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Date: Tue, 3 Jul 2012 11:40:35 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: [PATCH 1/4] xen/p2m: Optimize the get_phys_to_machine function a bit. Running perf tells me that the check for p2m_identity is done a lot - more than it should. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> --- arch/x86/xen/p2m.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 64effdc..161bcdc 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -406,7 +406,7 @@ unsigned long get_phys_to_machine(unsigned long pfn) * and in p2m_*missing, so returning the INVALID_P2M_ENTRY * would be wrong. */ - if (p2m_top[topidx][mididx] == p2m_identity) + if (unlikely(p2m_top[topidx][mididx] == p2m_identity)) return IDENTITY_FRAME(pfn); return p2m_top[topidx][mididx][idx]; -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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