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Date:   Fri, 20 Nov 2020 01:33:33 +0000
From:   HORIGUCHI NAOYA(堀口 直也) 
To:     Oscar Salvador <>
CC:     "" <>,
        "" <>,
        "" <>,
        "" <>
Subject: Re: [PATCH 6/7] mm,hwpoison: Disable pcplists before grabbing a

On Thu, Nov 19, 2020 at 11:57:15AM +0100, Oscar Salvador wrote:
> Currently, we have a sort of retry mechanism to make sure pages in
> pcp-lists are spilled to the buddy system, so we can handle those.
> We can save us this extra checks with the new disable-pcplist mechanism
> that is available with [1].
> zone_pcplist_disable makes sure to 1) disable pcplists, so any page
> that is freed up from that point onwards will end up in the buddy
> system and 2) drain pcplists, so those pages that already in pcplists
> are spilled to buddy.
> With that, we can make a common entry point for grabbing a refcount
> from both soft_offline and memory_failure paths that is guarded by
> zone_pcplist_disable/zone_pcplist_enable.

This new mechanism provides a better solution to us.

> [1]
> Signed-off-by: Oscar Salvador <>

Thank you very much.

Acked-by: Naoya Horiguchi <>

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