Re: [PATCH 3/7] writeback: introduce smoothed global dirty limit

From: Christoph Hellwig
Date: Sun Jun 19 2011 - 11:36:45 EST

On Sun, Jun 19, 2011 at 11:01:11PM +0800, Wu Fengguang wrote:
> The start of a heavy weight application (ie. KVM) may instantly knock
> down determine_dirtyable_memory() and hence the global/bdi dirty
> thresholds.
> So introduce global_dirty_limit for tracking the global dirty threshold
> with policies
> - follow downwards slowly
> - follow up in one shot
> global_dirty_limit can effectively mask out the impact of sudden drop of
> dirtyable memory. It will be used in the next patch for two new type of
> dirty limits.

This needs to be explained in more detail in comments near the actual

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