linux-kernel - Re: [PATCH v2 06/23] percpu: end chunk area maps page aligned for the populated bitmap

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Message-ID: <20170725181431.GF18880@destiny>
Date:   Tue, 25 Jul 2017 14:14:31 -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 06/23] percpu: end chunk area maps page aligned for
 the populated bitmap

On Mon, Jul 24, 2017 at 07:02:03PM -0400, Dennis Zhou wrote:
> From: "Dennis Zhou (Facebook)" <dennisszhou@...il.com>
> 
> The area map allocator manages the first chunk area by hiding all but
> the region it is responsible for serving in the area map. To align this
> with the populated page bitmap, end_offset is introduced to keep track
> of the delta to end page aligned. The area map is appended with the
> page aligned end when necessary to be in line with how the bitmap
> allocator requires the ending to be aligned with the LCM of PAGE_SIZE
> and the size of each bitmap block. percpu_stats is updated to ignore
> this region when present.
> 
> Signed-off-by: Dennis Zhou <dennisszhou@...il.com>

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

Thanks,

Josef