linux-kernel - Re: [1/5] powerpc/mm: only call store_updates_sp() on stores in do_page

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Date:   Mon,  5 Jun 2017 20:21:48 +1000 (AEST)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <oss@...error.net>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [1/5] powerpc/mm: only call store_updates_sp() on stores in do_page_fault()

On Wed, 2017-04-19 at 12:56:24 UTC, Christophe Leroy wrote:
> Function store_updates_sp() checks whether the faulting
> instruction is a store updating r1. Therefore we can limit its calls
> to stores exceptions.
> 
> This patch is an improvement of commit a7a9dcd882a67 ("powerpc: Avoid
> taking a data miss on every userspace instruction miss")
> 
> With the same microbenchmark app, run with 500 as argument, on an
> MPC885 we get:
> 
> Before this patch: 152000 DTLB misses
> After this patch:  147000 DTLB misses
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Patches 1, 3, 4 and 5 applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/e8de85ca32f572f5dee00733022d8a

cheers