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| author | Kan Liang <kan.liang@linux.intel.com> | 2021-04-12 17:30:43 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-04-19 21:03:24 +0300 |
| commit | 61e76d53c39bb768ad264d379837cfc56b9e35b4 (patch) | |
| tree | 58189a025db2176b83d02ff4a9aae91a02761375 /arch/x86/events/perf_event.h | |
| parent | 250b3c0d79d1f4a55e54d8a9ef48058660483fef (diff) | |
| download | linux-61e76d53c39bb768ad264d379837cfc56b9e35b4.tar.xz | |
perf/x86: Track pmu in per-CPU cpu_hw_events
Some platforms, e.g. Alder Lake, have hybrid architecture. In the same
package, there may be more than one type of CPU. The PMU capabilities
are different among different types of CPU. Perf will register a
dedicated PMU for each type of CPU.
Add a 'pmu' variable in the struct cpu_hw_events to track the dedicated
PMU of the current CPU.
Current x86_get_pmu() use the global 'pmu', which will be broken on a
hybrid platform. Modify it to apply the 'pmu' of the specific CPU.
Initialize the per-CPU 'pmu' variable with the global 'pmu'. There is
nothing changed for the non-hybrid platforms.
The is_x86_event() will be updated in the later patch ("perf/x86:
Register hybrid PMUs") for hybrid platforms. For the non-hybrid
platforms, nothing is changed here.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/1618237865-33448-4-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to 'arch/x86/events/perf_event.h')
| -rw-r--r-- | arch/x86/events/perf_event.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 54a340e42a22..da947d3d14a5 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -326,6 +326,8 @@ struct cpu_hw_events { int n_pair; /* Large increment events */ void *kfree_on_online[X86_PERF_KFREE_MAX]; + + struct pmu *pmu; }; #define __EVENT_CONSTRAINT_RANGE(c, e, n, m, w, o, f) { \ @@ -904,7 +906,7 @@ static struct perf_pmu_events_ht_attr event_attr_##v = { \ .event_str_ht = ht, \ } -struct pmu *x86_get_pmu(void); +struct pmu *x86_get_pmu(unsigned int cpu); extern struct x86_pmu x86_pmu __read_mostly; static __always_inline struct x86_perf_task_context_opt *task_context_opt(void *ctx) |