Change l2arc_norw default to zero

[zfs.git] / module / zfs / arc.c

diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index de86966..dca17ab 100644 (file)
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -640,7 +640,7 @@ unsigned long l2arc_feed_secs = L2ARC_FEED_SECS;    /* interval seconds */
 unsigned long l2arc_feed_min_ms = L2ARC_FEED_MIN_MS;   /* min interval msecs */
 int l2arc_noprefetch = B_TRUE;                 /* don't cache prefetch bufs */
 int l2arc_feed_again = B_TRUE;                 /* turbo warmup */
-int l2arc_norw = B_TRUE;                       /* no reads during writes */
+int l2arc_norw = B_FALSE;                      /* no reads during writes */
 
 /*
  * L2ARC Internals
@@ -1545,6 +1545,7 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr)
                        list_remove(l2hdr->b_dev->l2ad_buflist, hdr);
                        ARCSTAT_INCR(arcstat_l2_size, -hdr->b_size);
                        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();
                        hdr->b_l2hdr = NULL;
@@ -1642,7 +1643,7 @@ int
 arc_buf_remove_ref(arc_buf_t *buf, void* tag)
 {
        arc_buf_hdr_t *hdr = buf->b_hdr;
-       kmutex_t *hash_lock = HDR_LOCK(hdr);
+       kmutex_t *hash_lock = NULL;
        int no_callback = (buf->b_efunc == NULL);
 
        if (hdr->b_state == arc_anon) {
@@ -1651,6 +1652,7 @@ arc_buf_remove_ref(arc_buf_t *buf, void* tag)
                return (no_callback);
        }
 
+       hash_lock = HDR_LOCK(hdr);
        mutex_enter(hash_lock);
        hdr = buf->b_hdr;
        ASSERT3P(hash_lock, ==, HDR_LOCK(hdr));
@@ -3442,6 +3444,7 @@ arc_release(arc_buf_t *buf, void *tag)
        if (l2hdr) {
                list_remove(l2hdr->b_dev->l2ad_buflist, hdr);
                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);
        }
@@ -4141,14 +4144,14 @@ l2arc_write_interval(clock_t began, uint64_t wanted, uint64_t wrote)
 static void
 l2arc_hdr_stat_add(void)
 {
-       ARCSTAT_INCR(arcstat_l2_hdr_size, HDR_SIZE + L2HDR_SIZE);
+       ARCSTAT_INCR(arcstat_l2_hdr_size, HDR_SIZE);
        ARCSTAT_INCR(arcstat_hdr_size, -HDR_SIZE);
 }
 
 static void
 l2arc_hdr_stat_remove(void)
 {
-       ARCSTAT_INCR(arcstat_l2_hdr_size, -(HDR_SIZE + L2HDR_SIZE));
+       ARCSTAT_INCR(arcstat_l2_hdr_size, -HDR_SIZE);
        ARCSTAT_INCR(arcstat_hdr_size, HDR_SIZE);
 }
 
@@ -4292,6 +4295,7 @@ l2arc_write_done(zio_t *zio)
                        abl2 = ab->b_l2hdr;
                        ab->b_l2hdr = NULL;
                        kmem_free(abl2, sizeof (l2arc_buf_hdr_t));
+                       arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS);
                        ARCSTAT_INCR(arcstat_l2_size, -ab->b_size);
                }
 
@@ -4538,6 +4542,7 @@ top:
                                abl2 = ab->b_l2hdr;
                                ab->b_l2hdr = NULL;
                                kmem_free(abl2, sizeof (l2arc_buf_hdr_t));
+                               arc_space_return(L2HDR_SIZE, ARC_SPACE_L2HDRS);
                                ARCSTAT_INCR(arcstat_l2_size, -ab->b_size);
                        }
                        list_remove(buflist, ab);
@@ -4663,6 +4668,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
                                            KM_PUSHPAGE);
                        hdrl2->b_dev = dev;
                        hdrl2->b_daddr = dev->l2ad_hand;
+                       arc_space_consume(L2HDR_SIZE, ARC_SPACE_L2HDRS);
 
                        ab->b_flags |= ARC_L2_WRITING;
                        ab->b_l2hdr = hdrl2;