[PATCH 2/2] xfs: Improve default maximum number of open zones

[Damien Le Moal <dlemoal@kernel.org>]

For regular block devices using the zoned allocator, the default
maximum number of open zones is set to 1/4 of the number of realtime
groups. For a large capacity device, this leads to a very large limit.
E.g. with a 26 TB HDD:

mount /dev/sdb /mnt
...
XFS (sdb): 95836 zones of 65536 blocks size (23959 max open)

In turn such large limit on the number of open zones can lead, depending
on the workload, on a very large number of concurrent write streams
which devices generally do not handle well, leading to poor performance.

Introduce the default limit XFS_DEFAULT_MAX_OPEN_ZONES, defined as 128
to match the hardware limit of most SMR HDDs available today, and use
this limit to set mp->m_max_open_zones in xfs_calc_open_zones() instead
of calling xfs_max_open_zones(), when the user did not specify a limit
with the max_open_zones mount option.

For the 26 TB HDD example, we now get:

mount /dev/sdb /mnt
...
XFS (sdb): 95836 zones of 65536 blocks (128 max open zones)

This change does not prevent the user from specifying a lareger number
for the open zones limit. E.g.

mount -o max_open_zones=4096 /dev/sdb /mnt
...
XFS (sdb): 95836 zones of 65536 blocks (4096 max open zones)

Finally, since xfs_calc_open_zones() checks and caps the
mp->m_max_open_zones limit against the value calculated by
xfs_max_open_zones() for any type of device, this new default limit does
not increase m_max_open_zones for small capacity devices.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 fs/xfs/libxfs/xfs_zones.h | 7 +++++++
 fs/xfs/xfs_zone_alloc.c   | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/libxfs/xfs_zones.h b/fs/xfs/libxfs/xfs_zones.h
index c4f1367b2cca..6005f5412363 100644
--- a/fs/xfs/libxfs/xfs_zones.h
+++ b/fs/xfs/libxfs/xfs_zones.h
@@ -29,6 +29,13 @@ struct xfs_rtgroup;
 #define XFS_OPEN_GC_ZONES	1U
 #define XFS_MIN_OPEN_ZONES	(XFS_OPEN_GC_ZONES + 1U)
 
+/*
+ * For zoned device that do not have a limit on the number of open zones, and
+ * for reguilar devices using the zoned allocator, use this value as the default
+ * limit on the number of open zones.
+ */
+#define XFS_DEFAULT_MAX_OPEN_ZONES	128
+
 bool xfs_zone_validate(struct blk_zone *zone, struct xfs_rtgroup *rtg,
 	xfs_rgblock_t *write_pointer);
 
diff --git a/fs/xfs/xfs_zone_alloc.c b/fs/xfs/xfs_zone_alloc.c
index f152b2182004..1147bacb2da8 100644
--- a/fs/xfs/xfs_zone_alloc.c
+++ b/fs/xfs/xfs_zone_alloc.c
@@ -1131,7 +1131,7 @@ xfs_calc_open_zones(
 		if (bdev_open_zones)
 			mp->m_max_open_zones = bdev_open_zones;
 		else
-			mp->m_max_open_zones = xfs_max_open_zones(mp);
+			mp->m_max_open_zones = XFS_DEFAULT_MAX_OPEN_ZONES;
 	}
 
 	if (mp->m_max_open_zones < XFS_MIN_OPEN_ZONES) {
-- 
2.51.0