Re: [PATCH v2 11/23] percpu: introduce nr_empty_pop_pages to help empty page accounting

[Josef Bacik]

On Mon, Jul 24, 2017 at 07:02:08PM -0400, Dennis Zhou wrote:
> From: "Dennis Zhou (Facebook)" <dennisszhou@xxxxxxxxx>
> 
> pcpu_nr_empty_pop_pages is used to ensure there are a handful of free
> pages around to serve atomic allocations. A new field, nr_empty_pop_pages,
> is added to the pcpu_chunk struct to keep track of the number of empty
> pages. This field is needed as the number of empty populated pages is
> globally tracked and deltas are used to update in the bitmap allocator.
> Pages that contain a hidden area are not considered to be empty. This
> new field is exposed in percpu_stats.
> 
> Signed-off-by: Dennis Zhou <dennisszhou@xxxxxxxxx>

Reviewed-by: Josef Bacik <jbacik@xxxxxx>

Thanks,

Josef