linux-kernel - Re: [PATCH v3 11/11] mm/damon: add damon_ctx->min_sz

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Message-Id: <20250917142900.e2915812cd94d9a2b0da3987@linux-foundation.org>
Date: Wed, 17 Sep 2025 14:29:00 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: SeongJae Park <sj@...nel.org>
Cc: Quanmin Yan <yanquanmin1@...wei.com>, damon@...ts.linux.dev,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 wangkefeng.wang@...wei.com, zuoze1@...wei.com, Chris Mason <clm@...com>
Subject: Re: [PATCH v3 11/11] mm/damon: add damon_ctx->min_sz_region

On Wed, 17 Sep 2025 09:00:41 -0700 SeongJae Park <sj@...nel.org> wrote:

> On Thu, 28 Aug 2025 10:12:42 -0700 SeongJae Park <sj@...nel.org> wrote:
> 
> > From: Quanmin Yan <yanquanmin1@...wei.com>
> > 
> > Adopting addr_unit would make DAMON_MINREGION 'addr_unit * 4096'
> > bytes and cause data alignment issues[1].
> > 
> > Add damon_ctx->min_sz_region to change DAMON_MIN_REGION from a global
> > macro value to per-context variable.
> > 
> > [1] https://lore.kernel.org/all/527714dd-0e33-43ab-bbbd-d89670ba79e7@huawei.com
> 
> I think I found an issue of this patch.  Please refer to the attaching patch
> for details.
> 
> This patch is in the mm tree and not yet merged into the mainline.  Andrew,
> could you please add the attached patch as a fixup of this one?

The flawed patch is actually in mm.git's mm-stable branch, which is
supposedly non-rebasing.  So I queued this patch as separate commit, with

Fixes: d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region")