linux-kernel - Re: perf tools: add support for generating bpf prologue on powerpc

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Date:	Mon, 09 May 2016 17:53:30 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Wang Nan <wangnan0@...wei.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Ian Munsie <imunsie@....ibm.com>
Subject: Re: perf tools: add support for generating bpf prologue on powerpc

On Sat, 2016-05-07 at 16:43 +0530, Naveen N. Rao wrote:
> On 2016/05/07 02:15PM, Michael Ellerman wrote:
> > On Thu, 2016-05-05 at 15:23:19 UTC, "Naveen N. Rao" wrote:
> > > Generalize existing macros to serve the purpose.
> > > 
> > > Cc: Wang Nan <wangnan0@...wei.com>
> > > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > > Cc: Masami Hiramatsu <mhiramat@...nel.org>
> > > Cc: Ian Munsie <imunsie@....ibm.com>
> > > Cc: Michael Ellerman <mpe@...erman.id.au>
> > > Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> > > ---
> > > With this patch:
> > >     # ./perf test 37
> > >     37: Test BPF filter                                          :
> > >     37.1: Test basic BPF filtering                               : Ok
> > >     37.2: Test BPF prologue generation                           : Ok
> > >     37.3: Test BPF relocation checker                            : Ok
> > > 
> > >  tools/perf/arch/powerpc/Makefile          |  1 +
> > >  tools/perf/arch/powerpc/util/dwarf-regs.c | 40 +++++++++++++++++++++----------
> > >  2 files changed, 29 insertions(+), 12 deletions(-)
> > 
> > Looks feasible, and is in powerpc only code, should I take this or acme?
> 
> Hi Michael,
> Arnaldo has already pulled this in:
> http://article.gmane.org/gmane.linux.kernel/2216051

Ah sorry.

> It would be good if you can consider user stackdump as that depends on 
> perf regs support which you have added to powerpc-next:
> http://thread.gmane.org/gmane.linux.kernel/2210299/focus=2210749

Yep I did, it's in next.

https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=826dccfd238c3eeac379f5f637e5a3ddc7a4bc22

cheers