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?
Thanks
Christian
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.
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