linux-kernel - Re: [RFC PATCH] mm: skip GFP

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Date:   Mon, 10 Oct 2022 06:09:43 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "zhaoyang.huang" <zhaoyang.huang@...soc.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Zhaoyang Huang <huangzhaoyang@...il.com>, linux-mm@...ck.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ke.wang@...soc.com, steve.kang@...soc.com
Subject: Re: [RFC PATCH] mm: skip GFP_IO if swap is zram only

On Mon, Oct 10, 2022 at 07:00:22PM +0800, zhaoyang.huang wrote:
> From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> 
> __GFP_IO is believed to prevent the allocation being suspended due to accessing
> physical block devices when reclaiming dirty pages. Zram is not considered as
> such kind of device from kernel perspective of view. Do swap things if the system
> is zram only.

No, zram is not in any way special, and for sure not important enough
to add special case hacks to the VM code.