linux-kernel - Re: On guest free page hinting and OOM

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Message-ID: <20190402154732-mutt-send-email-mst@kernel.org>
Date:   Tue, 2 Apr 2019 15:49:00 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     Alexander Duyck <alexander.duyck@...il.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Paolo Bonzini <pbonzini@...hat.com>, lcapitulino@...hat.com,
        pagupta@...hat.com, Yang Zhang <yang.zhang.wz@...il.com>,
        Rik van Riel <riel@...riel.com>, dodgen@...gle.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        dhildenb@...hat.com, Andrea Arcangeli <aarcange@...hat.com>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: On guest free page hinting and OOM

On Tue, Apr 02, 2019 at 08:21:30PM +0200, David Hildenbrand wrote:
> The other extreme is a system that barely frees (MAX_ORDER - X) pages,
> however your thread will waste cycles scanning for such.

I don't think we need to scan as such. An arch hook
that queues a job to a wq only when there's work to
do will fix the issue, right?

-- 
MST