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| author | Adrian Hunter <adrian.hunter@intel.com> | 2021-09-07 19:39:01 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-10-15 12:25:31 +0300 |
| commit | 8b8ff8cc3b8155c18162e8b1f70e1230db176862 (patch) | |
| tree | 7fa6284dbe477808c4a93170cfb6ea7ac5463980 /tools/bpf/bpf_exp.l | |
| parent | 41100833cdd8b1bef363b81a6482d74711c116ad (diff) | |
| download | linux-8b8ff8cc3b8155c18162e8b1f70e1230db176862.tar.xz | |
perf/x86: Add new event for AUX output counter index
PEBS-via-PT records contain a mask of applicable counters. To identify
which event belongs to which counter, a side-band event is needed. Until
now, there has been no side-band event, and consequently users were limited
to using a single event.
Add such a side-band event. Note the event is optimised to output only
when the counter index changes for an event. That works only so long as
all PEBS-via-PT events are scheduled together, which they are for a
recording session because they are in a single group.
Also no attribute bit is used to select the new event, so a new
kernel is not compatible with older perf tools. The assumption
being that PEBS-via-PT is sufficiently esoteric that users will not
be troubled by this.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210907163903.11820-2-adrian.hunter@intel.com
Diffstat (limited to 'tools/bpf/bpf_exp.l')
0 files changed, 0 insertions, 0 deletions