linux-kernel - Re: [PATCH 0/5] perf/sdt: Argument support for x86 and powepc

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Date:   Tue, 7 Feb 2017 11:55:50 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     acme@...hat.com, alexis.berlemont@...il.com,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        mpe@...erman.id.au, naveen.n.rao@...ux.vnet.ibm.com,
        mhiramat@...nel.org, maddy@...ux.vnet.ibm.com
Subject: Re: [PATCH 0/5] perf/sdt: Argument support for x86 and powepc

On Thu,  2 Feb 2017 16:41:38 +0530
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:

> The v5 patchset for sdt marker argument support for x86 [1] has
> couple  of issues. For example, it still has x86 specific code
> in general code. It lacks support for rNN (with size postfix
> b/w/d), %rsp, %esp, %sil etc. registers and such sdt markers
> are failing at 'perf probe'. It also fails to convert arguments
> having no offset but still surrounds register with parenthesis
> for ex. 8@(%rdi) is converted to +(%di):u64 which is rejected
> by uprobe_events. It's causing failure at 'perf probe' for all
> SDT events on all archs except x86. With this patchset, I've
> solved these issues. (patch 2,3)
> 
> Also, existing perf shows misleading message when user tries to
> record sdt event without probing it. I've prepared patch for
> the same. (patch 1)
> 
> Apart from that, I've also added logic to support arguments with
> sdt marker on powerpc. (patch 4)
> 
> There are cases where uprobe definition of sdt event goes beyond
> current limit MAX_CMDLEN (256) and in such case perf fails with
> seg fault. I've solve this issue. (patch 5)
> 
> Note: This patchset is prepared on top of Alexis' v5 series.[1]
> 
> [1] http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1292251.html

Hmm, I must missed it. I'll check it...

Thanks!


> 
> Ravi Bangoria (5):
>   perf/sdt: Show proper hint
>   perf/sdt/x86: Add renaming logic for rNN and other registers
>   perf/sdt/x86: Move OP parser to tools/perf/arch/x86/
>   perf/sdt/powerpc: Add argument support
>   perf/probe: Change MAX_CMDLEN
> 
>  tools/lib/api/fs/tracing_path.c          |  16 +++-
>  tools/perf/arch/powerpc/util/perf_regs.c | 115 ++++++++++++++++++++++++++
>  tools/perf/arch/x86/util/perf_regs.c     | 137 ++++++++++++++++++++++++++++---
>  tools/perf/util/perf_regs.c              |   9 +-
>  tools/perf/util/perf_regs.h              |   7 +-
>  tools/perf/util/probe-event.c            |   1 -
>  tools/perf/util/probe-file.c             | 129 ++++++++---------------------
>  7 files changed, 294 insertions(+), 120 deletions(-)
> 
> -- 
> 2.9.3
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>