Messages in this thread Patch in this message | | | Subject | [RFC][PATCH 3/9] perf: export registerred pmus via sysfs | From | Lin Ming <> | Date | Mon, 10 May 2010 17:27:03 +0800 |
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Export pmus via sysfs /sys/devices/system/cpu/pmus/0...N The file name is the pmu id, ie, /sys/devices/system/cpu/pmus/N represents pmu id N. So perf tool can use it to initialize perf_event_attr.
Signed-off-by: Lin Ming <ming.m.lin@intel.com> --- kernel/perf_event.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index f19d40e..003b632 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -5744,6 +5744,52 @@ static int __init perf_event_sysfs_init(void) } device_initcall(perf_event_sysfs_init); +#define PMU_ID_LEN 5 +static int __init perf_pmu_sysfs_init(void) +{ + struct kobject *pmu_kobj; + struct pmu *pmu; + struct bin_attribute *bin_attr; + char *pmu_id; + int err; + int i = 0; + + pmu_kobj = kobject_create_and_add("pmus", &cpu_sysdev_class.kset.kobj); + if (!pmu_kobj) { + printk(KERN_WARNING "%s: kset create error\n", __func__); + return -ENOMEM; + } + + list_for_each_entry(pmu, &pmus, entry) { + bin_attr = kzalloc(sizeof(*bin_attr), GFP_KERNEL); + pmu_id = kzalloc(PMU_ID_LEN, GFP_KERNEL); + + if (!bin_attr || !pmu_id) { + if (bin_attr) + kfree(bin_attr); + if (pmu_id) + kfree(pmu_id); + return -ENOMEM; + } + + sysfs_attr_init(&bin_attr.attr); + sprintf(pmu_id, "%d\n", i++); + bin_attr->size = 0; + bin_attr->attr.name = pmu_id; + bin_attr->attr.mode = 0444; + + err = sysfs_create_bin_file(pmu_kobj, bin_attr); + if (err) { + kfree(bin_attr); + kfree(pmu_id); + return -ENOMEM; + } + } + + return 0; +} +device_initcall(perf_pmu_sysfs_init); + void perf_event_register_pmu(struct pmu *pmu) { pmu->id = pmu_id_curr++;
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