Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

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Cc: Linus Torvalds <torvalds@...>, xen-devel <xen-devel@...>, Peter Zijlstra <a.p.zijlstra@...>, kvm-devel <kvm-devel@...>, <x86@...>, LKML <linux-kernel@...>, Virtualization Mailing List <virtualization@...>, Hugh Dickins <hugh@...>, Ingo Molnar <mingo@...>, Thomas Gleixner <tglx@...>

Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

Date: Thursday, June 19, 2008 - 1:03 am

Benjamin Herrenschmidt wrote:
quoted text> On Wed, 2008-06-18 at 17:24 -0700, Linus Torvalds wrote:
>   
>> On Wed, 18 Jun 2008, Jeremy Fitzhardinge wrote:
>>     
>>> Along the lines of:
>>>       
>> Hell no. There's a reason we have a special set_wrprotect() thing. We can 
>> do it more efficiently on native hardware by just clearing the bit 
>> atomically. No need to do the cmpxchg games.
>>     
>
> But we can't batch ... 
>   

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.

    J
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Messages in current thread:

[PATCH 0 of 4] mm+paravirt+xen: add pte read-modify-write ab..., Jeremy Fitzhardinge, (Mon Jun 16, 7:29 am)

[PATCH 2 of 4] paravirt: add hooks for ptep_modify_prot_star..., Jeremy Fitzhardinge, (Mon Jun 16, 7:30 am)

[PATCH 4 of 4] xen: add mechanism to extend existing multica..., Jeremy Fitzhardinge, (Mon Jun 16, 7:30 am)

[PATCH 3 of 4] xen: implement ptep_modify_prot_start/commit, Jeremy Fitzhardinge, (Mon Jun 16, 7:30 am)

[PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstra..., Jeremy Fitzhardinge, (Mon Jun 16, 7:30 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Benjamin Herrenschmidt, (Wed Jun 18, 7:23 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Wed Jun 18, 7:59 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Wed Jun 18, 8:15 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Wed Jun 18, 8:24 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Benjamin Herrenschmidt, (Wed Jun 18, 8:39 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Thu Jun 19, 1:03 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Benjamin Herrenschmidt, (Thu Jun 19, 3:20 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Thu Jun 19, 1:57 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Wed Jun 18, 8:37 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Wed Jun 18, 8:49 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Thu Jun 19, 12:03 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Thu Jun 19, 7:58 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Thu Jun 19, 12:30 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Thu Jun 19, 12:47 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Fri Jun 20, 6:10 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Fri Jun 20, 3:06 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Fri Jun 20, 3:15 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Fri Jun 20, 3:56 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Fri Jun 20, 4:05 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Fri Jun 20, 4:03 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Fri Jun 20, 4:16 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Jeremy Fitzhardinge, (Fri Jun 20, 4:22 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Sat Jun 21, 2:06 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Akinobu Mita, (Thu Jun 19, 8:20 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Thu Jun 19, 8:03 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Linus Torvalds, (Mon Jun 16, 1:29 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Hugh Dickins, (Mon Jun 16, 2:13 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab..., Ingo Molnar, (Mon Jun 16, 2:49 pm)

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