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f2fs: introduce nr_pages_to_write for segment alignment

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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>
This commit is contained in:
Jaegeuk Kim
2014-03-18 13:47:11 +09:00
parent d3baf95da5
commit 50c8cdb35a
4 changed files with 36 additions and 19 deletions
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8
fs/f2fs/node.c
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@@ -1202,7 +1202,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
long nr_to_write = wbc->nr_to_write;
long diff;
/* balancing f2fs's metadata in background */
f2fs_balance_fs_bg(sbi);
@@ -1211,12 +1211,10 @@ static int f2fs_write_node_pages(struct address_space *mapping,
if (get_pages(sbi, F2FS_DIRTY_NODES) < nr_pages_to_skip(sbi, NODE))
goto skip_write;
/* if mounting is failed, skip writing node pages */
wbc->nr_to_write = 3 * max_hw_blocks(sbi);
diff = nr_pages_to_write(sbi, NODE, wbc);
wbc->sync_mode = WB_SYNC_NONE;
sync_node_pages(sbi, 0, wbc);
wbc->nr_to_write = nr_to_write - (3 * max_hw_blocks(sbi) -
wbc->nr_to_write);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - diff);
return 0;
skip_write: