From: Pankaj Raghav <p.raghav@samsung.com>
Set the preferred folio order in the fgp_flags by calling
fgf_set_order(). Page cache will try to allocate large folio of the
preferred order whenever possible instead of allocating multiple 0 order
folios.
This improves the buffered write performance up to 1.25x with default
mount options and up to 1.57x when mounted with no_data_io option with
the following fio workload:
fio --name=bcachefs --filename=/mnt/test --size=100G \
--ioengine=io_uring --iodepth=16 --rw=write --bs=128k
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
---
fs/bcachefs/fs-io-buffered.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/bcachefs/fs-io-buffered.c b/fs/bcachefs/fs-io-buffered.c
index 865691dd0173..1355d618f988 100644
--- a/fs/bcachefs/fs-io-buffered.c
+++ b/fs/bcachefs/fs-io-buffered.c
@@ -677,7 +677,8 @@ int bch2_write_begin(struct file *file, struct address_space *mapping,
bch2_pagecache_add_get(inode);
- folio = __filemap_get_folio(mapping, pos >> PAGE_SHIFT, FGP_WRITEBEGIN,
+ folio = __filemap_get_folio(mapping, pos >> PAGE_SHIFT,
+ FGP_WRITEBEGIN | fgf_set_order(len),
mapping_gfp_mask(mapping));
if (IS_ERR_OR_NULL(folio))
goto err_unlock;
@@ -819,7 +820,7 @@ static int __bch2_buffered_write(struct bch_inode_info *inode,
darray_init(&fs);
ret = bch2_filemap_get_contig_folios_d(mapping, pos, end,
- FGP_WRITEBEGIN,
+ FGP_WRITEBEGIN | fgf_set_order(len),
mapping_gfp_mask(mapping), &fs);
if (ret)
goto out;
--
2.44.1