From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Igor Druzhinin <igor.druzhinin@citrix.com>,
<xen-devel@lists.xenproject.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Cc: <paul.durrant@citrix.com>, <wei.liu2@citrix.com>, <davem@davemloft.net>
Subject: Re: [Xen-devel] [PATCH] xen-netback: fix occasional leak of grant ref mappings under memory pressure
Date: Thu, 28 Feb 2019 09:50:08 +0000 [thread overview]
Message-ID: <efd4aa90-e2f4-cd14-7890-6b47f3f94497@citrix.com> (raw)
In-Reply-To: <1551319382-32595-1-git-send-email-igor.druzhinin@citrix.com>
On 28/02/2019 02:03, Igor Druzhinin wrote:
> Zero-copy callback flag is not yet set on frag list skb at the moment
> xenvif_handle_frag_list() returns -ENOMEM. This eventually results in
> leaking grant ref mappings since xenvif_zerocopy_callback() is never
> called for these fragments. Those eventually build up and cause Xen
> to kill Dom0 as the slots get reused for new mappings.
Its worth pointing out what (debug) Xen notices is dom0 performing
implicit grant unmap.
~Andrew
prev parent reply other threads:[~2019-02-28 9:50 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-28 2:03 Igor Druzhinin
2019-02-28 9:46 ` Paul Durrant
2019-02-28 11:01 ` Wei Liu
2019-02-28 11:21 ` Paul Durrant
2019-02-28 11:43 ` Igor Druzhinin
2019-02-28 11:49 ` Paul Durrant
2019-02-28 12:07 ` Paul Durrant
2019-02-28 12:37 ` Wei Liu
2019-02-28 9:50 ` Andrew Cooper [this message]
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