From: Masami Hiramatsu <mhiramat@kernel.org>
To: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Cc: acme@redhat.com, linux-kernel@vger.kernel.org,
alexis.berlemont@gmail.com, peterz@infradead.org,
mingo@redhat.com, alexander.shishkin@linux.intel.com,
mpe@ellerman.id.au, naveen.n.rao@linux.vnet.ibm.com,
maddy@linux.vnet.ibm.com
Subject: Re: [PATCH v2] perf/probe: Change MAX_CMDLEN
Date: Tue, 21 Mar 2017 14:19:50 +0900 [thread overview]
Message-ID: <20170321141950.3dbd5ba41f660450ea9e0d71@kernel.org> (raw)
In-Reply-To: <20170207054547.3690-1-ravi.bangoria@linux.vnet.ibm.com>
On Tue, 7 Feb 2017 11:15:47 +0530
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> wrote:
> There are many SDT markers in powerpc whose uprobe definition goes
> beyond current MAX_CMDLEN, especially when target filename is long
> and sdt marker has long list of arguments. For example, definition
> of sdt marker
>
> method__compile__end: 8@17 8@9 8@10 -4@8 8@7 -4@6 8@5 -4@4 1@37(28)
>
> from file
>
> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.91-2.b14.fc22.ppc64/jre/lib/\
> ppc64/server/libjvm.so
>
> is
>
> p:sdt_hotspot/method__compile__end /usr/lib/jvm/java-1.8.0-openjdk-\
> 1.8.0.91-2.b14.fc22.ppc64/jre/lib/ppc64/server/libjvm.so:0x4c4e00\
> arg1=%gpr17:u64 arg2=%gpr9:u64 arg3=%gpr10:u64 arg4=%gpr8:s32\
> arg5=%gpr7:u64 arg6=%gpr6:s32 arg7=%gpr5:u64 arg8=%gpr4:s32\
> arg9=+37(%gpr28):u8
>
> Perf probe fails with seg fault for such markers. As uprobe_events file
> accepts definition upto 4094 characters(4096 - 2 (\n\0)), increase value
> of MAX_CMDLEN to 4094.
This looks good to me.
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Thanks,
>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
> ---
> Changes in v2:
> - Set MAX_CMDLEN to 4094 instead of 512
>
> tools/perf/util/probe-event.c | 1 -
> tools/perf/util/probe-file.c | 3 ++-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 6a6f44d..e6e3244 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -47,7 +47,6 @@
> #include "probe-file.h"
> #include "session.h"
>
> -#define MAX_CMDLEN 256
> #define PERFPROBE_GROUP "probe"
>
> bool probe_event_dry_run; /* Dry run flag */
> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> index 38eca3c..fdabe7e 100644
> --- a/tools/perf/util/probe-file.c
> +++ b/tools/perf/util/probe-file.c
> @@ -29,7 +29,8 @@
> #include "session.h"
> #include "perf_regs.h"
>
> -#define MAX_CMDLEN 256
> +/* 4096 - 2 ('\n' + '\0') */
> +#define MAX_CMDLEN 4094
>
> static void print_open_warning(int err, bool uprobe)
> {
> --
> 2.9.3
>
--
Masami Hiramatsu <mhiramat@kernel.org>
next prev parent reply other threads:[~2017-03-21 5:19 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-16 23:55 [PATCH 0/2] perf: add support of SDT probes arguments Alexis Berlemont
2016-11-16 23:56 ` [PATCH 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-11-16 23:56 ` [PATCH 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2016-11-17 9:04 ` Hemant Kumar
2016-11-18 23:56 ` [PATCH v2 0/2] " Alexis Berlemont
2016-11-18 23:56 ` [PATCH v2 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-11-25 14:40 ` Arnaldo Carvalho de Melo
2016-11-26 0:58 ` [PATCH v4 0/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2016-12-05 23:42 ` Alexis Berlemont
2016-12-06 14:45 ` Arnaldo Carvalho de Melo
2016-11-26 0:58 ` [PATCH v4 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-12-07 2:44 ` Masami Hiramatsu
2016-11-26 0:58 ` [PATCH v4 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2016-12-07 3:26 ` Masami Hiramatsu
2016-12-09 15:14 ` Arnaldo Carvalho de Melo
2016-12-10 10:00 ` Masami Hiramatsu
2016-12-14 0:07 ` [PATCH v5 0/2] " Alexis Berlemont
2016-12-14 7:36 ` Ingo Molnar
