From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: Balloon pressuring page cache
Date: Mon, 3 Feb 2020 12:03:56 -0500
Message-ID: <20200203120225-mutt-send-email-mst@kernel.org>
References: <CAJuQAmpDUyve2S+oxp9tLUhuRcnddXnNztC5PmYOOCpY6c68xg@mail.gmail.com>
 <91270a68-ff48-88b0-219c-69801f0c252f@redhat.com>
 <CAJuQAmoaK0Swytu2Os_SQRfG5_LqiCPaDa9yatatm9MtfncNTQ@mail.gmail.com>
 <75d4594f-0864-5172-a0f8-f97affedb366@redhat.com>
 <286AC319A985734F985F78AFA26841F73E3F8A02@shsmsx102.ccr.corp.intel.com>
 <CAJuQAmqcayaNuG19fKCuux=YVO3+VcN-qrXvobgKMykogeMkzA@mail.gmail.com>
 <20200203080520-mutt-send-email-mst@kernel.org>
 <5ac131de8e3b7fc1fafd05a61feb5f6889aeb917.camel@linux.intel.com>
 <c836a8d1-c5cc-eb8b-84ed-027070b77bf8@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <virtualization-bounces@lists.linux-foundation.org>
In-Reply-To: <c836a8d1-c5cc-eb8b-84ed-027070b77bf8@redhat.com>
Content-Disposition: inline
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/virtualization>,
 <mailto:virtualization-request@lists.linux-foundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/virtualization/>
List-Post: <mailto:virtualization@lists.linux-foundation.org>
List-Help: <mailto:virtualization-request@lists.linux-foundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/virtualization>,
 <mailto:virtualization-request@lists.linux-foundation.org?subject=subscribe>
Errors-To: virtualization-bounces@lists.linux-foundation.org
Sender: "Virtualization" <virtualization-bounces@lists.linux-foundation.org>
To: David Hildenbrand <david@redhat.com>
Cc: "virtualization@lists.linux-foundation.org" <virtualization@lists.linux-foundation.org>, Tyler Sanderson <tysand@google.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, David Rientjes <rientjes@google.com>, Alexander Duyck <alexander.h.duyck@linux.intel.com>, Michal Hocko <mhocko@kernel.org>
List-Id: virtualization@lists.linuxfoundation.org
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