linux-kernel - Re: [PATCH v35 1/5] mm: support to get hints of free page blocks

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Message-ID: <20180712131229.GM32648@dhcp22.suse.cz>
Date:   Thu, 12 Jul 2018 15:12:29 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     wei.w.wang@...el.com, virtio-dev@...ts.oasis-open.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        virtualization <virtualization@...ts.linux-foundation.org>,
        KVM list <kvm@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        liliang.opensource@...il.com, yang.zhang.wz@...il.com,
        quan.xu0@...il.com, nilal@...hat.com,
        Rik van Riel <riel@...hat.com>, peterx@...hat.com
Subject: Re: [PATCH v35 1/5] mm: support to get hints of free page blocks

[Hmm this one somehow got stuck in my outgoing emails]

On Wed 11-07-18 09:23:54, Linus Torvalds wrote:
[...]
> So I'm open to new interfaces. I just want those new interfaces to
> make sense, and be low latency and simple for the VM to do. I'm
> objecting to the incredibly baroque and heavy-weight one that can
> return near-infinite amounts of memory.

Mel was suggesting a bulk page allocator a year ago [1]. I can see only
slab bulk api so I am not sure what happened with that work. Anyway
I think that starting with what we have right now is much more
appropriate than over design this thing from the early beginning.

[1] http://lkml.kernel.org/r/20170109163518.6001-5-mgorman@techsingularity.net
-- 
Michal Hocko
SUSE Labs