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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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11
fs/f2fs/checkpoint.c
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@@ -187,18 +187,19 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_SB(mapping->host->i_sb);
int nrpages = nr_pages_to_skip(sbi, META);
long written;
long diff, written;
/* collect a number of dirty meta pages and write together */
if (wbc->for_kupdate || get_pages(sbi, F2FS_DIRTY_META) < nrpages)
if (wbc->for_kupdate ||
get_pages(sbi, F2FS_DIRTY_META) < nr_pages_to_skip(sbi, META))
goto skip_write;
/* if mounting is failed, skip writing node pages */
mutex_lock(&sbi->cp_mutex);
written = sync_meta_pages(sbi, META, nrpages);
diff = nr_pages_to_write(sbi, META, wbc);
written = sync_meta_pages(sbi, META, wbc->nr_to_write);
mutex_unlock(&sbi->cp_mutex);
wbc->nr_to_write -= written;
wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
return 0;
skip_write: