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Message-ID: <20130620083327.GA5288@gmail.com>
Date: Thu, 20 Jun 2013 10:33:28 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Jed Davis <jld@...illa.com>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Will Deacon <will.deacon@....com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Paul Mackerras <paulus@...ba.org>,
Ingo Molnar <mingo@...hat.com>,
Catalin Marinas <catalin.marinas@....com>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] perf: arm64: Record the user-mode PC in the call chain.
* Jed Davis <jld@...illa.com> wrote:
> With this change, we no longer lose the innermost entry in the user-mode
> part of the call chain. See also the x86 port, which includes the ip,
> and the corresponding change in arch/arm.
>
> Signed-off-by: Jed Davis <jld@...illa.com>
> ---
> arch/arm64/kernel/perf_event.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
> index 1e49e5eb..9ba33c4 100644
> --- a/arch/arm64/kernel/perf_event.c
> +++ b/arch/arm64/kernel/perf_event.c
> @@ -1336,6 +1336,7 @@ void perf_callchain_user(struct perf_callchain_entry *entry,
> return;
> }
>
> + perf_callchain_store(entry, regs->pc);
> tail = (struct frame_tail __user *)regs->regs[29];
>
> while (entry->nr < PERF_MAX_STACK_DEPTH &&
Acked-by: Ingo Molnar <mingo@...nel.org>
I suspect this goes to v3.10 via the ARM64 tree?
Thanks,
Ingo
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