linux-kernel - Re: qemu core dump and filtering guest pages

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Message-ID: <4FBCA1D6.1070905@redhat.com>
Date:	Wed, 23 May 2012 11:37:42 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: qemu core dump and filtering guest pages

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
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