Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() whenrunning on bare metal
From: Josh Boyer
Date: Thu Feb 28 2013 - 19:06:13 EST
On Fri, Mar 01, 2013 at 12:37:20AM +0100, Borislav Petkov wrote:
> On Thu, Feb 28, 2013 at 05:55:49PM -0500, Boris Ostrovsky wrote:
> > Invoking arch_flush_lazy_mmu_mode() results in calls to
> > preempt_enable()/disable() which may have performance impact.
> > Since lazy MMU is not used on bare metal we can patch away
> > arch_flush_lazy_mmu_mode() so that it is never called in such
> > environment.
> > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Looks straight-forward enough to me.
> Acked-by: Borislav Petkov <bp@xxxxxxx>
I'll try to get someone to test this tomorrow.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/