diff options
Diffstat (limited to 'module/zfs')
| -rw-r--r-- | module/zfs/arc.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/module/zfs/arc.c b/module/zfs/arc.c index ce9246061..acf98dd2d 100644 --- a/module/zfs/arc.c +++ b/module/zfs/arc.c @@ -319,6 +319,11 @@ static int arc_p_min_shift = 4; /* log2(fraction of arc to reclaim) */ static int arc_shrink_shift = 7; +/* percent of pagecache to reclaim arc to */ +#ifdef _KERNEL +static uint_t zfs_arc_pc_percent = 0; +#endif + /* * log2(fraction of ARC which must be free to allow growing). * I.e. If there is less than arc_c >> arc_no_grow_shift free memory, @@ -4377,10 +4382,18 @@ arc_evictable_memory(void) refcount_count(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]); uint64_t arc_dirty = MAX((int64_t)arc_size - (int64_t)arc_clean, 0); - if (arc_dirty >= arc_c_min) + /* + * Scale reported evictable memory in proportion to page cache, cap + * at specified min/max. + */ + uint64_t min = (ptob(global_page_state(NR_FILE_PAGES)) / 100) * + zfs_arc_pc_percent; + min = MAX(arc_c_min, MIN(arc_c_max, min)); + + if (arc_dirty >= min) return (arc_clean); - return (MAX((int64_t)arc_size - (int64_t)arc_c_min, 0)); + return (MAX((int64_t)arc_size - (int64_t)min, 0)); } /* @@ -7754,6 +7767,10 @@ MODULE_PARM_DESC(zfs_arc_p_dampener_disable, "disable arc_p adapt dampener"); module_param(zfs_arc_shrink_shift, int, 0644); MODULE_PARM_DESC(zfs_arc_shrink_shift, "log2(fraction of arc to reclaim)"); +module_param(zfs_arc_pc_percent, uint, 0644); +MODULE_PARM_DESC(zfs_arc_pc_percent, + "Percent of pagecache to reclaim arc to"); + module_param(zfs_arc_p_min_shift, int, 0644); MODULE_PARM_DESC(zfs_arc_p_min_shift, "arc_c shift to calc min/max arc_p"); |