f2fs: introduce nr_pages_to_write for segment alignment
This patch introduces nr_pages_to_write to align page writes to the segment
or other operational unit size, which can be tuned according to the system
environment.
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 4e0e7ba..7f4665e 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -851,8 +851,6 @@
return AOP_WRITEPAGE_ACTIVATE;
}
-#define MAX_DESIRED_PAGES_WP 4096
-
static int __f2fs_writepage(struct page *page, struct writeback_control *wbc,
void *data)
{
@@ -869,7 +867,7 @@
struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
bool locked = false;
int ret;
- long excess_nrtw = 0, desired_nrtw;
+ long diff;
/* deal with chardevs and other special file */
if (!mapping->a_ops->writepage)
@@ -879,11 +877,7 @@
get_dirty_dents(inode) < nr_pages_to_skip(sbi, DATA))
goto skip_write;
- if (wbc->nr_to_write < MAX_DESIRED_PAGES_WP) {
- desired_nrtw = MAX_DESIRED_PAGES_WP;
- excess_nrtw = desired_nrtw - wbc->nr_to_write;
- wbc->nr_to_write = desired_nrtw;
- }
+ diff = nr_pages_to_write(sbi, DATA, wbc);
if (!S_ISDIR(inode->i_mode)) {
mutex_lock(&sbi->writepages);
@@ -897,7 +891,7 @@
remove_dirty_dir_inode(inode);
- wbc->nr_to_write -= excess_nrtw;
+ wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
return ret;
skip_write: