linux-kernel - Re: [PATCH v2] perf: libdw support for powerpc

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Message-ID: <20170615121355.GE24413@krava>
Date:   Thu, 15 Jun 2017 14:13:55 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, acme@...nel.org,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2] perf: libdw support for powerpc

On Thu, Jun 01, 2017 at 12:24:41PM +0200, Paolo Bonzini wrote:
> Porting PPC to libdw only needs an architecture-specific hook to move
> the register state from perf to libdw.
> 
> The ARM and x86 architectures already use libdw, and it is useful to
> have as much common code for the unwinder as possible.  Mark Wielaard
> has contributed a frame-based unwinder to libdw, so that unwinding works
> even for binaries that do not have CFI information.  In addition,
> libunwind is always preferred to libdw by the build machinery so this
> cannot introduce regressions on machines that have both libunwind and
> libdw installed.
> 
> Cc: acme@...nel.org
> Cc: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> Cc: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

looks good and got possitive feedback from our QE testing this

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka