From: Michal Hocko <mhocko@suse.com>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Oscar Salvador <osalvador@suse.de>,
"Michael S. Tsirkin" <mst@redhat.com>,
David Hildenbrand <david@redhat.com>,
Vlastimil Babka <vbabka@suse.cz>,
Alexander Duyck <alexander.h.duyck@linux.intel.com>,
Minchan Kim <minchan@kernel.org>
Subject: Re: [PATCH] mm/memory_hotplug: Make unpopulated zones PCP structures unreachable during hot remove
Date: Sat, 10 Apr 2021 09:25:52 +0200 [thread overview]
Message-ID: <YHFS5OXrbyN68KSO@dhcp22.suse.cz> (raw)
In-Reply-To: <20210409151259.GP3697@techsingularity.net>
On Fri 09-04-21 16:12:59, Mel Gorman wrote:
[...]
> If anything, the minimal "fix" is to simply delete IRQ disable/enable on
> the grounds that IRQs protect nothing and assume the existing hotplug
> paths guarantees the PCP cannot be used after zone_pcp_enable(). That
> should be the case already because all the pages have been freed and
> there is nothing to even put into the PCPs but I worried that the PCP
> structure itself might still be reachable even if it's useless which is
> why I freed the structure once they could not be reached via zonelists.
OK. Let's do that for now and I will put a follow up on my todo list.
Thanks!
--
Michal Hocko
SUSE Labs
prev parent reply other threads:[~2021-04-10 7:26 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-09 12:09 [PATCH] mm/memory_hotplug: Make unpopulated zones PCP structures unreachable during hot remove Mel Gorman
2021-04-09 12:42 ` Michal Hocko
2021-04-09 12:48 ` Michal Hocko
2021-04-09 13:42 ` Mel Gorman
2021-04-09 14:37 ` Michal Hocko
2021-04-09 15:12 ` Mel Gorman
2021-04-09 19:05 ` David Hildenbrand
2021-04-10 7:25 ` Michal Hocko [this message]
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