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;
+ arc_reclaim = MAX(btop(((int64_t)arc_size - (int64_t)arc_c_min))
+ >> arc_shrink_shift, 0);
if (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 (!(gfp_mask & __GFP_FS))
+ return (-1);
+
/* Reclaim in progress */
if (mutex_tryenter(&arc_reclaim_thr_lock) == 0)
return (-1);
}
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);
EXPORT_SYMBOL(arc_buf_remove_ref);
EXPORT_SYMBOL(arc_getbuf_func);
-module_param(zfs_arc_min, ulong, 0644);
-MODULE_PARM_DESC(zfs_arc_min, "Minimum arc size");
+module_param(zfs_arc_min, ulong, 0444);
+MODULE_PARM_DESC(zfs_arc_min, "Min arc size");
-module_param(zfs_arc_max, ulong, 0644);
-MODULE_PARM_DESC(zfs_arc_max, "Maximum arc size");
+module_param(zfs_arc_max, ulong, 0444);
+MODULE_PARM_DESC(zfs_arc_max, "Max arc size");
-module_param(zfs_arc_meta_limit, ulong, 0644);
+module_param(zfs_arc_meta_limit, ulong, 0444);
MODULE_PARM_DESC(zfs_arc_meta_limit, "Meta limit for arc size");
-module_param(arc_reduce_dnlc_percent, uint, 0644);
-MODULE_PARM_DESC(arc_reduce_dnlc_percent, "Meta reclaim percentage");
+module_param(zfs_arc_reduce_dnlc_percent, int, 0444);
+MODULE_PARM_DESC(zfs_arc_reduce_dnlc_percent, "Meta reclaim percentage");
+
+module_param(zfs_arc_grow_retry, int, 0444);
+MODULE_PARM_DESC(zfs_arc_grow_retry, "Seconds before growing arc size");
+
+module_param(zfs_arc_shrink_shift, int, 0444);
+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");
+
#endif