Messages in this thread Patch in this message |  | | From | "Gautham R. Shenoy" <> | Subject | [PATCH 2/3] powerpc/sysfs: Show idle_purr and idle_spurr for every CPU | Date | Wed, 27 Nov 2019 17:31:11 +0530 |
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From: "Gautham R. Shenoy" <ego@linux.vnet.ibm.com>
On Pseries LPARs, to calculate utilization, we need to know the [S]PURR ticks when the CPUs were busy or idle.
The total PURR and SPURR ticks are already exposed via the per-cpu sysfs files /sys/devices/system/cpu/cpuX/purr and /sys/devices/system/cpu/cpuX/spurr.
This patch adds support for exposing the idle PURR and SPURR ticks via /sys/devices/system/cpu/cpuX/idle_purr and /sys/devices/system/cpu/cpuX/idle_spurr.
Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> --- arch/powerpc/kernel/sysfs.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 80a676d..42ade55 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -1044,6 +1044,36 @@ static ssize_t show_physical_id(struct device *dev, } static DEVICE_ATTR(physical_id, 0444, show_physical_id, NULL); +static ssize_t idle_purr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + unsigned int cpuid = cpu->dev.id; + struct lppaca *cpu_lppaca_ptr = paca_ptrs[cpuid]->lppaca_ptr; + u64 idle_purr_cycles = be64_to_cpu(cpu_lppaca_ptr->wait_state_cycles); + + return sprintf(buf, "%llx\n", idle_purr_cycles); +} +static DEVICE_ATTR_RO(idle_purr); + +DECLARE_PER_CPU(u64, idle_spurr_cycles); +static ssize_t idle_spurr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + unsigned int cpuid = cpu->dev.id; + u64 *idle_spurr_cycles_ptr = per_cpu_ptr(&idle_spurr_cycles, cpuid); + + return sprintf(buf, "%llx\n", *idle_spurr_cycles_ptr); +} +static DEVICE_ATTR_RO(idle_spurr); + +static void create_idle_purr_spurr_sysfs_entry(struct device *cpudev) +{ + device_create_file(cpudev, &dev_attr_idle_purr); + device_create_file(cpudev, &dev_attr_idle_spurr); +} + static int __init topology_init(void) { int cpu, r; @@ -1067,6 +1097,8 @@ static int __init topology_init(void) register_cpu(c, cpu); device_create_file(&c->dev, &dev_attr_physical_id); + if (firmware_has_feature(FW_FEATURE_SPLPAR)) + create_idle_purr_spurr_sysfs_entry(&c->dev); } } r = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/topology:online", -- 1.9.4
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