linux-kernel - Re: [PATCH 1/2] zram: add a parameter "node

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Message-Id: <20230902155529.61384b25aae68abb9c262552@linux-foundation.org>
Date:   Sat, 2 Sep 2023 15:55:29 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Ze Zuo <zuoze1@...wei.com>
Cc:     <minchan@...nel.org>, <senozhatsky@...omium.org>,
        <axboe@...nel.dk>, <ying.huang@...el.com>,
        <aneesh.kumar@...ux.ibm.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>,
        <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH 1/2] zram: add a parameter "node_id" for zram

On Fri, 1 Sep 2023 15:19:41 +0800 Ze Zuo <zuoze1@...wei.com> wrote:

> Add a parameter "node_id" to zram to support storing pages on specific
> node_id node memory.

Please document this in Documentation/admin-guide/blockdev/zram.rst

Should it be a group of nodes rather than a single one?  If this
feature is useful, people will want that.

> Now, zram memory allocation is random, however in some cases, specifying
> specific nodes for memory allocation for zram may have good effects. In
> addition, when memory tier is supported, demotion can be achieved not
> only through page migration,  it is also possible to apply for memory by
> specifying zram on low-speed device nodes, such as CXL memory devices,
> and compressing pages to these devices through memory reclamation to
> achieve similar effects to migration.

Are any performance testing results available from using this feature?