diff options
| author | Vikas Shivappa <vikas.shivappa@linux.intel.com> | 2017-07-25 14:14:46 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2017-08-01 22:41:29 +0200 |
| commit | a4de1dfdd726537e2a78b55759fc646d9b0a0be8 (patch) | |
| tree | 7b3e16e16417ada6e732bf59c8098b1f434e12bd /arch/x86/kernel/cpu/intel_rdt_monitor.c | |
| parent | 9f52425ba303d91c8370719e91d7e578bfdf309f (diff) | |
x86/intel_rdt/mbm: Add mbm counter initialization
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
Diffstat (limited to 'arch/x86/kernel/cpu/intel_rdt_monitor.c')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_rdt_monitor.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/intel_rdt_monitor.c b/arch/x86/kernel/cpu/intel_rdt_monitor.c index ef0358b59102..383a023fca35 100644 --- a/arch/x86/kernel/cpu/intel_rdt_monitor.c +++ b/arch/x86/kernel/cpu/intel_rdt_monitor.c @@ -321,6 +321,13 @@ static int __mon_event_count(u32 rmid, struct rmid_read *rr) */ return -EINVAL; } + + if (rr->first) { + m->prev_msr = tval; + m->chunks = 0; + return 0; + } + shift = 64 - MBM_CNTR_WIDTH; chunks = (tval << shift) - (m->prev_msr << shift); chunks >>= shift; |