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| author | Breno Leitao <leitao@debian.org> | 2026-04-01 16:03:56 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-04-01 23:24:18 +0300 |
| commit | 24b2e73f9700e0682575feb34556b756e59d4548 (patch) | |
| tree | 6a552c44ac92a8d441ab7fd9264dcd5897d713a6 /lib/Kconfig.debug | |
| parent | 738390a5321c7d34f468bc69f7232db711210bc0 (diff) | |
| download | linux-24b2e73f9700e0682575feb34556b756e59d4548.tar.xz | |
workqueue: add test_workqueue benchmark module
Add a kernel module that benchmarks queue_work() throughput on an
unbound workqueue to measure pool->lock contention under different
affinity scope configurations (cache vs cache_shard).
The module spawns N kthreads (default: num_online_cpus()), each bound
to a different CPU. All threads start simultaneously and queue work
items, measuring the latency of each queue_work() call. Results are
reported as p50/p90/p95 latencies for each affinity scope.
The affinity scope is switched between runs via the workqueue's sysfs
affinity_scope attribute (WQ_SYSFS), avoiding the need for any new
exported symbols.
The module runs as __init-only, returning -EAGAIN to auto-unload,
and can be re-run via insmod.
Example of the output:
running 50 threads, 50000 items/thread
cpu 6806017 items/sec p50=2574 p90=5068 p95=5818 ns
smt 6821040 items/sec p50=2624 p90=5168 p95=5949 ns
cache_shard 1633653 items/sec p50=5337 p90=9694 p95=11207 ns
cache 286069 items/sec p50=72509 p90=82304 p95=85009 ns
numa 319403 items/sec p50=63745 p90=73480 p95=76505 ns
system 308461 items/sec p50=66561 p90=75714 p95=78048 ns
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 4e2dfbbd3d78..cba976b29f32 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2654,6 +2654,16 @@ config TEST_VMALLOC If unsure, say N. +config TEST_WORKQUEUE + tristate "Test module for stress/performance analysis of workqueue" + default n + help + This builds the "test_workqueue" module for benchmarking + workqueue throughput under contention. Useful for evaluating + affinity scope changes (e.g., cache_shard vs cache). + + If unsure, say N. + config TEST_BPF tristate "Test BPF filter functionality" depends on m && NET |