Remove "arc_meta_used" from arc_adjust calculation

Using "arc_meta_used" to determine if the arc's mru list is over it's target value of "arc_p" doesn't seem correct. The size of the mru list and the value of "arc_meta_used", although related, are completely independent. Buffers contained in "arc_meta_used" may not even be contained in the arc's mru list. As such, this patch removes "arc_meta_used" from the calculation in arc_adjust. Signed-off-by: Prakash Surya <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Issue openzfs#2110
behlendorf · Feb 22, 2014 · 77765b5 · 77765b5
1 parent 94520ca
commit 77765b5
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
@@ -2144,8 +2144,7 @@ arc_adjust(void)
 	 */
 
 	adjustment = MIN((int64_t)(arc_size - arc_c),
-	    (int64_t)(arc_anon->arcs_size + arc_mru->arcs_size + arc_meta_used -
-	    arc_p));
+	    (int64_t)(arc_anon->arcs_size + arc_mru->arcs_size - arc_p));
 
 	if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_DATA] > 0) {
 		delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_DATA], adjustment);