[External] Re: [PATCH v3 00/19] arm64 kernel text replication

[Hao Jia]

On 2024/1/17 Russell King (Oracle) wrote:
> On Wed, Jan 17, 2024 at 04:53:38PM +0800, Hao Jia wrote:
>> Many thanks to Russell King for his previous work on
>> arm64 kernel text replication.
>> https://lore.kernel.org/all/ZMKNYEkM7YnrDtOt@shell.armlinux.org.uk
>>
>> After applying these patches, we tested that our business performance
>> increased by more than 5% and the NUMA node memory bandwidth was more
>> balanced.
>> I've recently been trying to make it work with different numbers of
>> page tables/page sizes, so updated this patch set to V3.
>>
>> Patch overview:
>>
>> Patch 1-16 is a patch set based on Russell King's previous arm64
>> kernel text replication, rebased on commit 052d534373b7.
>>
>> The following three patches are new in v3:
>> patch 17 fixes compilation warning
>>
>> patch 18 adapts arm64 kernel text replication to support more
>> page tables/page sizes, in addition to 16K page size and
>> 4-level page tables.
>>
>> patch 19 fixes the abnormal startup problem caused by module_alloc()
>> which may allocate an address larger than KIMAGE_VADDR when kernel text
>> replication is enabled.
>>
>> [v2] https://lore.kernel.org/all/ZMKNYEkM7YnrDtOt@shell.armlinux.org.uk
>> [RFC] https://lore.kernel.org/all/ZHYCUVa8fzmB4XZV@shell.armlinux.org.uk
>>
>> Please correct me if I've made a mistake, thank you very much!
> 
> Note that, even though I haven't posted an update (I see it as mostly
> pointless because *noone* commented on the previous posting) I do
> maintain these patches:
> 
>    git://git.armlinux.org.uk/~rmk/linux-arm.git aarch64/ktext/head
> 
> currently has them against v6.7
> 

Thanks for sharing the information.
Would you mind reviewing patch 18 and patch 19?

patch 18 attempts to adapt arm64 kernel text replication to support more 
page tables/page sizes
patch 19 fixes the problem of abnormal startup when kernel text 
replication is enabled

Maybe you have a better idea to support more page tables/page sizes, any 
suggestions would make sense to me.


Thanks,
Hao