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authorFenghua Yu <fenghua.yu@intel.com>2016-11-12 02:02:38 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-11-15 18:35:50 +0100
commitf410770293a1fbc08906474c24104a7a11943eb6 (patch)
treedb1ec8f60afcbf6a603bc21b4ceeae47c25194b0 /Documentation/pnp.txt
parentx86/intel_rdt: Reset per cpu closids on unmount (diff)
downloadlinux-f410770293a1fbc08906474c24104a7a11943eb6.tar.xz
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x86/intel_rdt: Update percpu closid immeditately on CPUs affected by changee
If CPUs are moved to or removed from a rdtgroup, the percpu closid storage is updated. If tasks running on an affected CPU use the percpu closid then the PQR_ASSOC MSR is only updated when the task runs through a context switch. Up to the context switch the CPUs operate on the wrong closid. This state is potentially unbound. Make the change immediately effective by invoking a smp function call on the affected CPUs which stores the new closid in the perpu storage and calls the rdt_sched_in() function which updates the MSR, if the current task uses the percpu closid. [ tglx: Made it work and massaged changelog once more ] Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com> Cc: "Tony Luck" <tony.luck@intel.com> Cc: "Sai Prakhya" <sai.praneeth.prakhya@intel.com> Cc: "Vikas Shivappa" <vikas.shivappa@linux.intel.com> Cc: "Ingo Molnar" <mingo@elte.hu> Cc: "H. Peter Anvin" <h.peter.anvin@intel.com> Link: http://lkml.kernel.org/r/1478912558-55514-3-git-send-email-fenghua.yu@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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