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Merge branch 'urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback

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* 'urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback:
  squeeze max-pause area and drop pass-good area
This commit is contained in:
Linus Torvalds 2011-08-25 10:40:12 -07:00
commit e33f2d238e
2 changed files with 2 additions and 24 deletions
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11
include/linux/writeback.h
View File

@ -12,15 +12,6 @@
*
* (thresh - thresh/DIRTY_FULL_SCOPE, thresh)
*
* The 1/16 region above the global dirty limit will be put to maximum pauses:
*
* (limit, limit + limit/DIRTY_MAXPAUSE_AREA)
*
* The 1/16 region above the max-pause region, dirty exceeded bdi's will be put
* to loops:
*
* (limit + limit/DIRTY_MAXPAUSE_AREA, limit + limit/DIRTY_PASSGOOD_AREA)
*
* Further beyond, all dirtier tasks will enter a loop waiting (possibly long
* time) for the dirty pages to drop, unless written enough pages.
*
@ -31,8 +22,6 @@
*/
#define DIRTY_SCOPE 8
#define DIRTY_FULL_SCOPE (DIRTY_SCOPE / 2)
#define DIRTY_MAXPAUSE_AREA 16
#define DIRTY_PASSGOOD_AREA 8
/*
* 4MB minimal write chunk size

15
mm/page-writeback.c
View File

@ -754,21 +754,10 @@ static void balance_dirty_pages(struct address_space *mapping,
* 200ms is typically more than enough to curb heavy dirtiers;
* (b) the pause time limit makes the dirtiers more responsive.
*/
if (nr_dirty < dirty_thresh +
dirty_thresh / DIRTY_MAXPAUSE_AREA &&
if (nr_dirty < dirty_thresh &&
bdi_dirty < (task_bdi_thresh + bdi_thresh) / 2 &&
time_after(jiffies, start_time + MAX_PAUSE))
break;
/*
* pass-good area. When some bdi gets blocked (eg. NFS server
* not responding), or write bandwidth dropped dramatically due
* to concurrent reads, or dirty threshold suddenly dropped and
* the dirty pages cannot be brought down anytime soon (eg. on
* slow USB stick), at least let go of the good bdi's.
*/
if (nr_dirty < dirty_thresh +
dirty_thresh / DIRTY_PASSGOOD_AREA &&
bdi_dirty < bdi_thresh)
break;
/*
* Increase the delay for each loop, up to our previous