From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
To: linuxppc-dev list <Linuxppc-dev@ozlabs.org>
Cc: linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [RFC:PATCH 00/06] Strong Access Ordering page attributes for POWER7
Date: Tue, 10 Jun 2008 18:00:55 -0400 [thread overview]
Message-ID: <20080610220055.10257.84465.sendpatchset@norville.austin.ibm.com> (raw)
Allow an application to enable Strong Access Ordering on specific pages of
memory on Power 7 hardware. Currently, power has a weaker memory model than
x86. Implementing a stronger memory model allows an emulator to more
efficiently translate x86 code into power code, resulting in faster code
execution.
On Power 7 hardware, storing 0b1110 in the WIMG bits of the hpte enables
strong access ordering mode for the memory page. This patchset allows a
user to specify which pages are thus enabled by passing a new protection
bit through mmap() and mprotect(). I have tentatively defined this bit,
PROT_SAO, as 0x10.
In order to accomplish this, I had to modify the architecture-independent
code to allow the architecture to deal with additional protection bits.
Patches built against 2.6.26-rc5.
Any and all suggestions, complaints, flames, insults, etc. are appreciated.
Thanks,
Shaggy
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next reply other threads:[~2008-06-10 22:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-10 22:00 Dave Kleikamp [this message]
2008-06-10 22:01 ` [RFC:PATCH 01/06] powerpc: hash_huge_page() should get the WIMG bits from the lpte Dave Kleikamp
2008-06-10 22:01 ` [RFC:PATCH 02/06] mm: Allow architectures to define additional protection bits Dave Kleikamp
2008-06-10 22:14 ` Andrew Morton
2008-06-11 15:47 ` Dave Kleikamp
2008-06-10 22:01 ` [RFC:PATCH 03/06] powerpc: Define flags for Strong Access Ordering Dave Kleikamp
2008-06-10 22:01 ` [RFC:PATCH 04/06] powerpc: Define CPU_FTR_SAO Dave Kleikamp
2008-06-10 22:01 ` [RFC:PATCH 05/06] powerpc: Add Strong Access Ordering Dave Kleikamp
2008-06-10 22:01 ` [RFC:PATCH 06/06] powerpc: Don't clear _PAGE_COHERENT when _PAGE_SAO is set Dave Kleikamp
2008-06-10 22:26 ` Sergei Shtylyov
2008-06-11 3:12 ` Dave Kleikamp
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