From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Oscar Salvador <OSalvador@suse.com>,
Pavel Tatashin <pasha.tatashin@oracle.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 1/3] mm, memory_hotplug: try to migrate full section worth of pages
Date: Tue, 20 Nov 2018 15:27:40 +0100 [thread overview]
Message-ID: <e7935648-104d-a0b8-f5ad-4460f2815b9b@redhat.com> (raw)
In-Reply-To: <20181120142517.GL22247@dhcp22.suse.cz>
On 20.11.18 15:25, Michal Hocko wrote:
> On Tue 20-11-18 15:18:41, David Hildenbrand wrote:
> [...]
>> (we could also check for pending signals inside that function if really
>> required)
>
> do_migrate_pages is not the proper layer to check signals. Because the
> loop only isolates pages and that is not expensive. The most expensive
> part is deeper down in the migration core. We wait for page lock or
> writeback and that can take a long. None of that is killable wait which
> is a larger surgery but something that we should consider should there
> be any need to address this.
Indeed, that makes sense.
>
>> Reviewed-by: David Hildenbrand <david@redhat.com>
>
> Thanks!
>
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2018-11-20 14:27 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-20 13:43 [RFC PATCH 0/3] few memory offlining enhancements Michal Hocko
2018-11-20 13:43 ` [RFC PATCH 1/3] mm, memory_hotplug: try to migrate full section worth of pages Michal Hocko
2018-11-20 14:18 ` David Hildenbrand
2018-11-20 14:25 ` Michal Hocko
2018-11-20 14:27 ` David Hildenbrand [this message]
2018-11-20 14:33 ` Pavel Tatashin
2018-11-20 14:51 ` osalvador
2018-11-20 15:00 ` Michal Hocko
2018-11-20 13:43 ` [RFC PATCH 2/3] mm, memory_hotplug: deobfuscate migration part of offlining Michal Hocko
2018-11-20 14:26 ` David Hildenbrand
2018-11-20 14:34 ` Michal Hocko
2018-11-20 14:34 ` David Hildenbrand
2018-11-20 15:13 ` osalvador
2018-11-20 15:18 ` Michal Hocko
2018-11-20 13:43 ` [RFC PATCH 3/3] mm, fault_around: do not take a reference to a locked page Michal Hocko
2018-11-20 14:07 ` Kirill A. Shutemov
2018-11-20 14:12 ` Michal Hocko
2018-11-20 14:17 ` Kirill A. Shutemov
2018-11-20 14:25 ` Michal Hocko
2018-11-21 4:51 ` William Kucharski
2018-11-21 7:07 ` Michal Hocko
2018-11-20 14:33 ` David Hildenbrand
2018-11-21 1:47 ` Hugh Dickins
2018-11-21 7:11 ` Michal Hocko
2018-11-22 2:27 ` Hugh Dickins
2018-11-22 9:05 ` Michal Hocko
2018-11-23 20:22 ` Hugh Dickins
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