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Date: Tue, 25 Jul 2017 14:29:25 -0400
From: Josef Bacik <josef@toxicpanda.com>
Subject: Re: [PATCH v2 11/23] percpu: introduce nr_empty_pop_pages to help
 empty page accounting
Message-ID: <20170725182924.GK18880@destiny>
References: <20170724230220.21774-1-dennisz@fb.com>
 <20170724230220.21774-12-dennisz@fb.com>
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In-Reply-To: <20170724230220.21774-12-dennisz@fb.com>
Sender: owner-linux-mm@kvack.org
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To: Dennis Zhou <dennisz@fb.com>
Cc: Tejun Heo <tj@kernel.org>, Christoph Lameter <cl@linux.com>, Josef Bacik <josef@toxicpanda.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel-team@fb.com, Dennis Zhou <dennisszhou@gmail.com>

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

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

Thanks,

Josef

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