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SubjectRe: [External] Re: vmscan: Reclaim unevictable pages
From
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On 3/15/19 11:11 AM, Pankaj Suryawanshi wrote:
>
> [ cc Aneesh kumar, Anshuman, Hillf, Vlastimil]

Can you send a proper patch with changelog explaining the change? I
don't know the context of this thread.

> From: Pankaj Suryawanshi
> Sent: 15 March 2019 11:35:05
> To: Kirill Tkhai; Michal Hocko
> Cc: linux-kernel@vger.kernel.org; minchan@kernel.org; linux-mm@kvack.org
> Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
>
>
>
> [ cc linux-mm ]
>
>
> From: Pankaj Suryawanshi
> Sent: 14 March 2019 19:14:40
> To: Kirill Tkhai; Michal Hocko
> Cc: linux-kernel@vger.kernel.org; minchan@kernel.org
> Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
>
>
>
> Hello ,
>
> Please ignore the curly braces, they are just for debugging.
>
> Below is the updated patch.
>
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index be56e2e..12ac353 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -998,7 +998,7 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> sc->nr_scanned++;
>
> if (unlikely(!page_evictable(page)))
> - goto activate_locked;
> + goto cull_mlocked;
>
> if (!sc->may_unmap && page_mapped(page))
> goto keep_locked;
> @@ -1331,7 +1331,12 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> } else
> list_add(&page->lru, &free_pages);
> continue;
> -
> +cull_mlocked:
> + if (PageSwapCache(page))
> + try_to_free_swap(page);
> + unlock_page(page);
> + list_add(&page->lru, &ret_pages);
> + continue;
> activate_locked:
> /* Not a candidate for swapping, so reclaim swap space. */
> if (PageSwapCache(page) && (mem_cgroup_swap_full(page) ||
>
>
>
> Regards,
> Pankaj
>
>
> From: Kirill Tkhai <ktkhai@virtuozzo.com>
> Sent: 14 March 2019 14:55:34
> To: Pankaj Suryawanshi; Michal Hocko
> Cc: linux-kernel@vger.kernel.org; minchan@kernel.org
> Subject: Re: Re: [External] Re: vmscan: Reclaim unevictable pages
>
>
> On 14.03.2019 11:52, Pankaj Suryawanshi wrote:
>>
>> I am using kernel version 4.14.65 (on Android pie [ARM]).
>>
>> No additional patches applied on top of vanilla.(Core MM).
>>
>> If I change in the vmscan.c as below patch, it will work.
>
> Sorry, but 4.14.65 does not have braces around trylock_page(),
> like in your patch below.
>
> See https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/mm/vmscan.c?h=v4.14.65
>
> [...]
>
>>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>>> index be56e2e..2e51edc 100644
>>> --- a/mm/vmscan.c
>>> +++ b/mm/vmscan.c
>>> @@ -990,15 +990,17 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>>> page = lru_to_page(page_list);
>>> list_del(&page->lru);
>>>
>>> if (!trylock_page(page)) {
>>> goto keep;
>>> }
>
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