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 17:44:33 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...hat.com, 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 12:17:53PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Aug 25, 2016 at 03:59:43PM +0200, Jiri Olsa escreveu:
> > 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
> 
> Ok, so I'll add a Tested-by: Jiri, ok? And push it via perf/urgent.

yep, thanks

jirka