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

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From: Jeremy Fitzhardinge
Subject: Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction
Date: Wednesday, June 18, 2008 - 4:59 pm

Benjamin Herrenschmidt wrote:

Good point, I'd overlooked that.  I guess that means using it in 
ptep_set_wrprotect().

At present the x86 ptep_set_wrprotect() just uses clear_bit on the pte, 
which is a locked cycle.  Is that significantly cheaper than an xchg + 
set?  (Same number of locked operations...)

    J
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[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)