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Date: Fri, 3 Mar 2023 09:42:04 +0800
From: Kefeng Wang <wangkefeng.wang@...wei.com>
To: SeongJae Park <sj@...nel.org>
CC: Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>, <damon@...ts.linux.dev>
Subject: Re: [PATCH -next] mm/damon/paddr: minor refactor of
damon_pa_pageout()
On 2023/3/3 0:47, SeongJae Park wrote:
> Hi Kefeng,
>
> On Thu, 2 Mar 2023 22:49:26 +0800 Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
>> Omit two lines by converting if(!folio_isolate_lru()) to
>> if(folio_isolate_lru()).
>>
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> ---
>> mm/damon/paddr.c | 12 +++++-------
>> 1 file changed, 5 insertions(+), 7 deletions(-)
>>
>> diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
>> index 6c655d9b5639..a557f3c9300f 100644
>> --- a/mm/damon/paddr.c
>> +++ b/mm/damon/paddr.c
>> @@ -246,14 +246,12 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
>>
>> folio_clear_referenced(folio);
>> folio_test_clear_young(folio);
>> - if (!folio_isolate_lru(folio)) {
>> - folio_put(folio);
>> - continue;
>> + if (folio_isolate_lru(folio)) {
>> + if (folio_test_unevictable(folio))
>> + folio_putback_lru(folio);
>> + else
>> + list_add(&folio->lru, &folio_list);
>> }
>> - if (folio_test_unevictable(folio))
>> - folio_putback_lru(folio);
>> - else
>> - list_add(&folio->lru, &folio_list);
>> folio_put(folio);
>> }
>
> This looks ok to me, thank you for your effort! Nevertheless, I don't like
> increasing depth as much as number of lines. The
> more-than-3-levels-of-indentation[1] warning is not always right, but this 4
> levels of indentation is not making me so exciting.
>
> What do you think about adding put_continue label and using it, not only here,
> but also above part? For example:
>
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -239,21 +239,18 @@ static unsigned long damon_pa_pageout(struct damon_region *r, struct damos *s)
> if (!folio)
> continue;
>
> - if (damos_pa_filter_out(s, folio)) {
> - folio_put(folio);
> - continue;
> - }
> + if (damos_pa_filter_out(s, folio))
> + goto put_continue;
>
> folio_clear_referenced(folio);
> folio_test_clear_young(folio);
> - if (!folio_isolate_lru(folio)) {
> - folio_put(folio);
> - continue;
> - }
> + if (!folio_isolate_lru(folio))
> + goto put_continue;
> if (folio_test_unevictable(folio))
> folio_putback_lru(folio);
> else
> list_add(&folio->lru, &folio_list);
> +put_continue:
> folio_put(folio);
> }
> applied = reclaim_pages(&folio_list);
>
> It omits three lines.
It looks good, will update, thanks
>
> $ git diff --stat
> mm/damon/paddr.c | 13 +++++--------
> 1 file changed, 5 insertions(+), 8 deletions(-)
>
> [1] https://docs.kernel.org/process/coding-style.html#indentation
>
>
> Thanks,
> SJ
>
>> applied = reclaim_pages(&folio_list);
>> --
>> 2.35.3
>>
>>
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