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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-04-29 16:58:39 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-04-30 12:07:32 +0900
commitac5d156c78a68b39955ee9b09498ba93831c77d7 (patch)
tree638245b8a39332d3bb2878c5a0a8574e518fcc37 /fs/f2fs/namei.c
parentb743ba78ae4c7c6a6e08e623af824b6208f58019 (diff)
downloadlinux-ac5d156c78a68b39955ee9b09498ba93831c77d7.tar.bz2
f2fs: modify the number of issued pages to merge IOs
When testing f2fs on an SSD, I found some 128 page IOs followed by 1 page IO were issued by f2fs_write_node_pages. This means that there were some mishandling flows which degrades performance. Previous f2fs_write_node_pages determines the number of pages to be written, nr_to_write, as follows. 1. The bio_get_nr_vecs returns 129 pages. 2. The bio_alloc makes a room for 128 pages. 3. The initial 128 pages go into one bio. 4. The existing bio is submitted, and a new bio is prepared for the last 1 page. 5. Finally, sync_node_pages submits the last 1 page bio. The problem is from the use of bio_get_nr_vecs, so this patch replace it with max_hw_blocks using queue_max_sectors. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/namei.c')
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