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

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From: Benjamin Herrenschmidt <benh@...>
To: Jeremy Fitzhardinge <jeremy@...>
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 - 3:20 am

> Which architecture are you interested in?  If it isn't x86, you can 

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.

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... but it has issues and would need to be
reworked before merging.

It's something that's been in the back of my mind or the bottom of my
TODO list for some time, but I never quite found the bandwidth to go
back to it.

Cheers,
Ben.

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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)