linux-kernel - Re: [PATCH v3 30/48] mm/damon: Stop using vma_mas

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Message-Id: <20230117191109.116438-1-sj@kernel.org>
Date:   Tue, 17 Jan 2023 19:11:09 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     brendanhiggins@...gle.com, kunit-dev@...glegroups.com,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        SeongJae Park <sj@...nel.org>,
        "damon@...ts.linux.dev" <damon@...ts.linux.dev>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v3 30/48] mm/damon: Stop using vma_mas_store() for maple tree store

Cc-ing kunit people.

Hi Liam,


Could we put touching file name on the summary?
E.g., mm/damon/vaddr-test: Stop using ...

On Tue, 17 Jan 2023 02:34:19 +0000 Liam Howlett <liam.howlett@...cle.com> wrote:

> From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
> 
> Prepare for the removal of the vma_mas_store() function by open coding
> the maple tree store in this test code.  Set the range of the maple
> state and call the store function directly.
> 
> Cc: SeongJae Park <sj@...nel.org>
> Cc: damon@...ts.linux.dev
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> ---
>  mm/damon/vaddr-test.h | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/damon/vaddr-test.h b/mm/damon/vaddr-test.h
> index bce37c487540..6098933d3272 100644
> --- a/mm/damon/vaddr-test.h
> +++ b/mm/damon/vaddr-test.h
> @@ -14,19 +14,26 @@
>  
>  #include <kunit/test.h>
>  
> -static void __link_vmas(struct maple_tree *mt, struct vm_area_struct *vmas,
> +static int __link_vmas(struct maple_tree *mt, struct vm_area_struct *vmas,
>  			ssize_t nr_vmas)
>  {
> -	int i;
> +	int i, ret = -ENOMEM;
>  	MA_STATE(mas, mt, 0, 0);
>  
>  	if (!nr_vmas)
> -		return;
> +		return -ENOENT;
>  
>  	mas_lock(&mas);
> -	for (i = 0; i < nr_vmas; i++)
> -		vma_mas_store(&vmas[i], &mas);
> +	for (i = 0; i < nr_vmas; i++) {
> +		mas_set_range(&mas, vmas[i].vm_start, vmas[i].vm_end - 1);
> +		if (mas_store_gfp(&mas, &vmas[i], GFP_KERNEL))
> +			goto failed;
> +	}
> +	ret = 0;
> +
> +failed:
>  	mas_unlock(&mas);
> +	return ret;
>  }
>  
>  /*
> @@ -71,7 +78,7 @@ static void damon_test_three_regions_in_vmas(struct kunit *test)
>  	};
>  
>  	mt_init_flags(&mm.mm_mt, MM_MT_FLAGS);
> -	__link_vmas(&mm.mm_mt, vmas, ARRAY_SIZE(vmas));
> +	KUNIT_EXPECT_EQ(test, __link_vmas(&mm.mm_mt, vmas, ARRAY_SIZE(vmas)), 0);

In case of the __link_vmas() failure, I think we should skip this test using
'kunit_skip()', rather marking this test failed.


Thanks,
SJ

>  
>  	__damon_va_three_regions(&mm, regions);
>  
> -- 
> 2.35.1