diff options
| -rw-r--r-- | Documentation/admin-guide/xfs.rst | 29 | ||||
| -rw-r--r-- | fs/xfs/xfs_zone_gc.c | 10 |
2 files changed, 16 insertions, 23 deletions
diff --git a/Documentation/admin-guide/xfs.rst b/Documentation/admin-guide/xfs.rst index 3e76276bd488..5becb441c3cb 100644 --- a/Documentation/admin-guide/xfs.rst +++ b/Documentation/admin-guide/xfs.rst @@ -562,7 +562,7 @@ The interesting knobs for XFS workqueues are as follows: Zoned Filesystems ================= -For zoned file systems, the following attribute is exposed in: +For zoned file systems, the following attributes are exposed in: /sys/fs/xfs/<dev>/zoned/ @@ -572,23 +572,10 @@ For zoned file systems, the following attribute is exposed in: is limited by the capabilities of the backing zoned device, file system size and the max_open_zones mount option. -Zoned Filesystems -================= - -For zoned file systems, the following attributes are exposed in: - - /sys/fs/xfs/<dev>/zoned/ - - max_open_zones (Min: 1 Default: Varies Max: UINTMAX) - This read-only attribute exposes the maximum number of open zones - available for data placement. The value is determined at mount time and - is limited by the capabilities of the backing zoned device, file system - size and the max_open_zones mount option. - - zonegc_low_space (Min: 0 Default: 0 Max: 100) - Define a percentage for how much of the unused space that GC should keep - available for writing. A high value will reclaim more of the space - occupied by unused blocks, creating a larger buffer against write - bursts at the cost of increased write amplification. Regardless - of this value, garbage collection will always aim to free a minimum - amount of blocks to keep max_open_zones open for data placement purposes. + zonegc_low_space (Min: 0 Default: 0 Max: 100) + Define a percentage for how much of the unused space that GC should keep + available for writing. A high value will reclaim more of the space + occupied by unused blocks, creating a larger buffer against write + bursts at the cost of increased write amplification. Regardless + of this value, garbage collection will always aim to free a minimum + amount of blocks to keep max_open_zones open for data placement purposes. diff --git a/fs/xfs/xfs_zone_gc.c b/fs/xfs/xfs_zone_gc.c index 8c541ca71872..81c94dd1d596 100644 --- a/fs/xfs/xfs_zone_gc.c +++ b/fs/xfs/xfs_zone_gc.c @@ -170,7 +170,8 @@ bool xfs_zoned_need_gc( struct xfs_mount *mp) { - s64 available, free; + s64 available, free, threshold; + s32 remainder; if (!xfs_group_marked(mp, XG_TYPE_RTG, XFS_RTG_RECLAIMABLE)) return false; @@ -183,7 +184,12 @@ xfs_zoned_need_gc( return true; free = xfs_estimate_freecounter(mp, XC_FREE_RTEXTENTS); - if (available < mult_frac(free, mp->m_zonegc_low_space, 100)) + + threshold = div_s64_rem(free, 100, &remainder); + threshold = threshold * mp->m_zonegc_low_space + + remainder * div_s64(mp->m_zonegc_low_space, 100); + + if (available < threshold) return true; return false; |