Messages in this thread | | | Date | Thu, 11 Apr 2013 11:17:12 -0400 | From | Boris Ostrovsky <> | Subject | Re: [tip:x86/urgent] x86, mm: Patch out arch_flush_lazy_mmu_mode() when running on bare metal |
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On 04/10/2013 08:30 PM, tip-bot for Boris Ostrovsky wrote: > Commit-ID: 511ba86e1d386f671084b5d0e6f110bb30b8eeb2 > Gitweb: http://git.kernel.org/tip/511ba86e1d386f671084b5d0e6f110bb30b8eeb2 > Author: Boris Ostrovsky <boris.ostrovsky@oracle.com> > AuthorDate: Sat, 23 Mar 2013 09:36:36 -0400 > Committer: H. Peter Anvin <hpa@linux.intel.com> > CommitDate: Wed, 10 Apr 2013 11:25:10 -0700 > > x86, mm: Patch out arch_flush_lazy_mmu_mode() when running on bare metal > > 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. > > [ hpa: the previous patch "Fix vmalloc_fault oops during lazy MMU > updates" may cause a minor performance regression on > bare metal. This patch resolves that performance regression. It is > somewhat unclear to me if this is a good -stable candidate. ]
I think this
https://lkml.org/lkml/2013/2/26/420
was also part of lazy mmu set of patches but is missing in the latest batch of commits.
-boris
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