linux-kernel - Re: [PATCH v2 2/2] perf uprobe: Skip prologue if program compiled without optimization

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Date:   Thu, 25 Aug 2016 15:59:43 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, wangnan0@...wei.com,
        hemant@...ux.vnet.ibm.com, naveen.n.rao@...ux.vnet.ibm.com,
        mpetlan@...hat.com
Subject: Re: [PATCH v2 2/2] perf uprobe: Skip prologue if program compiled
 without optimization

On Thu, Aug 25, 2016 at 09:50:04PM +0900, Masami Hiramatsu wrote:

SNIP

> > After applying patch:
> > 
> >   $ ./perf probe -x ./test 'foo i'
> >   $ cat /sys/kernel/debug/tracing/uprobe_events
> >     p:probe_test/foo /home/ravi/test:0x0000000000000541 i=-4(%bp):s32
> > 
> >   $ ./perf record -e probe_test:foo ./test
> >   $ ./perf script
> >     test  6300 [001]  5877.879327: probe_test:foo: (400541) i=42
> > 
> > No need to skip prologue for optimized case since debug info is correct
> > for each instructions for -O2 -g. For more details please visit:
> >         https://bugzilla.redhat.com/show_bug.cgi?id=612253#c6
> > 
> > Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> 
> Looks good for me:)
> 
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Jiri, Michael, please try this. Ravi's patch can fix your problem.

yes, that fixes the problem for me

thanks a lot,
jirka