linux-kernel - Re: [RFC PATCH 1/3] mm, memory_hotplug: try to migrate full section worth of pages

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Message-ID: <e7935648-104d-a0b8-f5ad-4460f2815b9b@redhat.com>
Date:   Tue, 20 Nov 2018 15:27:40 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <OSalvador@...e.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/3] mm, memory_hotplug: try to migrate full section
 worth of pages

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@...hat.com>
> 
> Thanks!
> 


-- 

Thanks,

David / dhildenb