Re: [PATCH 02/17] perf: Add ability to attach user level registersdump to sample

[Frederic Weisbecker]

On Sun, Jul 22, 2012 at 02:14:25PM +0200, Jiri Olsa wrote:
> Introducing PERF_SAMPLE_REGS_USER sample type bit to trigger
> the dump of user level registers on sample. Registers we want
> to dump are specified by sample_regs_user bitmask.
> 
> Only user level registers are dumped at the moment. Meaning the
> register values of the user space context as it was before the
> user entered the kernel for whatever reason (syscall, irq,
> exception, or a PMI happening in userspace).
> 
> The layout of the sample_regs_user bitmap is described in
> asm/perf_regs.h for archs that support register dump.
> 
> This is going to be useful to bring Dwarf CFI based stack
> unwinding on top of samples.
> 
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> Original-patch-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>

Acked-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
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