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From: Johannes Berg on 22 Jul 2010 07:30
On Thu, 2010-07-22 at 19:18 +0800, Lin Ming wrote:
> mac80211 tracepoint events are exported like below,
>
> /sys/class/ieee80211/events/
> |-- api_beacon_loss
> | |-- config
> | |-- type
> ....
> ....
> |-- drv_add_interface
> | |-- config
> | |-- type
> ....
> ....
> |-- stop_queue
> | |-- config
> | |-- type
> |-- wake_queue
> | |-- config
> | |-- type
> ---
> drivers/base/class.c | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/base/class.c b/drivers/base/class.c
> index 8e231d0..57ada53 100644
> --- a/drivers/base/class.c
> +++ b/drivers/base/class.c
> @@ -19,6 +19,7 @@
> #include <linux/slab.h>
> #include <linux/genhd.h>
> #include <linux/mutex.h>
> +#include <linux/perf_event.h>
> #include "base.h"
>
> #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
> @@ -160,6 +161,14 @@ static void klist_class_dev_put(struct klist_node *n)
> put_device(dev);
> }
>
> +extern struct class ieee80211_class;
> +
> +static void class_sys_add_tp(struct kobject *class_kobj, struct class *cls)
> +{
> + if (cls == &ieee80211_class)
> + perf_sys_add_tp(class_kobj, "mac80211");
> +}
> +

Ick, what a bad hack! No way. And this really can't work anyway when
cfg80211 is a module. This is all messed up. The events should probably
be in /sys/class/ieee80211/phyX/ anyway.

johannes

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