2017-01-23 11:23 ` Ravi Bangoria
2017-02-22 22:41 ` Alexis Berlemont
2017-01-24 6:58 ` Ravi Bangoria
2017-01-24 8:22 ` Ingo Molnar
2017-01-24 8:36 ` Ravi Bangoria
2017-02-02 11:11 ` [PATCH 0/5] perf/sdt: Argument support for x86 and powepc Ravi Bangoria
2017-02-02 11:11 ` [PATCH 1/5] perf/sdt: Show proper hint Ravi Bangoria
2017-02-02 13:40 ` Ingo Molnar
2017-02-02 16:20 ` Arnaldo Carvalho de Melo
2017-02-03 10:26 ` [PATCH v2] " Ravi Bangoria
2017-02-03 15:18 ` Arnaldo Carvalho de Melo
2017-02-07 7:53 ` Ingo Molnar
2017-02-07 15:50 ` Arnaldo Carvalho de Melo
2017-02-07 8:00 ` Ingo Molnar
2017-02-16 10:16 ` [RFC] perf/sdt: Directly record SDT event with 'perf record' Ravi Bangoria
2017-02-20 7:08 ` Ingo Molnar
2017-02-20 8:21 ` Ravi Bangoria
2017-02-20 8:42 ` Ingo Molnar
2017-02-20 11:01 ` Ravi Bangoria
2017-02-20 14:11 ` Arnaldo Carvalho de Melo
2017-02-23 8:13 ` Ravi Bangoria
2017-02-23 12:48 ` Arnaldo Carvalho de Melo
2017-02-07 1:13 ` [PATCH v2] perf/sdt: Show proper hint Masami Hiramatsu
2017-02-10 7:44 ` [tip:perf/core] perf sdt: Show proper hint when event not yet in place via 'perf probe' tip-bot for Ravi Bangoria
2017-02-02 11:11 ` [PATCH 2/5] perf/sdt/x86: Add renaming logic for rNN and other registers Ravi Bangoria
2017-02-07 3:11 ` Masami Hiramatsu
2017-03-21 14:08 ` Arnaldo Carvalho de Melo
2017-03-24 18:45 ` [tip:perf/core] perf sdt x86: " tip-bot for Ravi Bangoria
2017-02-02 11:11 ` [PATCH 3/5] perf/sdt/x86: Move OP parser to tools/perf/arch/x86/ Ravi Bangoria
2017-02-07 3:11 ` Masami Hiramatsu
2017-02-07 5:22 ` Ravi Bangoria
2017-03-21 14:10 ` Arnaldo Carvalho de Melo
2017-03-21 23:00 ` Masami Hiramatsu
2017-03-22 11:22 ` Arnaldo Carvalho de Melo
2017-03-21 14:55 ` Masami Hiramatsu
2017-02-02 11:11 ` [PATCH 4/5] perf/sdt/powerpc: Add argument support Ravi Bangoria
2017-02-02 11:11 ` [PATCH 5/5] perf/probe: Change MAX_CMDLEN Ravi Bangoria
2017-02-07 1:40 ` Masami Hiramatsu
2017-02-07 5:45 ` [PATCH v2] " Ravi Bangoria
2017-03-21 5:19 ` Masami Hiramatsu [this message]
2017-03-21 13:37 ` Arnaldo Carvalho de Melo
2017-03-24 18:43 ` [tip:perf/core] perf probe: " tip-bot for Ravi Bangoria
2017-02-07 2:55 ` [PATCH 0/5] perf/sdt: Argument support for x86 and powepc Masami Hiramatsu
2017-03-06 7:53 ` Ravi Bangoria
2017-03-06 13:42 ` Masami Hiramatsu
2017-03-21 5:08 ` [PATCH v5 0/2] perf probe: add sdt probes arguments into the uprobe cmd string Masami Hiramatsu
2016-12-14 0:07 ` [PATCH v5 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2017-03-06 13:39 ` Masami Hiramatsu
2017-03-21 13:52 ` Arnaldo Carvalho de Melo
2017-03-24 18:44 ` [tip:perf/core] perf sdt: Add scanning of sdt probes arguments tip-bot for Alexis Berlemont
2016-12-14 0:07 ` [PATCH v5 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2017-01-24 8:50 ` Ravi Bangoria
2017-03-06 17:23 ` Masami Hiramatsu
2017-03-24 18:44 ` [tip:perf/core] perf probe: Add " tip-bot for Alexis Berlemont
2016-11-18 23:56 ` [PATCH v2 2/2] perf probe: add " Alexis Berlemont
2016-11-21 10:25 ` Hemant Kumar
2016-11-24 23:13 ` [PATCH v3 0/2] " Alexis Berlemont
2016-11-24 23:13 ` [PATCH v3 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-11-24 23:13 ` [PATCH v3 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
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=20170321141950.3dbd5ba41f660450ea9e0d71@kernel.org \
--to=mhiramat@kernel.org \
--cc=acme@redhat.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=alexis.berlemont@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=maddy@linux.vnet.ibm.com \
--cc=mingo@redhat.com \
--cc=mpe@ellerman.id.au \
--cc=naveen.n.rao@linux.vnet.ibm.com \
--cc=peterz@infradead.org \
--cc=ravi.bangoria@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).