From mboxrd@z Thu Jan  1 00:00:00 1970
From: Song Liu <songliubraving@fb.com>
Subject: Re: [PATCH v5 3/6] perf: implement pmu perf_kprobe
Date: Wed, 20 Dec 2017 18:10:11 +0000
Message-ID: <F626E159-8271-4D3A-9DF0-9FC4E6AF0964@fb.com>
References: <20171206224518.3598254-1-songliubraving@fb.com>
 <20171206224518.3598254-6-songliubraving@fb.com>
 <20171220100301.bvacqfua4hj2onzq@hirez.programming.kicks-ass.net>
 <20171220101426.cquh5uv4bgj4bk7y@hirez.programming.kicks-ass.net>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
Cc: Steven Rostedt <rostedt@goodmis.org>,
        "mingo@redhat.com" <mingo@redhat.com>,
        David Miller <davem@davemloft.net>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Daniel Borkmann" <daniel@iogearbox.net>,
        Kernel Team <Kernel-team@fb.com>
To: Peter Zijlstra <peterz@infradead.org>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20171220101426.cquh5uv4bgj4bk7y@hirez.programming.kicks-ass.net>
Content-Language: en-US
Content-ID: <E31C6EC51CB677408E3A8BF2D8231C63@namprd15.prod.outlook.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org


> On Dec 20, 2017, at 2:14 AM, Peter Zijlstra <peterz@infradead.org> wrote:
>=20
> 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_even=
t *event, void __user *arg)
>>> 	char *filter_str;
>>> 	int ret =3D -EINVAL;
>>>=20
>>> -	if ((event->attr.type !=3D PERF_TYPE_TRACEPOINT ||
>>> +	if ((!perf_event_is_tracing(event) ||
>>> 	     !IS_ENABLED(CONFIG_EVENT_TRACING)) &&
>>> 	    !has_addr_filter(event))
>>> 		return -EINVAL;
>>=20
>> You actually missed an instance later in this same function... fixing
>> that.
>=20
>=20
> @@ -8518,23 +8601,19 @@ perf_event_set_addr_filter(struct perf_e
>=20
> static int perf_event_set_filter(struct perf_event *event, void __user *a=
rg)
> {
> -	char *filter_str;
> 	int ret =3D -EINVAL;
> -
> -	if ((event->attr.type !=3D PERF_TYPE_TRACEPOINT ||
> -	    !IS_ENABLED(CONFIG_EVENT_TRACING)) &&
> -	    !has_addr_filter(event))
> -		return -EINVAL;
> +	char *filter_str;
>=20
> 	filter_str =3D strndup_user(arg, PAGE_SIZE);
> 	if (IS_ERR(filter_str))
> 		return PTR_ERR(filter_str);
>=20
> -	if (IS_ENABLED(CONFIG_EVENT_TRACING) &&
> -	    event->attr.type =3D=3D PERF_TYPE_TRACEPOINT)
> -		ret =3D 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 =3D ftrace_profile_set_filter(event, event->attr.config, filter_st=
r);
> +	else
> +#endif
> +	if (has_addr_filter(event))
> 		ret =3D perf_event_set_addr_filter(event, filter_str);
>=20
> 	kfree(filter_str);
>=20
>=20
>=20
> Is that right?

Yeah, this is right and neat. Thanks a lot for your help on this.=20

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 !=3D PERF_TYPE_TRACEPOINT) {
+       if (!perf_event_is_tracing(event)) {
                perf_event_free_bpf_handler(event);
                return;
        }

Thanks,
Song=