perf/core: Add support for PERF_SAMPLE_CODE_PAGE_SIZE

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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 NMI-safe perf_get_page_size().

For large PEBS, it's very unlikely that the mapping is gone for the
earlier PEBS records. Enable the feature for the large PEBS. The worst
case is that page-size '0' is returned.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201001135749.2804-5-kan.liang@linux.intel.com

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Stephane Eranian 2020-10-01 06:57:49 -07:00 • committed by Peter Zijlstra

parent 4cb6a42e4c

commit 995f088efe

4 changed files with 15 additions and 3 deletions

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2

arch/x86/events/perf_event.h

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include/linux/perf_event.h

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include/uapi/linux/perf_event.h

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kernel/events/core.c

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