linux-kernel - Re: [PATCH V6 03/16] perf/core: Add support for PERF_SAMPLE_CODE_PAGE

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Message-ID: <20200810214100.GL3982@worktop.programming.kicks-ass.net>
Date:   Mon, 10 Aug 2020 23:41:00 +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 03/16] perf/core: Add support for
 PERF_SAMPLE_CODE_PAGE_SIZE

On Mon, Aug 10, 2020 at 02:24:23PM -0700, Kan Liang wrote:
> From: Stephane Eranian <eranian@...gle.com>
> 
> When studying code layout, it is useful to capture the page size of the
> sampled code address.
> 
> Add a new sample type for code page size.
> The new sample type requires collecting the ip. The code page size can
> be calculated from the IRQ-safe perf_get_page_size().
> 
> Only the generic support is covered. The large PEBS will be disabled
> with this sample type.

-ENOREASON