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x86/intel_rdt/mba_sc: Prepare for feedback loop

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This is a preparatory patch for the mba feedback loop. Add support to
measure the "bandwidth in MBps" and the "delta bandwidth". Measure it by
reading the MBM IA32_QM_CTR MSRs and calculating the amount of "bytes"
moved. There is no user space interface for this and will only be used by
the feedback loop patch.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/1524263781-14267-6-git-send-email-vikas.shivappa@linux.intel.com
This commit is contained in:
Vikas Shivappa
2018-04-20 15:36:20 -07:00
committed by Thomas Gleixner
parent 8205a078ba
commit ba0f26d852
2 changed files with 48 additions and 6 deletions
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10
arch/x86/kernel/cpu/intel_rdt.h
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@@ -180,10 +180,20 @@ struct rftype {
* struct mbm_state - status for each MBM counter in each domain
* @chunks: Total data moved (multiply by rdt_group.mon_scale to get bytes)
* @prev_msr Value of IA32_QM_CTR for this RMID last time we read it
* @chunks_bw Total local data moved. Used for bandwidth calculation
* @prev_bw_msr:Value of previous IA32_QM_CTR for bandwidth counting
* @prev_bw The most recent bandwidth in MBps
* @delta_bw Difference between the current and previous bandwidth
* @delta_comp Indicates whether to compute the delta_bw
*/
struct mbm_state {
u64 chunks;
u64 prev_msr;
u64 chunks_bw;
u64 prev_bw_msr;
u32 prev_bw;
u32 delta_bw;
bool delta_comp;
};
/**