linux-kernel - Re: [PATCH V1] mm/damon/schemes: Add the validity judgment of thresholds

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Date:   Thu, 18 Nov 2021 20:00:31 +0800
From:   Xin Hao <xhao@...ux.alibaba.com>
To:     SeongJae Park <sj@...nel.org>
Cc:     sjpark@...zon.de, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1] mm/damon/schemes: Add the validity judgment of
 thresholds


On 11/18/21 7:51 PM, SeongJae Park wrote:
> Hi Xin,
>
>
> Thank you for this patch.
>
>  From next time, please send patches for DAMON to sj@...nel.org instead of
> sjpark@...zon.de.
>
> On Thu, 18 Nov 2021 12:16:02 +0800 Xin Hao <xhao@...ux.alibaba.com> wrote:
Oh,l will.
>> In dbgfs "schemes" interface, i do some test like this:
>>      # cd /sys/kernel/debug/damon
>>      # echo "2 1 2 1 10 1 3 10 1 1 1 1 1 1 1 1 2 3" > schemes
>>      # cat schemes
>>      # 2 1 2 1 10 1 3 10 1 1 1 1 1 1 1 1 2 3 0 0
>>
>> There have some unreasonable places, i set the valules of these variables
>> "<min_sz, max_sz> <min_nr_a, max_nr_a>, <min_age, max_age>, <wmarks.high,
>> wmarks.mid, wmarks.low>" as "<2, 1>, <2, 1>, <10, 1>, <1, 2, 3>.
>>
>> So there add a validity judgment for these threshold values.
>>
>> Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
>> ---
>>   mm/damon/dbgfs.c | 11 +++++++++++
>>   1 file changed, 11 insertions(+)
>>
>> diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
>> index befb27a29aab..a4c94d563d3d 100644
>> --- a/mm/damon/dbgfs.c
>> +++ b/mm/damon/dbgfs.c
>> @@ -215,6 +215,17 @@ static struct damos **str_to_schemes(const char *str, ssize_t len,
>>   			goto fail;
>>   		}
>>   
>> +		if (min_sz > max_sz || min_nr_a > max_nr_a || min_age > max_age) {
>> +			pr_err("mininum > maxinum\n");
> I think this error message is not really needed.
Ok, i will remove it, i add this message is aim to better find where is 
wrong, because there have so many variables
>
>> +			goto fail;
>> +		}
>> +
>> +		if (wmarks.high < wmarks.mid || wmarks.high < wmarks.low ||
>> +		    wmarks.mid <  wmarks.low) {
>> +			pr_err("wrong wmarks\n");
> Ditto.
>
>
> Thanks,
> SJ
>
>> +			goto fail;
>> +		}
>> +
>>   		pos += parsed;
>>   		scheme = damon_new_scheme(min_sz, max_sz, min_nr_a, max_nr_a,
>>   				min_age, max_age, action, &quota, &wmarks);
>> -- 
>> 2.31.0

-- 
Best Regards!
Xin Hao