From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Song Liu <songliubraving@fb.com>
Cc: open list <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
Kernel Team <Kernel-team@fb.com>
Subject: Re: [PATCH v7 3/3] perf-stat: enable counting events for BPF programs
Date: Tue, 19 Jan 2021 11:31:43 -0300 [thread overview]
Message-ID: <20210119143143.GJ12699@kernel.org> (raw)
In-Reply-To: <379919CC-594F-40C5-A10E-97E048F73AE2@fb.com>
Em Tue, Jan 19, 2021 at 12:48:19AM +0000, Song Liu escreveu:
> > On Jan 18, 2021, at 11:38 AM, Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> We are looking at two issues:
> 1. Cannot recursively attach;
> 2. prog FD 3 doesn't have valid btf.
> #1 was caused by the verifier disallowing attaching fentry/fexit program
> to program with type BPF_PROG_TYPE_TRACING (in bpf_check_attach_target).
> This constraint was added when we only had fentry/fexit in the TRACING
> type. We have extended the TRACING type to many other use cases, like
> "tp_btf/", "fmod_ret" and "iter/". Therefore, it is good time to revisit
> this constraint. I will work on this.
> For #2, we require the target program to have BTF. I guess we won't remove
> this requirement.
> While I work on improving #1, could you please test with some kprobe
> programs? For example, we can use fileslower.py from bcc.
Sure, and please consider improving the error messages to state what you
described above.
- Arnaldo
next prev parent reply other threads:[~2021-01-19 22:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 21:42 [PATCH v7 0/3] Introduce perf-stat -b for BPF programs Song Liu
2020-12-29 21:42 ` [PATCH v7 1/3] bpftool: add Makefile target bootstrap Song Liu
2020-12-29 21:42 ` [PATCH v7 2/3] perf: support build BPF skeletons with perf Song Liu
2020-12-29 21:42 ` [PATCH v7 3/3] perf-stat: enable counting events for BPF programs Song Liu
2021-01-12 7:35 ` Namhyung Kim
2021-01-15 18:53 ` Arnaldo Carvalho de Melo
2021-01-18 19:38 ` Arnaldo Carvalho de Melo
2021-01-19 0:48 ` Song Liu
2021-01-19 14:31 ` Arnaldo Carvalho de Melo [this message]
2021-01-19 14:42 ` Arnaldo Carvalho de Melo
2021-01-19 16:31 ` Arnaldo Carvalho de Melo
2021-01-19 21:54 ` Song Liu
2021-01-19 22:30 ` Arnaldo Carvalho de Melo
2021-01-20 12:37 ` Arnaldo Carvalho de Melo
2021-01-20 13:01 ` Arnaldo Carvalho de Melo
2021-01-20 13:50 ` Arnaldo Carvalho de Melo
2021-01-20 16:30 ` FIX " Arnaldo Carvalho de Melo
2021-01-20 16:40 ` Song Liu
2021-01-20 17:04 ` Arnaldo Carvalho de Melo
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