From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@kernel.org>
Subject: Re: [PATCHv2 2/8] perf probe: Improve detection of file/function name in the probe pattern
Date: Mon, 27 Apr 2015 10:35:17 +0530 [thread overview]
Message-ID: <20150427050517.GA6113@naverao1-tp.in.ibm.com> (raw)
In-Reply-To: <5502C7EF.8080007@hitachi.com>
On 2015/03/13 08:20PM, Masami Hiramatsu wrote:
> (2015/03/13 5:24), Arnaldo Carvalho de Melo wrote:
> > Em Mon, Dec 15, 2014 at 08:20:32PM +0530, Naveen N. Rao escreveu:
> >> Currently, perf probe considers patterns including a '.' to be a file.
> >> However, this causes problems on powerpc ABIv1 where all functions have
> >> a leading '.':
> >>
> >> $ perf probe -F | grep schedule_timeout_interruptible
> >> .schedule_timeout_interruptible
> >> $ perf probe .schedule_timeout_interruptible
> >> Semantic error :File always requires line number or lazy pattern.
> >> Error: Command Parse Error.
> >>
> >> Fix this by checking the probe pattern in more detail.
> >
> > Masami, can I have your Acked-by or Reviewed-by?
>
> As far as I can see, this is not enough for fixing that issue.
> Could you fold the first half of [4/8] to this patch?
Sure.
> I also have some comments on it. See below.
>
> >
> >> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
> >> ---
> >> tools/perf/util/probe-event.c | 23 ++++++++++++++++++++---
> >> 1 file changed, 20 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> >> index 28eb141..9943ff3 100644
> >> --- a/tools/perf/util/probe-event.c
> >> +++ b/tools/perf/util/probe-event.c
> >> @@ -999,6 +999,24 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
> >> arg = tmp;
> >> }
> >>
> >> + /*
> >> + * Check arg is function or file name and copy it.
> >> + *
> >> + * We consider arg to be a file spec if and only if it satisfies
> >> + * all of the below criteria::
> >> + * - it does not include any of "+@%",
> >> + * - it includes one of ":;", and
> >> + * - it has a period '.' in the name.
> >> + *
> >> + * Otherwise, we consider arg to be a function specification.
> >> + */
> >> + c = 0;
>
> Oh please, don't reuse 'char c' for a boolean flag, you should
> introduce new 'bool file_loc' etc.
>
> >> + if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
> >> + /* This is a file spec if it includes a '.' before ; or : */
> >> + if (memchr(arg, '.', ptr-arg))
> ^^ add spaces around '-'.
Sure.
- Naveen
next prev parent reply other threads:[~2015-04-27 5:05 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-15 14:50 [PATCHv2 0/8] Fix perf probe issues on powerpc Naveen N. Rao
2014-12-15 14:50 ` [PATCHv2 1/8] kprobes: Fix kallsyms lookup across powerpc ABIv1 and ABIv2 Naveen N. Rao
2014-12-15 14:50 ` [PATCHv2 2/8] perf probe: Improve detection of file/function name in the probe pattern Naveen N. Rao
2015-03-12 20:24 ` Arnaldo Carvalho de Melo
2015-03-12 20:25 ` Arnaldo Carvalho de Melo
2015-03-13 2:03 ` Ananth N Mavinakayanahalli
2015-03-13 11:20 ` Masami Hiramatsu
2015-04-27 5:05 ` Naveen N. Rao [this message]
2015-04-27 5:09 ` Naveen N. Rao
2014-12-15 14:50 ` [PATCHv2 3/8] perf probe powerpc: Fix symbol fixup issues due to ELF type Naveen N. Rao
2015-03-12 20:23 ` Arnaldo Carvalho de Melo
2015-04-27 5:06 ` Naveen N. Rao
2014-12-15 14:50 ` [PATCHv2 4/8] perf probe powerpc: Handle powerpc dot symbols Naveen N. Rao
2015-03-12 20:26 ` Arnaldo Carvalho de Melo
2014-12-15 14:50 ` [PATCHv2 5/8] perf probe powerpc: Allow matching against " Naveen N. Rao
2015-03-12 20:30 ` Arnaldo Carvalho de Melo
2015-04-27 5:08 ` Naveen N. Rao
2014-12-15 14:50 ` [PATCHv2 6/8] perf tools powerpc: Fix PPC64 ELF ABIv2 symbol decoding Naveen N. Rao
2015-03-12 20:35 ` Arnaldo Carvalho de Melo
2014-12-15 14:50 ` [PATCHv2 7/8] perf probe powerpc: Use DWARF info only if necessary Naveen N. Rao
2014-12-15 14:50 ` [PATCHv2 8/8] perf probe powerpc: Fixup function entry if using kallsyms lookup Naveen N. Rao
2015-03-12 20:37 ` Arnaldo Carvalho de Melo
2015-01-28 5:42 ` [PATCHv2 0/8] Fix perf probe issues on powerpc Naveen N. Rao
2015-01-28 6:14 ` Michael Ellerman
2015-01-28 6:43 ` Naveen N. Rao
2015-01-30 2:19 ` Michael Ellerman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20150427050517.GA6113@naverao1-tp.in.ibm.com \
--to=naveen.n.rao@linux.vnet.ibm.com \
--cc=acme@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=masami.hiramatsu.pt@hitachi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).