Re: MPS codegen

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Re: MPS codegen

From: Gerd Möllmann

Subject: Re: MPS codegen

Date: 2024年6月15日 11:27:43 +0200

Good idea!
Sent from my iPhone
> On 15. Jun 2024, at 11:07, Helmut Eller <eller.helmut@gmail.com> wrote:
>
> On Sat, Jun 15 2024, Gerd Möllmann wrote:
>
>> Helmut Eller <eller.helmut@gmail.com> writes:
>> 
>>>> On Sat, Jun 15 2024, Gerd Möllmann wrote:
>>> 
>>>> I can't munmap because that
>>>> would write back the changes done by the reloc phase back to the .pdmp
>>>> file.
>>> 
>>> I think that's a misunderstanding. dump_map_file_posix sets MAP_PRIVATE
>>> for DUMP_MEMORY_ACCESS_READWRITE. So whatever changes the reloc phase
>>> makes, they are written to copy-on-write pages and never to disk.
>> 
>> Hm, I can try that a bit later. So, the theory would be that mprotect
>> PROT_NONE does not work somehow on madvice'd not needed memory? 
>
> It looks like dump_discard_mem doesn't properly check error codes.
> Maybe the region it want's to discard is not at page boundaries or
> something like that.

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