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

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Message-ID: <20180711223040-mutt-send-email-mst@kernel.org>
Date:   Wed, 11 Jul 2018 22:36:50 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Wei Wang <wei.w.wang@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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>,
        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

On Wed, Jul 11, 2018 at 01:09:49PM +0200, Michal Hocko wrote:
> But let me note that I am not really convinced how this (or previous)
> approach will really work in most workloads. We tend to cache heavily so
> there is rarely any memory free.

It might be that it's worth flushing the cache when VM is
migrating. Or maybe we should implement virtio-tmem or add
transcendent memory support to the balloon.

-- 
MST