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From: Alexei Starovoitov <ast@fb.com>
To: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>,
	Song Liu <songliubraving@fb.com>
Cc: <peterz@infradead.org>, <rostedt@goodmis.org>, <mingo@redhat.com>,
	<davem@davemloft.net>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <daniel@iogearbox.net>,
	<kernel-team@fb.com>, Oleg Nesterov <oleg@redhat.com>,
	"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Subject: Re: [PATCH v5 0/6] enable creating [k,u]probe with perf_event_open
Date: Mon, 9 Apr 2018 21:54:43 -0700
Message-ID: <33ee2501-14b8-5e89-d84f-e903b4cdd9e7@fb.com> (raw)
In-Reply-To: <97e2c641-9dfe-bf7c-9043-c79fa0c568f9@linux.vnet.ibm.com>

On 4/9/18 9:45 PM, Ravi Bangoria wrote:
> Hi Song,
>
> On 12/07/2017 04:15 AM, Song Liu wrote:
>> With current kernel, user space tools can only create/destroy [k,u]probes
>> with a text-based API (kprobe_events and uprobe_events in tracefs). This
>> approach relies on user space to clean up the [k,u]probe after using them.
>> However, this is not easy for user space to clean up properly.
>>
>> To solve this problem, we introduce a file descriptor based API.
>> Specifically, we extended perf_event_open to create [k,u]probe, and attach
>> this [k,u]probe to the file descriptor created by perf_event_open. These
>> [k,u]probe are associated with this file descriptor, so they are not
>> available in tracefs.
>
> Sorry for being late. One simple question..
>
> Will it be good to support k/uprobe arguments with perf_event_open()?
> Do you have any plans about that?

no plans for that. People that use text based interfaces should
probably be using text interfaces consistently.
imo mixing FD-based kprobe api with text is not worth the complexity.

      reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-06 22:45 Song Liu
2017-12-06 22:45 ` [PATCH v5] bcc: Try use new API to create " Song Liu
2017-12-06 22:45 ` [PATCH v5] perf_event_open.2: add type kprobe and uprobe Song Liu
2017-12-06 22:45 ` [PATCH v5 1/6] perf: prepare perf_event.h for new types perf_kprobe and perf_uprobe Song Liu
2018-02-06 11:52   ` [tip:perf/core] perf/core: Prepare perf_event.h for new types: 'perf_kprobe' and 'perf_uprobe' tip-bot for Song Liu
2017-12-06 22:45 ` [PATCH v5 2/6] perf: copy new perf_event.h to tools/include/uapi Song Liu
2018-02-06 11:52   ` [tip:perf/core] perf/headers: Sync new perf_event.h with the tools/include/uapi version tip-bot for Song Liu
2018-02-13 22:38     ` Alexei Starovoitov
2018-02-14  7:51       ` Ingo Molnar
2017-12-06 22:45 ` [PATCH v5 3/6] perf: implement pmu perf_kprobe Song Liu
2017-12-20 10:03   ` Peter Zijlstra
2017-12-20 10:14     ` Peter Zijlstra
2017-12-20 18:10       ` Song Liu
2017-12-20 21:25         ` Peter Zijlstra
2017-12-20 22:05           ` Song Liu
2018-02-06 11:59   ` [tip:perf/core] perf/core: Implement the 'perf_kprobe' PMU tip-bot for Song Liu
2017-12-06 22:45 ` [PATCH v5 4/6] perf: implement pmu perf_uprobe Song Liu
2018-02-06 11:59   ` [tip:perf/core] perf/core: Implement the 'perf_uprobe' PMU tip-bot for Song Liu
2017-12-06 22:45 ` [PATCH v5 5/6] bpf: add option for bpf_load.c to use perf_kprobe Song Liu
2017-12-06 22:45 ` [PATCH v5 6/6] bpf: add new test test_many_kprobe Song Liu
2017-12-07 10:23 ` [PATCH v5 0/6] enable creating [k,u]probe with perf_event_open Philippe Ombredanne
2017-12-08 19:57 ` Daniel Borkmann
2017-12-19 17:24   ` Song Liu
2017-12-19 20:25     ` Peter Zijlstra
2018-04-10  4:45 ` Ravi Bangoria
2018-04-10  4:54   ` Alexei Starovoitov [this message]

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