Commit d2f31028 authored by Jianyu Zhan's avatar Jianyu Zhan Committed by Linus Torvalds

mm/page-writeback.c: remove outdated comment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: default avatarJianyu Zhan <nasa4836@gmail.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 50088c44
...@@ -155,24 +155,6 @@ static unsigned long writeout_period_time = 0; ...@@ -155,24 +155,6 @@ static unsigned long writeout_period_time = 0;
*/ */
#define VM_COMPLETIONS_PERIOD_LEN (3*HZ) #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 * In a memory zone, there is a certain amount of pages we consider
* available for the page cache, which is essentially the number of * available for the page cache, which is essentially the number of
......
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