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| author | Stephane Eranian <eranian@google.com> | 2022-03-22 15:15:08 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-04-05 10:24:37 +0200 |
| commit | 44175993efbae04e8b2d7f7795ff512c3a726db0 (patch) | |
| tree | 367733796be5c8a0bb9361dbadf3067d124f32d2 /arch/x86/events/amd | |
| parent | ada543459cab7f653dcacdaba4011a8bb19c627c (diff) | |
| download | linux-44175993efbae04e8b2d7f7795ff512c3a726db0.tar.bz2 | |
perf/x86/amd: Add branch-brs helper event for Fam19h BRS
Add a pseudo event called branch-brs to help use the FAM Fam19h
Branch Sampling feature (BRS). BRS samples taken branches, so it is best used
when sampling on a retired taken branch event (0xc4) which is what BRS
captures. Instead of trying to remember the event code or actual event name,
users can simply do:
$ perf record -b -e cpu/branch-brs/ -c 1000037 .....
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220322221517.2510440-5-eranian@google.com
Diffstat (limited to 'arch/x86/events/amd')
| -rw-r--r-- | arch/x86/events/amd/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c index c7ac70d8ed9a..f7bce8364fe4 100644 --- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -1145,8 +1145,23 @@ static struct attribute_group group_caps_amd_brs = { .is_visible = amd_brs_is_visible, }; +EVENT_ATTR_STR(branch-brs, amd_branch_brs, + "event=" __stringify(AMD_FAM19H_BRS_EVENT)"\n"); + +static struct attribute *amd_brs_events_attrs[] = { + EVENT_PTR(amd_branch_brs), + NULL, +}; + +static struct attribute_group group_events_amd_brs = { + .name = "events", + .attrs = amd_brs_events_attrs, + .is_visible = amd_brs_is_visible, +}; + static const struct attribute_group *amd_attr_update[] = { &group_caps_amd_brs, + &group_events_amd_brs, NULL, }; |