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

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

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From: Benjamin Herrenschmidt

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

Date: Wednesday, June 18, 2008 - 5:39 pm

On Wed, 2008-06-18 at 17:24 -0700, Linus Torvalds wrote:
quoted text> 
> 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 ... 

Ben.


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Messages in current thread:

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

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

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

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

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

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Linus Torvalds, (Mon Jun 16, 10:29 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Hugh Dickins, (Mon Jun 16, 11:13 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Ingo Molnar, (Mon Jun 16, 11:49 am)

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

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

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Jeremy Fitzhardinge, (Wed Jun 18, 5:15 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Linus Torvalds, (Wed Jun 18, 5:24 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Jeremy Fitzhardinge, (Wed Jun 18, 5:37 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Benjamin Herrenschmidt, (Wed Jun 18, 5:39 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Linus Torvalds, (Wed Jun 18, 5:49 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Linus Torvalds, (Wed Jun 18, 9:03 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Jeremy Fitzhardinge, (Wed Jun 18, 10:03 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Benjamin Herrenschmidt, (Thu Jun 19, 12:20 am)

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

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Ingo Molnar, (Thu Jun 19, 5:03 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Akinobu Mita, (Thu Jun 19, 5:20 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Linus Torvalds, (Thu Jun 19, 9:30 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Ingo Molnar, (Thu Jun 19, 9:47 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Jeremy Fitzhardinge, (Thu Jun 19, 10:57 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Ingo Molnar, (Fri Jun 20, 3:10 am)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Jeremy Fitzhardinge, (Fri Jun 20, 12:06 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Linus Torvalds, (Fri Jun 20, 12:15 pm)

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Ingo Molnar, (Fri Jun 20, 12:56 pm)

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

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

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

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

Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ..., Ingo Molnar, (Fri Jun 20, 11:06 pm)

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