linux-kernel - Re: [PATCH v2 resend] mm/memory_hotplug: Make unpopulated zones PCP structures unreachable during hot remove

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Message-ID: <YHVvfv8PtRcRgOcl@dhcp22.suse.cz>
Date:   Tue, 13 Apr 2021 12:16:30 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Alexander Duyck <alexanderduyck@...com>,
        Minchan Kim <minchan@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 resend] mm/memory_hotplug: Make unpopulated zones PCP
 structures unreachable during hot remove

On Tue 13-04-21 11:36:08, Vlastimil Babka wrote:
[...]
> AFAIK even Oscar's work on using the node to self-contain its own structures is
> only applicable to struct pages, not percpu allocations?

Correct. Teaching pcp storage on movable zone sounds like a large
undertaking to me. Not sure this is worth it TBH. Even an idea of any
pcp access synchronization with memory hotplug makes for a decent headache.

-- 
Michal Hocko
SUSE Labs