linux-kernel - Re: [PATCH v2 11/23] percpu: introduce nr_empty_pop

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Message-ID: <20170725182924.GK18880@destiny>
Date:   Tue, 25 Jul 2017 14:29:25 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Dennis Zhou <dennisz@...com>
Cc:     Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-team@...com, Dennis Zhou <dennisszhou@...il.com>
Subject: Re: [PATCH v2 11/23] percpu: introduce nr_empty_pop_pages to help
 empty page accounting

On Mon, Jul 24, 2017 at 07:02:08PM -0400, Dennis Zhou wrote:
> From: "Dennis Zhou (Facebook)" <dennisszhou@...il.com>
> 
> 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@...il.com>

Reviewed-by: Josef Bacik <jbacik@...com>

Thanks,

Josef