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authorTejun Heo <tj@kernel.org>2015-05-22 18:23:20 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:38:12 -0600
commit8a73179956e649df0d4b3250db17734f272d8266 (patch)
tree941373ecb8e170f874c6343ba35877b337f33443 /fs/fs-writeback.c
parent0d960a383ae7aa791b2833e122ba7519d264cf92 (diff)
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writeback: reorganize [__]wb_update_bandwidth()
__wb_update_bandwidth() is called from two places - fs/fs-writeback.c::balance_dirty_pages() and mm/page-writeback.c::wb_writeback(). The latter updates only the write bandwidth while the former also deals with the dirty ratelimit. The two callsites are distinguished by whether @thresh parameter is zero or not, which is cryptic. In addition, the two files define their own different versions of wb_update_bandwidth() on top of __wb_update_bandwidth(), which is confusing to say the least. This patch cleans up [__]wb_update_bandwidth() in the following ways. * __wb_update_bandwidth() now takes explicit @update_ratelimit parameter to gate dirty ratelimit handling. * mm/page-writeback.c::wb_update_bandwidth() is flattened into its caller - balance_dirty_pages(). * fs/fs-writeback.c::wb_update_bandwidth() is moved to mm/page-writeback.c and __wb_update_bandwidth() is made static. * While at it, add a lockdep assertion to __wb_update_bandwidth(). Except for the lockdep addition, this is pure reorganization and doesn't introduce any behavioral changes. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c10
1 files changed, 0 insertions, 10 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index b1b3b8184500..cd89484486f6 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1088,16 +1088,6 @@ static bool over_bground_thresh(struct bdi_writeback *wb)
}
/*
- * Called under wb->list_lock. If there are multiple wb per bdi,
- * only the flusher working on the first wb should do it.
- */
-static void wb_update_bandwidth(struct bdi_writeback *wb,
- unsigned long start_time)
-{
- __wb_update_bandwidth(wb, 0, 0, 0, 0, 0, start_time);
-}
-
-/*
* Explicit flushing or periodic writeback of "old" data.
*
* Define "old": the first time one of an inode's pages is dirtied, we mark the