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x86/intel_rdt: Modify the intel_pqr_state for better performance

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Currently we have pqr_state and rdt_default_state which store the cached
CLOSID/RMIDs and the user configured cpu default values respectively. We
touch both of these during context switch. Put all of them in one
structure so that we can spare a cache line.

Reported-by: Thomas Gleixner <tglx@linutronix.de>
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: peterz@infradead.org
Cc: eranian@google.com
Cc: sai.praneeth.prakhya@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Link: http://lkml.kernel.org/r/1502304395-7166-3-git-send-email-vikas.shivappa@linux.intel.com
This commit is contained in:
Vikas Shivappa
2017-08-09 11:46:34 -07:00
committed by Thomas Gleixner
parent eda61c265f
commit a9110b552d
3 changed files with 26 additions and 24 deletions
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10
arch/x86/kernel/cpu/intel_rdt.c
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@@ -47,8 +47,6 @@ DEFINE_MUTEX(rdtgroup_mutex);
*/
DEFINE_PER_CPU(struct intel_pqr_state, pqr_state);
DEFINE_PER_CPU_READ_MOSTLY(struct intel_pqr_state, rdt_cpu_default);
/*
* Used to store the max resource name width and max resource data width
* to display the schemata in a tabular format
@@ -550,10 +548,10 @@ static void clear_closid_rmid(int cpu)
{
struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
per_cpu(rdt_cpu_default.closid, cpu) = 0;
per_cpu(rdt_cpu_default.rmid, cpu) = 0;
state->closid = 0;
state->rmid = 0;
state->default_closid = 0;
state->default_rmid = 0;
state->cur_closid = 0;
state->cur_rmid = 0;
wrmsr(IA32_PQR_ASSOC, 0, 0);
}