linux-kernel - Re: [PATCH V6 02/16] perf/x86/intel: Support PERF_SAMPLE_DATA_PAGE

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Date:   Mon, 10 Aug 2020 23:40:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kan Liang <kan.liang@...ux.intel.com>
Cc:     acme@...nel.org, mingo@...hat.com, 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
Subject: Re: [PATCH V6 02/16] perf/x86/intel: Support
 PERF_SAMPLE_DATA_PAGE_SIZE

On Mon, Aug 10, 2020 at 02:24:22PM -0700, Kan Liang wrote:
> The new sample type, PERF_SAMPLE_DATA_PAGE_SIZE, requires the virtual
> address. Update the data->addr if the sample type is set.
> 
> The large PEBS is disabled with the sample type, because perf doesn't
> support munmap tracking yet. The PEBS buffer for large PEBS cannot be
> flushed for each munmap. Wrong page size may be calculated. The large
> PEBS can be enabled later separately when munmap tracking is supported.


You also get to fix up Power.

arch/powerpc/perf/core-book3s.c:                    (PERF_SAMPLE_ADDR | PERF_SAMPLE_PHYS_ADDR))