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From: Vlastimil Babka <vbabka@suse.cz>
To: Oscar Salvador <osalvador@suse.de>, akpm@linux-foundation.org
Cc: n-horiguchi@ah.jp.nec.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 7/7] mm,hwpoison: Remove drain_all_pages from shake_page
Date: Thu, 26 Nov 2020 14:52:32 +0100	[thread overview]
Message-ID: <4033449e-eb86-e306-81af-d4c6dc823bdf@suse.cz> (raw)
In-Reply-To: <20201119105716.5962-8-osalvador@suse.de>

On 11/19/20 11:57 AM, Oscar Salvador wrote:
> get_hwpoison_page already drains pcplists, previously disabling
> them when trying to grab a refcount.
> We do not need shake_page to take care of it anymore.
> 
> Signed-off-by: Oscar Salvador <osalvador@suse.de>
> ---
>   mm/memory-failure.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 512613e9a1bd..ad976e1c3178 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -263,8 +263,8 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
>   }
>   
>   /*
> - * When a unknown page type is encountered drain as many buffers as possible
> - * in the hope to turn the page into a LRU or free page, which we can handle.
> + * Unknown page type encountered. Try to check whether it can turn PageLRU by
> + * lru_add_drain_all, or a free page by reclaiming slabs when possible.
>    */
>   void shake_page(struct page *p, int access)
>   {
> @@ -275,9 +275,6 @@ void shake_page(struct page *p, int access)
>   		lru_add_drain_all();
>   		if (PageLRU(p))
>   			return;
> -		drain_all_pages(page_zone(p));
> -		if (PageLRU(p) || is_free_buddy_page(p))
> -			return;

I wonder if page in the lru pagevec can in fact become free after draining the 
lru - in that case we could keep the is_free_buddy_page() check.

>   	}
>   
>   	/*
> 


  parent reply	other threads:[~2020-11-26 13:52 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 10:57 [PATCH 0/7] HWPoison: Refactor get page interface Oscar Salvador
2020-11-19 10:57 ` [PATCH 1/7] mm,hwpoison: Refactor get_any_page Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-25 16:54   ` Vlastimil Babka
2020-11-19 10:57 ` [PATCH 2/7] mm,hwpoison: Drop pfn parameter Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-25 16:55   ` Vlastimil Babka
2020-11-19 10:57 ` [PATCH 3/7] mm,madvise: call soft_offline_page() without MF_COUNT_INCREASED Oscar Salvador
2020-11-25 18:20   ` Vlastimil Babka
2020-12-01 11:35     ` Oscar Salvador
2020-12-04 17:25       ` Vlastimil Babka
2020-12-05 15:34         ` Oscar Salvador
2020-12-07  2:34           ` HORIGUCHI NAOYA(堀口 直也)
2020-12-07  7:24             ` Oscar Salvador
2020-11-19 10:57 ` [PATCH 4/7] mm,hwpoison: remove MF_COUNT_INCREASED Oscar Salvador
2020-11-19 10:57 ` [PATCH 5/7] mm,hwpoison: remove flag argument from soft offline functions Oscar Salvador
2020-11-19 10:57 ` [PATCH 6/7] mm,hwpoison: Disable pcplists before grabbing a refcount Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-26 13:45   ` Vlastimil Babka
2020-11-28  0:51     ` Andrew Morton
2020-11-19 10:57 ` [PATCH 7/7] mm,hwpoison: Remove drain_all_pages from shake_page Oscar Salvador
2020-11-20  1:33   ` HORIGUCHI NAOYA(堀口 直也)
2020-11-26 13:52   ` Vlastimil Babka [this message]
2020-11-27  7:20     ` Oscar Salvador
2020-12-02 13:34 ` [PATCH 0/7] HWPoison: Refactor get page interface Qian Cai
2020-12-02 13:41   ` Oscar Salvador

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