From: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Marcelo Ricardo Leitner <mleitner@redhat.com>
Subject: Re: [PATCH 02/35] perf probe: Clarify error message about not finding kernel modules debuginfo
Date: Thu, 7 Mar 2019 20:58:23 -0300 [thread overview]
Message-ID: <20190307235823.GD32240@kernel.org> (raw)
In-Reply-To: <20190308083033.cd4aceb08983875d07cabc1a@kernel.org>
Em Fri, Mar 08, 2019 at 08:30:33AM +0900, Masami Hiramatsu escreveu:
> On Thu, 7 Mar 2019 14:44:00 -0300
> Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
>
> > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> >
> > 'perf probe' supports using just the kernel module name, but that will
> > work only when the module is loaded, or using the full pathname to the
> > file with the DWARF debug info, but the warning was cryptic:
>
> Agreed, this looks good to me.
>
> Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Thanks for checking!
- Arnaldo
> Thank you!
>
> >
> > Before:
> >
> > # perf probe -m cls_flower -L fl_change
> > Failed to find the path for cls_flower: No such file or directory
> > Error: Failed to show lines.
> > #
> >
> > After:
> >
> > # perf probe -m cls_flower -L fl_change
> > Module cls_flower is not loaded, please specify its full path name.
> > Error: Failed to show lines.
> > # perf probe -m /lib/modules/5.0.0-rc7+/kernel/net/sched/cls_flower.ko -L fl_change | head -7
> > <fl_change@/home/acme/git/linux/net/sched/cls_flower.c:0>
> > 0 static int fl_change(struct net *net, struct sk_buff *in_skb,
> > struct tcf_proto *tp, unsigned long base,
> > u32 handle, struct nlattr **tca,
> > void **arg, bool ovr, struct netlink_ext_ack *extack)
> > 4 {
> > 5 struct cls_fl_head *head = rtnl_dereference(tp->root);
> > #
> >
> > The behaviour doesn't change when the module is loaded:
> >
> > # modprobe cls_flower
> > # perf probe -m cls_flower -L fl_change | head -7
> > <fl_change@/home/acme/git/linux/net/sched/cls_flower.c:0>
> > 0 static int fl_change(struct net *net, struct sk_buff *in_skb,
> > struct tcf_proto *tp, unsigned long base,
> > u32 handle, struct nlattr **tca,
> > void **arg, bool ovr, struct netlink_ext_ack *extack)
> > 4 {
> > 5 struct cls_fl_head *head = rtnl_dereference(tp->root);
> > #
> >
> > Cc: Adrian Hunter <adrian.hunter@intel.com>
> > Cc: Jiri Olsa <jolsa@kernel.org>
> > Cc: Marcelo Ricardo Leitner <mleitner@redhat.com>
> > Cc: Masami Hiramatsu <mhiramat@kernel.org>
> > Cc: Namhyung Kim <namhyung@kernel.org>
> > Link: https://lkml.kernel.org/n/tip-q4njvk9mshra00jacqjbzfn5@git.kernel.org
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> > ---
> > tools/perf/util/probe-event.c | 9 ++++++---
> > 1 file changed, 6 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> > index 0030f9b9bf7e..a1b8d9649ca7 100644
> > --- a/tools/perf/util/probe-event.c
> > +++ b/tools/perf/util/probe-event.c
> > @@ -472,9 +472,12 @@ static struct debuginfo *open_debuginfo(const char *module, struct nsinfo *nsi,
> > strcpy(reason, "(unknown)");
> > } else
> > dso__strerror_load(dso, reason, STRERR_BUFSIZE);
> > - if (!silent)
> > - pr_err("Failed to find the path for %s: %s\n",
> > - module ?: "kernel", reason);
> > + if (!silent) {
> > + if (module)
> > + pr_err("Module %s is not loaded, please specify its full path name.\n", module);
> > + else
> > + pr_err("Failed to find the path for the kernel: %s\n", reason);
> > + }
> > return NULL;
> > }
> > path = dso->long_name;
> > --
> > 2.20.1
> >
>
>
> --
> Masami Hiramatsu <mhiramat@kernel.org>
--
- Arnaldo
next prev parent reply other threads:[~2019-03-07 23:58 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 17:43 [GIT PULL 00/35] perf/core improvements and fixes Arnaldo Carvalho de Melo
2019-03-07 17:43 ` [PATCH 01/35] perf, bpf: Consider events with attr.bpf_event as side-band events Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 02/35] perf probe: Clarify error message about not finding kernel modules debuginfo Arnaldo Carvalho de Melo
2019-03-07 23:30 ` Masami Hiramatsu
2019-03-07 23:58 ` Arnaldo Carvalho de Melo [this message]
2019-03-07 17:44 ` [PATCH 03/35] tools lib traceevent: Fix buffer overflow in arg_eval Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 04/35] perf: Mark expected switch fall-through Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 05/35] perf time-utils: Refactor time range parsing code Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 06/35] perf auxtrace: Improve address filter error message when there is no DSO Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 07/35] perf intel-pt: Fix divide by zero when TSC is not available Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 08/35] perf db-export: Add calls parent_id to enable creation of call trees Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 09/35] perf scripts python: export-to-sqlite.py: Export calls parent_id Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 10/35] perf scripts python: export-to-postgresql.py: Fix invalid input syntax for integer error Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 11/35] perf scripts python: export-to-postgresql.py: Export calls parent_id Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 12/35] perf scripts python: exported-sql-viewer.py: Factor out TreeWindowBase Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 13/35] perf scripts python: exported-sql-viewer.py: Improve TreeModel abstraction Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 14/35] perf scripts python: exported-sql-viewer.py: Factor out CallGraphModelBase Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 15/35] perf scripts python: exported-sql-viewer.py: Add call tree Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 16/35] perf beauty msg_flags: Add missing %s lost when adding prefix suppression logic Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 17/35] perf bpf: Automatically add BTF ELF markers Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 18/35] perf clang: Remove needless extra semicolon Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 19/35] perf annotate: Calculate the max instruction name, align column to that Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 20/35] perf thread: Generalize function to copy from thread addr space from intel-bts code Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 21/35] perf diff: Support --time filter option Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 22/35] perf diff: Support --cpu " Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 23/35] perf diff: Support --pid/--tid filter options Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 24/35] perf script python: Remove mixed indentation Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 25/35] perf script python: Add Python3 support to futex-contention.py Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 26/35] perf script python: add Python3 support to check-perf-trace.py Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 27/35] perf script python: Add Python3 support to event_analyzing_sample.py Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 28/35] perf script python: Add Python3 support to intel-pt-events.py Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 29/35] perf c2c: Fix c2c report for empty numa node Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 30/35] perf hist: Add error path into hist_entry__init Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 31/35] perf hist: Fix memory leak of srcline Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 32/35] perf tools: Read and store caps/max_precise in perf_pmu Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 33/35] perf evsel: Probe for precise_ip with simple attr Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 34/35] perf session: Fix double free in perf_data__close Arnaldo Carvalho de Melo
2019-03-07 17:44 ` [PATCH 35/35] perf data: Force perf_data__open|close zero data->file.path Arnaldo Carvalho de Melo
2019-03-09 16:02 ` [GIT PULL 00/35] perf/core improvements and fixes Ingo Molnar
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