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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
View File

@@ -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);
}

10
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
View File

@@ -202,8 +202,8 @@ static void update_cpu_closid_rmid(void *info)
struct rdtgroup *r = info;
if (r) {
this_cpu_write(rdt_cpu_default.closid, r->closid);
this_cpu_write(rdt_cpu_default.rmid, r->mon.rmid);
this_cpu_write(pqr_state.default_closid, r->closid);
this_cpu_write(pqr_state.default_rmid, r->mon.rmid);
}
/*
@@ -1733,7 +1733,7 @@ static int rdtgroup_rmdir_mon(struct kernfs_node *kn, struct rdtgroup *rdtgrp,
/* Update per cpu rmid of the moved CPUs first */
for_each_cpu(cpu, &rdtgrp->cpu_mask)
per_cpu(rdt_cpu_default.rmid, cpu) = prdtgrp->mon.rmid;
per_cpu(pqr_state.default_rmid, cpu) = prdtgrp->mon.rmid;
/*
* Update the MSR on moved CPUs and CPUs which have moved
* task running on them.
@@ -1774,8 +1774,8 @@ static int rdtgroup_rmdir_ctrl(struct kernfs_node *kn, struct rdtgroup *rdtgrp,
/* Update per cpu closid and rmid of the moved CPUs first */
for_each_cpu(cpu, &rdtgrp->cpu_mask) {
per_cpu(rdt_cpu_default.closid, cpu) = rdtgroup_default.closid;
per_cpu(rdt_cpu_default.rmid, cpu) = rdtgroup_default.mon.rmid;
per_cpu(pqr_state.default_closid, cpu) = rdtgroup_default.closid;
per_cpu(pqr_state.default_rmid, cpu) = rdtgroup_default.mon.rmid;
}
/*