From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anton Blanchard <anton@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org, mikey@neuling.org, paulus@samba.org
Subject: Re: [PATCH 3/3] powerpc: POWER7 optimised copy_to_user/copy_from_user using VMX
Date: Fri, 17 Jun 2011 15:58:20 +1000 [thread overview]
Message-ID: <1308290300.32158.48.camel@pasglop> (raw)
In-Reply-To: <20110617045421.700411944@samba.org>
On Fri, 2011-06-17 at 14:54 +1000, Anton Blanchard wrote:
> plain text document attachment (power7_copy_tofrom_user)
> Implement a POWER7 optimised copy_to_user/copy_from_user using VMX.
> For large aligned copies this new loop is over 10% faster, and for
> large unaligned copies it is over 200% faster.
>
> If we take a fault we fall back to the old version, this keeps
> things relatively simple and easy to verify.
Same re-entrancy comment as the other ones. preempt & interrupts...
Except here is worse since you may page fault and thus lose the vmx
state completely.
Cheers,
Ben.
prev parent reply other threads:[~2011-06-17 5:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-17 4:53 [PATCH 0/3] POWER7 optimised copy loops Anton Blanchard
2011-06-17 4:53 ` [PATCH 1/3] powerpc: POWER7 optimised copy_page using VMX Anton Blanchard
2011-06-17 5:16 ` Michael Neuling
2011-06-17 5:26 ` Anton Blanchard
2011-06-17 5:43 ` Benjamin Herrenschmidt
2011-06-17 5:53 ` Benjamin Herrenschmidt
2011-06-17 20:26 ` Segher Boessenkool
2011-06-17 4:54 ` [PATCH 2/3] powerpc: POWER7 optimised memcpy " Anton Blanchard
2011-06-17 5:57 ` Benjamin Herrenschmidt
2011-06-17 7:12 ` Gabriel Paubert
2011-06-17 9:02 ` David Laight
2011-06-17 4:54 ` [PATCH 3/3] powerpc: POWER7 optimised copy_to_user/copy_from_user " Anton Blanchard
2011-06-17 5:58 ` Benjamin Herrenschmidt [this message]
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