Remove the bio_empty_barrier() check.

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

diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 5e21b1b..b7499ee 100644 (file)
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -80,9 +80,9 @@
  * types of locks: 1) the hash table lock array, and 2) the
  * arc list locks.
  *
- * Buffers do not have their own mutexs, rather they rely on the
- * hash table mutexs for the bulk of their protection (i.e. most
- * fields in the arc_buf_hdr_t are protected by these mutexs).
+ * Buffers do not have their own mutexes, rather they rely on the
+ * hash table mutexes for the bulk of their protection (i.e. most
+ * fields in the arc_buf_hdr_t are protected by these mutexes).
  *
  * buf_hash_find() returns the appropriate mutex (held) when it
  * locates the requested buffer in the hash table.  It returns
@@ -189,6 +189,7 @@ unsigned long zfs_arc_meta_limit = 0;
 int zfs_arc_grow_retry = 0;
 int zfs_arc_shrink_shift = 0;
 int zfs_arc_p_min_shift = 0;
+int zfs_arc_memory_throttle_disable = 1;
 int zfs_disable_dup_eviction = 0;
 int zfs_arc_meta_prune = 0;
 
@@ -2890,7 +2891,7 @@ arc_read_done(zio_t *zio)
 }
 
 /*
- * "Read" the block block at the specified DVA (in bp) via the
+ * "Read" the block at the specified DVA (in bp) via the
  * cache.  If the block is found in the cache, invoke the provided
  * callback immediately and return.  Note that the `zio' parameter
  * in the callback will be NULL in this case, since no IO was
@@ -3633,6 +3634,9 @@ arc_memory_throttle(uint64_t reserve, uint64_t inflight_data, uint64_t txg)
 #ifdef _KERNEL
        uint64_t available_memory;
 
+       if (zfs_arc_memory_throttle_disable)
+               return (0);
+
        /* Easily reclaimable memory (free + inactive + arc-evictable) */
        available_memory = ptob(spl_kmem_availrmem()) + arc_evictable_memory();
 
@@ -5042,6 +5046,12 @@ MODULE_PARM_DESC(zfs_arc_shrink_shift, "log2(fraction of arc to reclaim)");
 module_param(zfs_arc_p_min_shift, int, 0444);
 MODULE_PARM_DESC(zfs_arc_p_min_shift, "arc_c shift to calc min/max arc_p");
 
+module_param(zfs_disable_dup_eviction, int, 0644);
+MODULE_PARM_DESC(zfs_disable_dup_eviction, "disable duplicate buffer eviction");
+
+module_param(zfs_arc_memory_throttle_disable, int, 0644);
+MODULE_PARM_DESC(zfs_arc_memory_throttle_disable, "disable memory throttle");
+
 module_param(l2arc_write_max, ulong, 0444);
 MODULE_PARM_DESC(l2arc_write_max, "Max write bytes per interval");