From: Avi Kivity <avi@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
KVM list <kvm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Oleg Nesterov <oleg@redhat.com>
Subject: Re: qemu core dump and filtering guest pages
Date: Wed, 23 May 2012 11:37:42 +0300 [thread overview]
Message-ID: <4FBCA1D6.1070905@redhat.com> (raw)
In-Reply-To: <4FBBFFB5.3010605@de.ibm.com>
On 05/23/2012 12:05 AM, Christian Borntraeger wrote:
> Folks,
>
> today we discussed the situation of a qemu crash (with coredump) and big guests.
> Quite often the guest pages are not needed but make the core file pretty big.
>
> The most appealing proposal that we had was to adopt the core file code in the
> kernel to have an option for discarding guest pages (e.g. /proc/sys/core_guest).
> do_corefile would have a callback into the kvm module that could use its memory
> slot infrastructure to decide if this page should be saved or not.
>
> Would you consider such a change be ok? Any better idea?
There's MADV_DONTDUMP which can be used to control this on a per-guest
basis.
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2012-05-23 8:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 21:05 qemu core dump and filtering guest pages Christian Borntraeger
2012-05-23 8:37 ` Avi Kivity [this message]
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