Pavel Tatashin writes:
>> > I understand that having an extra set of page tables could potentially
>> > waste memory, especially if VAs are sparse, but in this case we use
>> > page tables exclusively for contiguous VA space (copy [src, src +
>> > size]). Therefore, the extra memory usage is
> > I understand that having an extra set of page tables could potentially
> > waste memory, especially if VAs are sparse, but in this case we use
> > page tables exclusively for contiguous VA space (copy [src, src +
> > size]). Therefore, the extra memory usage is tiny. The ratio for
> > kernels
Pavel Tatashin writes:
> Hi James,
>
>> The problem I see with this is rewriting the relocation code. It needs to
>> work whether the
>> machine has enough memory to enable the MMU during kexec, or not.
>>
>> In off-list mail to Pavel I proposed an alternative implementation here:
>>
Hi James,
> The problem I see with this is rewriting the relocation code. It needs to
> work whether the
> machine has enough memory to enable the MMU during kexec, or not.
>
> In off-list mail to Pavel I proposed an alternative implementation here:
>
Hi Pavel,
On 27/01/2021 17:27, Pavel Tatashin wrote:
> Enable MMU during kexec relocation in order to improve reboot performance.
>
> If kexec functionality is used for a fast system update, with a minimal
> downtime, the relocation of kernel + initramfs takes a significant portion
> of reboot.
Changelog:
v11:
- Fixed missing KEXEC_CORE dependency for trans_pgd.c
- Removed useless "if(rc) return rc" statement (thank you Tyler Hicks)
- Another 12 patches were accepted into maintainer's get.
Re-based patches against:
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