linux-kernel - Re: [RFC PATCH -next 11/16] mm/damon: add addr_unit for DAMON_RECLAIM and LRU

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Message-ID: <39e07350-2510-49fe-ae4a-e5d10b69291c@huawei.com>
Date: Thu, 14 Aug 2025 20:59:04 +0800
From: Quanmin Yan <yanquanmin1@...wei.com>
To: SeongJae Park <sj@...nel.org>
CC: <akpm@...ux-foundation.org>, <damon@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<wangkefeng.wang@...wei.com>, <zuoze1@...wei.com>
Subject: Re: [RFC PATCH -next 11/16] mm/damon: add addr_unit for DAMON_RECLAIM
 and LRU_SORT


在 2025/8/14 0:36, SeongJae Park 写道:
> On Wed, 13 Aug 2025 13:07:01 +0800 Quanmin Yan <yanquanmin1@...wei.com> wrote:
>
>> In module DAMON_RECLAIM and DAMON_LRU_SORT, the damon_ctx is
>> independent of the core, necessitating dedicated addr_unit
>> integration for these features.
>> Additionally, if the input monitor_region_start and monitor_region_end
>> are both 0 while addr_unit is set to a non-zero valuethe default
>> system RAM range should be divided by addr_unit.
> Do you plan to, and need to use DAMON_RECLAIM and DAMON_LRU_SORT on LPAE-ARM32
> environments?  Can't you use DAMON sysfs interface instead?  If need to use the
> modules, this change looks good to me in high level.  But if not, I'd like to
> skip this change, and wait until someone requests it.
>
> I'll review the code change in depth after the above question is answered.
>
Hi SJ,

Yes, we need to use these modules in an LPAE-ARM32 environment. The modular
approach often provides more flexibility in our workflow, so we would greatly
appreciate it if you could take some time to review the code!🙂

Thanks,
Quanmin Yan

>
> Thanks,
> SJ
>
> [...]
>