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| author | Wu Fengguang <fengguang.wu@intel.com> | 2011-05-04 19:54:37 -0600 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-07-09 22:09:01 -0700 |
| commit | d46db3d58233be4be980eb1e42eebe7808bcabab (patch) | |
| tree | 6d813b33938d915f0c0633e8615d1ffdcc554c96 /mm/backing-dev.c | |
| parent | 36715cef0770b7e2547892b7c3197fc024274630 (diff) | |
| download | lwn-d46db3d58233be4be980eb1e42eebe7808bcabab.tar.gz lwn-d46db3d58233be4be980eb1e42eebe7808bcabab.zip | |
writeback: make writeback_control.nr_to_write straight
Pass struct wb_writeback_work all the way down to writeback_sb_inodes(),
and initialize the struct writeback_control there.
struct writeback_control is basically designed to control writeback of a
single file, but we keep abuse it for writing multiple files in
writeback_sb_inodes() and its callers.
It immediately clean things up, e.g. suddenly wbc.nr_to_write vs
work->nr_pages starts to make sense, and instead of saving and restoring
pages_skipped in writeback_sb_inodes it can always start with a clean
zero value.
It also makes a neat IO pattern change: large dirty files are now
written in the full 4MB writeback chunk size, rather than whatever
remained quota in wbc->nr_to_write.
Acked-by: Jan Kara <jack@suse.cz>
Proposed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 5f6553ef1ba7..7ba303be5e03 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -260,18 +260,6 @@ int bdi_has_dirty_io(struct backing_dev_info *bdi) return wb_has_dirty_io(&bdi->wb); } -static void bdi_flush_io(struct backing_dev_info *bdi) -{ - struct writeback_control wbc = { - .sync_mode = WB_SYNC_NONE, - .older_than_this = NULL, - .range_cyclic = 1, - .nr_to_write = 1024, - }; - - writeback_inodes_wb(&bdi->wb, &wbc); -} - /* * kupdated() used to do this. We cannot do it from the bdi_forker_thread() * or we risk deadlocking on ->s_umount. The longer term solution would be @@ -457,9 +445,10 @@ static int bdi_forker_thread(void *ptr) if (IS_ERR(task)) { /* * If thread creation fails, force writeout of - * the bdi from the thread. + * the bdi from the thread. Hopefully 1024 is + * large enough for efficient IO. */ - bdi_flush_io(bdi); + writeback_inodes_wb(&bdi->wb, 1024); } else { /* * The spinlock makes sure we do not lose |