Re: vvar, gup && coredump

From: Pedro Alves
Date: Thu Mar 12 2015 - 14:20:14 EST

On 03/12/2015 05:46 PM, Oleg Nesterov wrote:
> On 03/12, Oleg Nesterov wrote:
>> Yes, this is true. OK, lets not dump it.
> OTOH. We can probably add ->access() into special_mapping_vmops, this
> way __access_remote_vm() could work even if gup() fails ?
> Jan, Sergio. How much do we want do dump this area ? The change above
> should be justified.

Memory mappings that weren't touched since they were initially mapped can
be retrieved from the program binary and the shared libraries, even if
the core dump is moved to another machine. However, in vvar case,
sounds like there's nowhere to read it from offline? In that case,
it could be justified to dump it.

Pedro Alves

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