From: Jianyu Zhan Date: Wed, 4 Jun 2014 23:10:58 +0000 (-0700) Subject: mm/page-writeback.c: remove outdated comment X-Git-Tag: v3.16-rc1~47^2~16^2~81 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d2f3102838d90ed6ed09a6154bdb2306f7cf1548;p=platform%2Fkernel%2Flinux-exynos.git mm/page-writeback.c: remove outdated comment There is an orphaned prehistoric comment , which used to be against get_dirty_limits(), the dawn of global_dirtyable_memory().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 Acked-by: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/page-writeback.c b/mm/page-writeback.c index b9b8e82..533fa60 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