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/Documentation/perf.txt | 96 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 tools/perf/Documentation/perf.txt (limited to 'tools/perf/Documentation/perf.txt') diff --git a/tools/perf/Documentation/perf.txt b/tools/perf/Documentation/perf.txt new file mode 100644 index 000000000..cbcc2e4d5 --- /dev/null +++ b/tools/perf/Documentation/perf.txt @@ -0,0 +1,96 @@ +perf(1) +======= + +NAME +---- +perf - Performance analysis tools for Linux + +SYNOPSIS +-------- +[verse] +'perf' [--version] [--help] [OPTIONS] COMMAND [ARGS] + +OPTIONS +------- +-h:: +--help:: + Run perf help command. + +-v:: +--version:: + Display perf version. + +-vv:: + Print the compiled-in status of libraries. + +--exec-path:: + Display or set exec path. + +--html-path:: + Display html documentation path. + +-p:: +--paginate:: + Set up pager. + +--no-pager:: + Do not set pager. + +--buildid-dir:: + Setup buildid cache directory. It has higher priority + than buildid.dir config file option. + +--list-cmds:: + List the most commonly used perf commands. + +--list-opts:: + List available perf options. + +--debugfs-dir:: + Set debugfs directory or set environment variable PERF_DEBUGFS_DIR. + +--debug:: + Setup debug variable (see list below) in value + range (0, 10). Use like: + --debug verbose # sets verbose = 1 + --debug verbose=2 # sets verbose = 2 + + List of debug variables allowed to set: + verbose - general debug messages + ordered-events - ordered events object debug messages + data-convert - data convert command debug messages + stderr - write debug output (option -v) to stderr + in browser mode + perf-event-open - Print perf_event_open() arguments and + return value + kmaps - Print kernel and module maps (perf script + and perf report without browser) + +--debug-file:: + Write debug output to a specified file. + +DESCRIPTION +----------- +Performance counters for Linux are a new kernel-based subsystem +that provide a framework for all things performance analysis. It +covers hardware level (CPU/PMU, Performance Monitoring Unit) features +and software features (software counters, tracepoints) as well. + +SEE ALSO +-------- +linkperf:perf-stat[1], linkperf:perf-top[1], +linkperf:perf-record[1], linkperf:perf-report[1], +linkperf:perf-list[1] + +linkperf:perf-amd-ibs[1], linkperf:perf-annotate[1], +linkperf:perf-archive[1], linkperf:perf-arm-spe[1], +linkperf:perf-bench[1], linkperf:perf-buildid-cache[1], +linkperf:perf-buildid-list[1], linkperf:perf-c2c[1], +linkperf:perf-config[1], linkperf:perf-data[1], linkperf:perf-diff[1], +linkperf:perf-evlist[1], linkperf:perf-ftrace[1], +linkperf:perf-help[1], linkperf:perf-inject[1], +linkperf:perf-intel-pt[1], linkperf:perf-iostat[1], linkperf:perf-kallsyms[1], +linkperf:perf-kmem[1], linkperf:perf-kvm[1], linkperf:perf-lock[1], +linkperf:perf-mem[1], linkperf:perf-probe[1], linkperf:perf-sched[1], +linkperf:perf-script[1], linkperf:perf-test[1], +linkperf:perf-trace[1], linkperf:perf-version[1] -- cgit v1.3.1