From a5bde5d8fde8a8cb28e59a672d5ddc5b9c1e7656 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Wed, 5 Aug 2026 07:52:36 -0700 Subject: workqueue: skip the node_nr_active update for non-unbound workqueues apply_wqattrs_commit() updates node_nr_active->max unconditionally. wq->node_nr_active[] is only allocated for unbound workqueues, so guard the call before per-cpu workqueues start using this path. No functional change: only unbound workqueues reach apply_wqattrs_*() today. Signed-off-by: Breno Leitao Signed-off-by: Tejun Heo --- tools/perf/util/smt.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 tools/perf/util/smt.c (limited to 'tools/perf/util/smt.c') diff --git a/tools/perf/util/smt.c b/tools/perf/util/smt.c new file mode 100644 index 000000000..650e804d0 --- /dev/null +++ b/tools/perf/util/smt.c @@ -0,0 +1,36 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include "api/fs/fs.h" +#include "cputopo.h" +#include "smt.h" + +bool smt_on(void) +{ + static bool cached; + static bool cached_result; + int fs_value; + + if (cached) + return cached_result; + + if (sysfs__read_int("devices/system/cpu/smt/active", &fs_value) >= 0) + cached_result = (fs_value == 1); + else + 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) +{ + /* 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()) + return true; + + return cpu_topology__core_wide(online_topology(), user_requested_cpu_list); +} -- cgit v1.3.1