perf expr: Make the online topology accessible globally

Knowing the topology of online CPUs is useful for more than just expr
literals. Move to a global function that caches the value. An
additional upside is that this may also avoid computing the CPU
topology in some situations.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Link: https://lore.kernel.org/r/20230219092848.639226-8-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/tools/perf/util/smt.c b/tools/perf/util/smt.c
index 994e9e418227..650e804d0adc 100644
--- a/tools/perf/util/smt.c
+++ b/tools/perf/util/smt.c
@@ -4,7 +4,7 @@
 #include "cputopo.h"
 #include "smt.h"
 
-bool smt_on(const struct cpu_topology *topology)
+bool smt_on(void)
 {
 	static bool cached;
 	static bool cached_result;
@@ -16,22 +16,21 @@ bool smt_on(const struct cpu_topology *topology)
 	if (sysfs__read_int("devices/system/cpu/smt/active", &fs_value) >= 0)
 		cached_result = (fs_value == 1);
 	else
-		cached_result = cpu_topology__smt_on(topology);
+		cached_result = cpu_topology__smt_on(online_topology());
 
 	cached = true;
 	return cached_result;
 }
 
-bool core_wide(bool system_wide, const char *user_requested_cpu_list,
-	       const struct cpu_topology *topology)
+bool core_wide(bool system_wide, const char *user_requested_cpu_list)
 {
 	/* If not everything running on a core is being recorded then we can't use core_wide. */
 	if (!system_wide)
 		return false;
 
 	/* Cheap case that SMT is disabled and therefore we're inherently core_wide. */
-	if (!smt_on(topology))
+	if (!smt_on())
 		return true;
 
-	return cpu_topology__core_wide(topology, user_requested_cpu_list);
+	return cpu_topology__core_wide(online_topology(), user_requested_cpu_list);
 }