_l2hdr = NULL;
kmem_cache_free(l2arc_hdr_cache, abl2);
kmem_free(abl2, sizeof (l2arc_buf_hdr_t));
arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS);
ARCSTAT_INCR(arcstat_l2_size, -ab->b_size);
}
@ -5028,9 +5024,9 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz,
/*
* Create and add a new L2ARC header.
*/
l2hdr = kmem_cache_alloc(l2arc_hdr_cache, KM_SLEEP);
l2hdr = kmem_zalloc(sizeof (l2arc_buf_hdr_t),
KM_PUSHPAGE);
l2hdr->b_dev = dev;
l2hdr->b_daddr = 0;
arc_space_consume(L2HDR_SIZE, ARC_SPACE_L2HDRS);
ab->b_flags |= ARC_L2_WRITING;