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authorBrian Behlendorf <[email protected]>2015-05-30 09:57:53 -0500
committerBrian Behlendorf <[email protected]>2015-06-11 10:27:25 -0700
commitf6046738365571bd647f804958dfdff8a32fbde4 (patch)
treea3018bea5c47c04a0c109c84793a8f21e26814ce /include
parentc5528b9ba622421a213e128704de4090fa0db773 (diff)
Make arc_prune() asynchronous
As described in the comment above arc_adapt_thread() it is critical that the arc_adapt_thread() function never sleep while holding a hash lock. This behavior was possible in the Linux implementation because the arc_prune() logic was implemented to be synchronous. Under illumos the analogous dnlc_reduce_cache() function is asynchronous. To address this the arc_do_user_prune() function is has been reworked in to two new functions as follows: * arc_prune_async() is an asynchronous implementation which dispatches the prune callback to be run by the system taskq. This makes it suitable to use in the context of the arc_adapt_thread(). * arc_prune() is a synchronous implementation which depends on the arc_prune_async() implementation but blocks until the outstanding callbacks complete. This is used in arc_kmem_reap_now() where it is safe, and expected, that memory will be freed. This patch additionally adds the zfs_arc_meta_strategy module option while allows the meta reclaim strategy to be configured. It defaults to a balanced strategy which has been proved to work well under Linux but the illumos meta-only strategy can be enabled. Signed-off-by: Tim Chase <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]>
Diffstat (limited to 'include')
-rw-r--r--include/sys/arc.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/sys/arc.h b/include/sys/arc.h
index 38f9f27fe..0961d4b4d 100644
--- a/include/sys/arc.h
+++ b/include/sys/arc.h
@@ -59,10 +59,16 @@ arc_done_func_t arc_getbuf_func;
struct arc_prune {
arc_prune_func_t *p_pfunc;
void *p_private;
+ uint64_t p_adjust;
list_node_t p_node;
refcount_t p_refcnt;
};
+typedef enum arc_strategy {
+ ARC_STRATEGY_META_ONLY = 0, /* Evict only meta data buffers */
+ ARC_STRATEGY_META_BALANCED = 1, /* Evict data buffers if needed */
+} arc_strategy_t;
+
typedef enum arc_flags
{
/*