linux-kernel - Re: [PATCH] z3fold: encode object length in the handle

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Message-Id: <20181025124249.0ba63f1041ed8836ff6e6190@linux-foundation.org>
Date:   Thu, 25 Oct 2018 12:42:49 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vitaly Wool <vitalywool@...il.com>
Cc:     Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
        Oleksiy.Avramchenko@...y.com, Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH] z3fold: encode object length in the handle

On Thu, 25 Oct 2018 11:28:21 +0200 Vitaly Wool <vitalywool@...il.com> wrote:

> Reclaim and free can race on an object (which is basically ok) but
> in order for reclaim to be able to  map "freed" object we need to
> encode object length in the handle. handle_to_chunks() is thus
> introduced to extract object length from a handle and use it during
> mapping of the last object we couldn't correctly map before.

What are the runtime effects of this change?

Thanks.