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Subject[PATCH 01/27] writeback: add bdi_dirty_limit() kernel-doc
Clarify the bdi_dirty_limit() comment.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
mm/page-writeback.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- linux-next.orig/mm/page-writeback.c 2011-03-03 14:38:12.000000000 +0800
+++ linux-next/mm/page-writeback.c 2011-03-03 14:40:52.000000000 +0800
@@ -437,10 +437,17 @@ void global_dirty_limits(unsigned long *
*pdirty = dirty;
}

-/*
+/**
* bdi_dirty_limit - @bdi's share of dirty throttling threshold
+ * @bdi: the backing_dev_info to query
+ * @dirty: global dirty limit in pages
+ *
+ * Returns @bdi's dirty limit in pages. The term "dirty" in the context of
+ * dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
+ * And the "limit" in the name is not seriously taken as hard limit in
+ * balance_dirty_pages().
*
- * Allocate high/low dirty limits to fast/slow devices, in order to prevent
+ * It allocates high/low dirty limits to fast/slow devices, in order to prevent
* - starving fast devices
* - piling up dirty pages (that will take long time to sync) on slow devices
*



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