From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv2 2/8] perf probe: Improve detection of file/function name in the probe pattern
Date: Thu, 12 Mar 2015 17:24:14 -0300 [thread overview]
Message-ID: <20150312202414.GD3550@kernel.org> (raw)
In-Reply-To: <d60cf320bc3d51ca8980e48bc31044cacba8a920.1418654436.git.naveen.n.rao@linux.vnet.ibm.com>
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?
- Arnaldo
> 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;
> + if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
> + /* This is a file spec if it includes a '.' before ; or : */
> + if (memchr(arg, '.', ptr-arg))
> + c = 1;
> + }
> +
> ptr = strpbrk(arg, ";:+@%");
> if (ptr) {
> nc = *ptr;
> @@ -1009,10 +1027,9 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
> if (tmp == NULL)
> return -ENOMEM;
>
> - /* Check arg is function or file and copy it */
> - if (strchr(tmp, '.')) /* File */
> + if (c == 1)
> pp->file = tmp;
> - else /* Function */
> + else
> pp->function = tmp;
>
> /* Parse other options */
> --
> 2.1.3
next prev parent reply other threads:[~2015-03-12 20:24 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 [this message]
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
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=20150312202414.GD3550@kernel.org \
--to=acme@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=masami.hiramatsu.pt@hitachi.com \
--cc=naveen.n.rao@linux.vnet.ibm.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).