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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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24
fs/f2fs/segment.h
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@@ -683,3 +683,27 @@ static inline int nr_pages_to_skip(struct f2fs_sb_info *sbi, int type)
else
return 0;
}
/*
* When writing pages, it'd better align nr_to_write for segment size.
*/
static inline long nr_pages_to_write(struct f2fs_sb_info *sbi, int type,
struct writeback_control *wbc)
{
long nr_to_write, desired;
if (wbc->sync_mode != WB_SYNC_NONE)
return 0;
nr_to_write = wbc->nr_to_write;
if (type == DATA)
desired = 4096;
else if (type == NODE)
desired = 3 * max_hw_blocks(sbi);
else
desired = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
wbc->nr_to_write = desired;
return desired - nr_to_write;
}