linux-kernel - Re: [PATCH 0/2] ARM64: perf: add support for the perf registers and dwarf unwinding

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Message-ID: <20131115164213.GJ19468@mudshark.cambridge.arm.com>
Date:	Fri, 15 Nov 2013 16:42:13 +0000
From:	Will Deacon <will.deacon@....com>
To:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
Cc:	Jean Pihet <jean.pihet@...aro.org>, Jiri Olsa <jolsa@...hat.com>,
	Arnaldo <acme@...stprotocols.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Patch Tracking <patches@...aro.org>,
	Jean Pihet <jean.pihet@...oldbits.com>
Subject: Re: [PATCH 0/2] ARM64: perf: add support for the perf registers and
 dwarf unwinding

On Thu, Nov 14, 2013 at 11:04:04AM +0000, Sandeepa Prabhu wrote:
> Hi Jean,
> 
> I have applied this patchset on aarch64 upstream branch,cross-compiled
> for arm64 and try running some tests for hardware breakpoints.
> 
> I cross-compiled perf using linaro toolchain
> "gcc-linaro-aarch64-linux-gnu-4.7-2013.04-20130415_linux" as
>  $ cd tools/perf/
>  $ make LDFLAGS=-static ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-
> 
> Copied the static binary to my initrd image and tried running tests to
> place hw_breakpoint on an kernel symbol as:
> 
>  # perf record -e "mem:0xffffffc00013f640:x"

Right, but that's not a valid invocation of perf. You have to give it
something to record. Something like:

# perf record -e mem:0xffffffc00013f640:x -a -- sleep 10

for example.

Will
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