linux-kernel - Re: [PATCH 8/8] trace_uprobe/sdt: Document about reference counter

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Message-Id: <20180315214750.fc1d53d01045d8e6c1e8e491@kernel.org>
Date:   Thu, 15 Mar 2018 21:47:50 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
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Subject: Re: [PATCH 8/8] trace_uprobe/sdt: Document about reference counter

Hi Ravi,

On Wed, 14 Mar 2018 20:52:59 +0530
Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:

> On 03/14/2018 07:20 PM, Masami Hiramatsu wrote:
> > On Tue, 13 Mar 2018 18:26:03 +0530
> > Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com> wrote:
> >
> >> No functionality changes.
> > Please consider to describe what is this change and why, here.
> 
> Will add in next version.

Thanks, and could you also move this before perf-probe patch?
Also Could you make perf-probe check the tracing/README whether
the kernel supports reference counter syntax or not?

perf-tool can be used on older (or stable) kernel.

Thank you,

> 
> >> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> >> ---
> >>  Documentation/trace/uprobetracer.txt | 16 +++++++++++++---
> >>  kernel/trace/trace.c                 |  2 +-
> >>  2 files changed, 14 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/Documentation/trace/uprobetracer.txt b/Documentation/trace/uprobetracer.txt
> >> index bf526a7c..8fb13b0 100644
> >> --- a/Documentation/trace/uprobetracer.txt
> >> +++ b/Documentation/trace/uprobetracer.txt
> >> @@ -19,15 +19,25 @@ user to calculate the offset of the probepoint in the object.
> >>  
> >>  Synopsis of uprobe_tracer
> >>  -------------------------
> >> -  p[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a uprobe
> >> -  r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a return uprobe (uretprobe)
> >> -  -:[GRP/]EVENT                           : Clear uprobe or uretprobe event
> >> +  p[:[GRP/]EVENT] PATH:OFFSET[(REF_CTR_OFFSET)] [FETCHARGS]
> >> +  r[:[GRP/]EVENT] PATH:OFFSET[(REF_CTR_OFFSET)] [FETCHARGS]
> > Ah, OK in this context, [] means optional syntax :)
> 
> Correct.
> 
> Thanks,
> Ravi
> 


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