lkml.org 
[lkml]   [2008]   [Jun]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction
Benjamin Herrenschmidt wrote:
>> Which architecture are you interested in? If it isn't x86, you can
>> probably get anything past Linus ;)
>>
>> I'll do some measurements to see what effect the batchable
>> ptep_set_wrprotect() has on native. If it's significant, I'll propose
>> making it conditional on CONFIG_PARAVIRT.
>>
>
> Oh, I mostly think about powerpc, I just wondered if I could re-use
> your new stuff in that context. Mostly idle thoughts at this stage, I
> haven't looked seriously.
>

There are general-purpose hooks in the common code which architectures
can implement however they like. In x86-land we hook them up to pvops,
but you can handle them however you want.

> I have an old patch set to batch forks (and mprotect etc...) TLB
> invalidations (which is what I really want to batch on powerpc, more
> than the actual PTE changes) that involves subtle changes to the
> batching mechanisms etc...
>

Do you mean setting up batches of per-page tlb shootdowns rather than
going a global tlb flush at the end?

J


\
 
 \ /
  Last update: 2008-06-19 20:01    [W:0.163 / U:1.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site