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| author | Chris Mason <chris.mason@oracle.com> | 2009-08-07 09:28:20 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-09-11 13:31:04 -0400 |
| commit | a97adc9fffb1707da4e97f91c801660c6be92aac (patch) | |
| tree | 9385c1ada9d5b86b75cd00865bacc6bc39deaa9d | |
| parent | 4f878e8475a465ddbd951e06a23317303f1b5b30 (diff) | |
| download | blackbird-obmc-linux-a97adc9fffb1707da4e97f91c801660c6be92aac.tar.gz blackbird-obmc-linux-a97adc9fffb1707da4e97f91c801660c6be92aac.zip | |
Btrfs: use larger nr_to_write for larger extents
When btrfs fills a large delayed allocation extent, it is a good idea
to try and convince the write_cache_pages caller to go ahead and
write a good chunk of that extent. The extra IO is basically free
because we know it is contiguous.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/extent_io.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 7e5c5a0749e2..8d7a152a90c6 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2135,6 +2135,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, delalloc_end = 0; page_started = 0; if (!epd->extent_locked) { + u64 delalloc_to_write; /* * make sure the wbc mapping index is at least updated * to this page. @@ -2154,6 +2155,14 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc, tree->ops->fill_delalloc(inode, page, delalloc_start, delalloc_end, &page_started, &nr_written); + delalloc_to_write = (delalloc_end - + max_t(u64, page_offset(page), + delalloc_start) + 1) >> + PAGE_CACHE_SHIFT; + if (wbc->nr_to_write < delalloc_to_write) { + wbc->nr_to_write = min_t(long, 8192, + delalloc_to_write); + } delalloc_start = delalloc_end + 1; } @@ -2350,7 +2359,6 @@ static int extent_write_cache_pages(struct extent_io_tree *tree, writepage_t writepage, void *data, void (*flush_fn)(void *)) { - struct backing_dev_info *bdi = mapping->backing_dev_info; int ret = 0; int done = 0; struct pagevec pvec; @@ -2425,10 +2433,6 @@ retry: } if (ret || wbc->nr_to_write <= 0) done = 1; - if (wbc->nonblocking && bdi_write_congested(bdi)) { - wbc->encountered_congestion = 1; - done = 1; - } } pagevec_release(&pvec); cond_resched(); |
