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mm/page-writeback.c: print a warning if the vm dirtiness settings are illogical

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The vm direct limit setting must be set greater than vm background limit
setting.  Otherwise print a warning to help the operator to figure out
that the vm dirtiness settings is in illogical state.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Yafang Shao <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Yafang Shao 2017-11-15 17:33:45 -08:00 • committed by Linus Torvalds
commit 0f6d24f878
2 changed files with 11 additions and 1 deletions
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5
mm/page-writeback.c
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@ -433,8 +433,11 @@ static void domain_dirty_limits(struct dirty_throttle_control *dtc)
else
bg_thresh = (bg_ratio * available_memory) / PAGE_SIZE;
if (bg_thresh >= thresh)
if (unlikely(bg_thresh >= thresh)) {
pr_warn("vm direct limit must be set greater than background limit.\n");
bg_thresh = thresh / 2;
}
tsk = current;
if (tsk->flags & PF_LESS_THROTTLE || rt_task(tsk)) {
bg_thresh += bg_thresh / 4 + global_wb_domain.dirty_limit / 32;