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

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Message-ID: <20190402134722-mutt-send-email-mst@kernel.org>
Date:   Tue, 2 Apr 2019 13:53:12 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     David Hildenbrand <david@...hat.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 10:45:43AM -0700, Alexander Duyck wrote:
> We went through this back in the day with
> networking. Adding more buffers is not the solution. The solution is
> to have a way to gracefully recover and keep our hinting latency and
> buffer bloat to a minimum.

That's an interesting approach, I think that things that end up working
well are NAPI (asychronous notifications), limited batching, XDP (big
aligned buffers) and BQL (accounting). Is that your perspective too?

-- 
MST