X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=module%2Fzfs%2Farc.c;h=ff631e61b2eaa2eaf04d2ad1712f6f17db554060;hb=3e31d2b080b4e6665a93691d171a13d7e29a768a;hp=f1f972b86ddea02861d2b3d8035d3ec70d3023c4;hpb=c409e4647f221ab724a0bd10c480ac95447203c3;p=zfs.git

diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index f1f972b..ff631e6 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -582,14 +582,14 @@ uint64_t zfs_crc64_table[256];
 /*
  * L2ARC Performance Tunables
  */
-uint64_t l2arc_write_max = L2ARC_WRITE_SIZE;	/* default max write size */
-uint64_t l2arc_write_boost = L2ARC_WRITE_SIZE;	/* extra write during warmup */
-uint64_t l2arc_headroom = L2ARC_HEADROOM;	/* number of dev writes */
-uint64_t l2arc_feed_secs = L2ARC_FEED_SECS;	/* interval seconds */
-uint64_t l2arc_feed_min_ms = L2ARC_FEED_MIN_MS;	/* min interval milliseconds */
-boolean_t l2arc_noprefetch = B_TRUE;		/* don't cache prefetch bufs */
-boolean_t l2arc_feed_again = B_TRUE;		/* turbo warmup */
-boolean_t l2arc_norw = B_TRUE;			/* no reads during writes */
+unsigned long l2arc_write_max = L2ARC_WRITE_SIZE;	/* def max write size */
+unsigned long l2arc_write_boost = L2ARC_WRITE_SIZE;	/* extra warmup write */
+unsigned long l2arc_headroom = L2ARC_HEADROOM;		/* # of dev writes */
+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 */
 
 /*
  * L2ARC Internals
@@ -2191,20 +2191,26 @@ arc_reclaim_thread(void)
  * direct reclaim will be trigger.  In direct reclaim a more aggressive
  * strategy is used, data is evicted from the ARC and free slabs reaped.
  */
-SPL_SHRINKER_CALLBACK_PROTO(arc_shrinker_func, cb, nr_to_scan, gfp_mask)
+static int
+__arc_shrinker_func(struct shrinker *shrink, struct shrink_control *sc)
 {
 	arc_reclaim_strategy_t strategy;
 	int arc_reclaim;
 
-	/* Not allowed to perform filesystem reclaim */
-	if (!(gfp_mask & __GFP_FS))
-		return (-1);
-
 	/* Return number of reclaimable pages based on arc_shrink_shift */
-	arc_reclaim = btop((arc_size - arc_c_min)) >> arc_shrink_shift;
-	if (nr_to_scan == 0)
+	arc_reclaim = MAX(btop(((int64_t)arc_size - (int64_t)arc_c_min))
+	    >> arc_shrink_shift, 0);
+	if (sc->nr_to_scan == 0)
 		return (arc_reclaim);
 
+	/* Prevent reclaim below arc_c_min */
+	if (arc_reclaim <= 0)
+		return (-1);
+
+	/* Not allowed to perform filesystem reclaim */
+	if (!(sc->gfp_mask & __GFP_FS))
+		return (-1);
+
 	/* Reclaim in progress */
 	if (mutex_tryenter(&arc_reclaim_thr_lock) == 0)
 		return (-1);
@@ -2218,11 +2224,13 @@ SPL_SHRINKER_CALLBACK_PROTO(arc_shrinker_func, cb, nr_to_scan, gfp_mask)
 	}
 
 	arc_kmem_reap_now(strategy);
-	arc_reclaim = btop((arc_size - arc_c_min)) >> arc_shrink_shift;
+	arc_reclaim = MAX(btop(((int64_t)arc_size - (int64_t)arc_c_min))
+	    >> arc_shrink_shift, 0);
 	mutex_exit(&arc_reclaim_thr_lock);
 
 	return (arc_reclaim);
 }
+SPL_SHRINKER_CALLBACK_WRAPPER(arc_shrinker_func);
 
 SPL_SHRINKER_DECLARE(arc_shrinker, arc_shrinker_func, DEFAULT_SEEKS);
 #endif /* _KERNEL */
@@ -4788,4 +4796,28 @@ 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(l2arc_write_max, ulong, 0444);
+MODULE_PARM_DESC(l2arc_write_max, "Max write bytes per interval");
+
+module_param(l2arc_write_boost, ulong, 0444);
+MODULE_PARM_DESC(l2arc_write_boost, "Extra write bytes during device warmup");
+
+module_param(l2arc_headroom, ulong, 0444);
+MODULE_PARM_DESC(l2arc_headroom, "Number of max device writes to precache");
+
+module_param(l2arc_feed_secs, ulong, 0444);
+MODULE_PARM_DESC(l2arc_feed_secs, "Seconds between L2ARC writing");
+
+module_param(l2arc_feed_min_ms, ulong, 0444);
+MODULE_PARM_DESC(l2arc_feed_min_ms, "Min feed interval in milliseconds");
+
+module_param(l2arc_noprefetch, int, 0444);
+MODULE_PARM_DESC(l2arc_noprefetch, "Skip caching prefetched buffers");
+
+module_param(l2arc_feed_again, int, 0444);
+MODULE_PARM_DESC(l2arc_feed_again, "Turbo L2ARC warmup");
+
+module_param(l2arc_norw, int, 0444);
+MODULE_PARM_DESC(l2arc_norw, "No reads during writes");
+
 #endif