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x86/intel_rdt/mbm: Add mbm counter initialization

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MBM counters are monotonically increasing counts representing the total
memory bytes at a particular time. In order to calculate total_bytes for
an rdtgroup, we store the value of the counter when we create an
rdtgroup or when a new domain comes online.

When the total_bytes(all memory controller bytes) or local_bytes(local
memory controller bytes) file in "mon_data" is read it shows the
total bytes for that rdtgroup since its creation. User can snapshot this
at different time intervals to obtain bytes/second.

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: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Cc: reinette.chatre@intel.com
Link: http://lkml.kernel.org/r/1501017287-28083-28-git-send-email-vikas.shivappa@linux.intel.com
This commit is contained in:
Vikas Shivappa
2017-07-25 14:14:46 -07:00
committed by Thomas Gleixner
parent 9f52425ba3
commit a4de1dfdd7
4 changed files with 23 additions and 2 deletions
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5
arch/x86/kernel/cpu/intel_rdt_ctrlmondata.c
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@@ -287,7 +287,7 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
}
void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
struct rdtgroup *rdtgrp, int evtid)
struct rdtgroup *rdtgrp, int evtid, int first)
{
/*
* setup the parameters to send to the IPI to read the data.
@@ -296,6 +296,7 @@ void mon_event_read(struct rmid_read *rr, struct rdt_domain *d,
rr->evtid = evtid;
rr->d = d;
rr->val = 0;
rr->first = first;
smp_call_function_any(&d->cpu_mask, mon_event_count, rr, 1);
}
@@ -325,7 +326,7 @@ int rdtgroup_mondata_show(struct seq_file *m, void *arg)
goto out;
}
mon_event_read(&rr, d, rdtgrp, evtid);
mon_event_read(&rr, d, rdtgrp, evtid, false);
if (rr.val & RMID_VAL_ERROR)
seq_puts(m, "Error\n");