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| author | Stephane Eranian <eranian@google.com> | 2020-10-01 16:57:49 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-10-29 13:00:39 +0300 |
| commit | 995f088efebe1eba0282a6ffa12411b37f8990c2 (patch) | |
| tree | 9e3185b05657e50aa991790dde6d74ba4dd8ee02 /include/uapi/linux/perf_event.h | |
| parent | 4cb6a42e4c4bc1902644eced67563e7405d4588e (diff) | |
| download | linux-995f088efebe1eba0282a6ffa12411b37f8990c2.tar.xz | |
perf/core: Add support for PERF_SAMPLE_CODE_PAGE_SIZE
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
Diffstat (limited to 'include/uapi/linux/perf_event.h')
| -rw-r--r-- | include/uapi/linux/perf_event.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index cc6ea346e9f9..c2f20ee3124d 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -144,8 +144,9 @@ enum perf_event_sample_format { PERF_SAMPLE_AUX = 1U << 20, PERF_SAMPLE_CGROUP = 1U << 21, PERF_SAMPLE_DATA_PAGE_SIZE = 1U << 22, + PERF_SAMPLE_CODE_PAGE_SIZE = 1U << 23, - PERF_SAMPLE_MAX = 1U << 23, /* non-ABI */ + PERF_SAMPLE_MAX = 1U << 24, /* non-ABI */ __PERF_SAMPLE_CALLCHAIN_EARLY = 1ULL << 63, /* non-ABI; internal use */ }; @@ -898,6 +899,7 @@ enum perf_event_type { * { u64 size; * char data[size]; } && PERF_SAMPLE_AUX * { u64 data_page_size;} && PERF_SAMPLE_DATA_PAGE_SIZE + * { u64 code_page_size;} && PERF_SAMPLE_CODE_PAGE_SIZE * }; */ PERF_RECORD_SAMPLE = 9, |