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Date:   Tue, 20 Oct 2020 16:16:10 +0800
From:   Leo Yan <leo.yan@linaro.org>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Will Deacon <will@kernel.org>, kan.liang@linux.intel.com,
        mingo@redhat.com, acme@kernel.org, linux-kernel@vger.kernel.org,
        mark.rutland@arm.com, alexander.shishkin@linux.intel.com,
        jolsa@redhat.com, eranian@google.com, ak@linux.intel.com,
        dave.hansen@intel.com, kirill.shutemov@linux.intel.com,
        mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org,
        David Miller <davem@davemloft.net>
Subject: Re: [PATCH V9 1/4] perf/core: Add PERF_SAMPLE_DATA_PAGE_SIZE
Message-ID: <20201020081610.GE13630@leoy-ThinkPad-X240s>
References: <20201001135749.2804-1-kan.liang@linux.intel.com>
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 <20201009093750.GD29594@willie-the-truck>
 <20201009095300.GI2628@hirez.programming.kicks-ass.net>
 <20201020024925.GB13630@leoy-ThinkPad-X240s>
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On Tue, Oct 20, 2020 at 09:19:45AM +0200, Peter Zijlstra wrote:
> On Tue, Oct 20, 2020 at 10:49:25AM +0800, Leo Yan wrote:
> > I can see there have another potentail customer to use page-size is
> > Arm SPE, but Arm SPE is hardware trace based sample but not interrupt
> > based sample.  For this case, I think this patch set cannot be
> > directly applied to the AUX trace data.
> 
> IIRC SPE is decoded in userspace, at which point we simply cannot access
> this data.

Yes, it's decoded in userspace.

Thanks for clarification!
Leo