diff options
| author | Sandipan Das <sandipan.das@amd.com> | 2022-08-11 18:00:00 +0530 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-08-27 00:05:45 +0200 |
| commit | 93315e46b000fc80fff5d53c3f444417fb3df6de (patch) | |
| tree | e0f87db286a0c398c45aac05387b06407942ca94 /include/linux/perf_event.h | |
| parent | 245268c19f701c7222dedcb6a383bc73d63925d4 (diff) | |
| download | lwn-93315e46b000fc80fff5d53c3f444417fb3df6de.tar.gz lwn-93315e46b000fc80fff5d53c3f444417fb3df6de.zip | |
perf/core: Add speculation info to branch entries
Add a new "spec" bitfield to branch entries for providing speculation
information. This will be populated using hints provided by branch sampling
features on supported hardware. The following cases are covered:
* No branch speculation information is available
* Branch is speculative but taken on the wrong path
* Branch is non-speculative but taken on the correct path
* Branch is speculative and taken on the correct path
Suggested-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Sandipan Das <sandipan.das@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/834088c302faf21c7b665031dd111f424e509a64.1660211399.git.sandipan.das@amd.com
Diffstat (limited to 'include/linux/perf_event.h')
| -rw-r--r-- | include/linux/perf_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index ee8b9ecdc03b..ae30c61957d2 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1078,6 +1078,7 @@ static inline void perf_clear_branch_entry_bitfields(struct perf_branch_entry *b br->abort = 0; br->cycles = 0; br->type = 0; + br->spec = PERF_BR_SPEC_NA; br->reserved = 0; } |