linux-kernel - Re: [PATCH V9 1/4] perf/core: Add PERF_SAMPLE_DATA_PAGE

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Message-ID: <20201020071945.GW2611@hirez.programming.kicks-ass.net>
Date:   Tue, 20 Oct 2020 09:19:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Will Deacon <will@...nel.org>, kan.liang@...ux.intel.com,
        mingo@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, eranian@...gle.com, ak@...ux.intel.com,
        dave.hansen@...el.com, kirill.shutemov@...ux.intel.com,
        mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH V9 1/4] perf/core: Add PERF_SAMPLE_DATA_PAGE_SIZE

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.