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authorJianyu Zhan <nasa4836@gmail.com>2014-06-04 16:10:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:54:13 -0700
commitd2f3102838d90ed6ed09a6154bdb2306f7cf1548 (patch)
treee6b1f767b51051e0c5b68994f5c1fd3ef5e4f877
parent50088c440910730baf3248acfad2c846fb3eea77 (diff)
mm/page-writeback.c: remove outdated comment
There is an orphaned prehistoric comment , which used to be against get_dirty_limits(), the dawn of global_dirtyable_memory(). Back then, the implementation of get_dirty_limits() is complicated and full of magic numbers, so this comment is necessary. But we now use the clear and neat global_dirtyable_memory(), which renders this comment ambiguous and useless. Remove it. Signed-off-by: Jianyu Zhan <nasa4836@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/page-writeback.c18
1 files changed, 0 insertions, 18 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index b9b8e820462..533fa60c9ac 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -156,24 +156,6 @@ static unsigned long writeout_period_time = 0;
#define VM_COMPLETIONS_PERIOD_LEN (3*HZ)
/*
- * Work out the current dirty-memory clamping and background writeout
- * thresholds.
- *
- * The main aim here is to lower them aggressively if there is a lot of mapped
- * memory around. To avoid stressing page reclaim with lots of unreclaimable
- * pages. It is better to clamp down on writers than to start swapping, and
- * performing lots of scanning.
- *
- * We only allow 1/2 of the currently-unmapped memory to be dirtied.
- *
- * We don't permit the clamping level to fall below 5% - that is getting rather
- * excessive.
- *
- * We make sure that the background writeout level is below the adjusted
- * clamping level.
- */
-
-/*
* In a memory zone, there is a certain amount of pages we consider
* available for the page cache, which is essentially the number of
* free and reclaimable pages, minus some zone reserves to protect