Re: [PATCH v5 3/6] perf: implement pmu perf_kprobe

[Song Liu]

> On Dec 20, 2017, at 2:14 AM, Peter Zijlstra <pet...@infradead.org> wrote:
> 
> On Wed, Dec 20, 2017 at 11:03:01AM +0100, Peter Zijlstra wrote:
>> On Wed, Dec 06, 2017 at 02:45:15PM -0800, Song Liu wrote:
>>> @@ -8537,7 +8620,7 @@ static int perf_event_set_filter(struct perf_event 
>>> *event, void __user *arg)
>>>     char *filter_str;
>>>     int ret = -EINVAL;
>>> 
>>> -   if ((event->attr.type != PERF_TYPE_TRACEPOINT ||
>>> +   if ((!perf_event_is_tracing(event) ||
>>>          !IS_ENABLED(CONFIG_EVENT_TRACING)) &&
>>>         !has_addr_filter(event))
>>>             return -EINVAL;
>> 
>> You actually missed an instance later in this same function... fixing
>> that.
> 
> 
> @@ -8518,23 +8601,19 @@ perf_event_set_addr_filter(struct perf_e
> 
> static int perf_event_set_filter(struct perf_event *event, void __user *arg)
> {
> -     char *filter_str;
>       int ret = -EINVAL;
> -
> -     if ((event->attr.type != PERF_TYPE_TRACEPOINT ||
> -         !IS_ENABLED(CONFIG_EVENT_TRACING)) &&
> -         !has_addr_filter(event))
> -             return -EINVAL;
> +     char *filter_str;
> 
>       filter_str = strndup_user(arg, PAGE_SIZE);
>       if (IS_ERR(filter_str))
>               return PTR_ERR(filter_str);
> 
> -     if (IS_ENABLED(CONFIG_EVENT_TRACING) &&
> -         event->attr.type == PERF_TYPE_TRACEPOINT)
> -             ret = ftrace_profile_set_filter(event, event->attr.config,
> -                                             filter_str);
> -     else if (has_addr_filter(event))
> +#ifdef CONFIG_EVENT_TRACING
> +     if (perf_event_is_tracing(event))
> +             ret = ftrace_profile_set_filter(event, event->attr.config, 
> filter_str);
> +     else
> +#endif
> +     if (has_addr_filter(event))
>               ret = perf_event_set_addr_filter(event, filter_str);
> 
>       kfree(filter_str);
> 
> 
> 
> Is that right?

Yeah, this is right and neat. Thanks a lot for your help on this. 

I think there is one more thing to change:

diff --git i/kernel/events/core.c w/kernel/events/core.c
index a906f30..516ff9b 100644
--- i/kernel/events/core.c
+++ w/kernel/events/core.c
@@ -8226,7 +8226,7 @@ static int perf_event_set_bpf_prog(struct perf_event 
*event, u32 prog_fd)

 static void perf_event_free_bpf_prog(struct perf_event *event)
 {
-       if (event->attr.type != PERF_TYPE_TRACEPOINT) {
+       if (!perf_event_is_tracing(event)) {
                perf_event_free_bpf_handler(event);
                return;
        }

Thanks,
Song