Re: [PATCH] x86: Add clflush before monitor for Intel 7400 series - v2

[Ingo Molnar <mingo@elte.hu>]

* Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> wrote:

> For Intel 7400 series CPUs, the recommendation is to use a clflush on the 
> monitored address just before monitor and mwait pair [1]. This clflush makes sure 
> that there are no false wakeups from mwait when the monitored address was recently 
> written to.
> 
> [1] "MONITOR/MWAIT Recommendations for Intel Xeon Processor 7400 series"
> section in specification update document of 7400 series
> http://download.intel.com/design/xeon/specupdt/32033601.pdf
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
> 
> ---
> 
> Earlier patch:
> http://marc.info/?l=linux-kernel&m=122341330606025&w=2
> 
> Current changes:
> Minor modification based on Peter's comment
> 
>  arch/x86/include/asm/cpufeature.h |    1 +
>  arch/x86/kernel/cpu/intel.c       |    3 +++
>  arch/x86/kernel/process.c         |    6 ++++++
>  3 files changed, 10 insertions(+)

applied to tip/x86/urgent, thanks Venki!

	Ingo