diff options
| author | Ilkka Koskinen <ilkka@os.amperecomputing.com> | 2025-08-28 15:35:19 -0700 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2025-09-18 13:52:13 +0100 |
| commit | 71396cfac97d0249fa7d8dcc8e649b6ba4c090e4 (patch) | |
| tree | 16fdce267f181fc3be6359c6a6f3ad8f6fabf216 /Documentation | |
| parent | drivers: perf: use us_to_ktime() where appropriate (diff) | |
| download | linux-71396cfac97d0249fa7d8dcc8e649b6ba4c090e4.tar.gz linux-71396cfac97d0249fa7d8dcc8e649b6ba4c090e4.zip | |
perf/dwc_pcie: Support counting multiple lane events in parallel
While Designware PCIe PMU allows to count only one time based event
at a time, it allows to count all the lane events simultaneously.
After the patch one is able to count a group of lane events:
$ perf stat -e '{dwc_rootport/tx_memory_write,lane=1/,dwc_rootport/rx_memory_read,lane=0/}' dd if=/dev/nvme0n1 of=/dev/null bs=1M count=1
Earlier the events wouldn't have been counted successfully.
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/perf/dwc_pcie_pmu.rst | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Documentation/admin-guide/perf/dwc_pcie_pmu.rst b/Documentation/admin-guide/perf/dwc_pcie_pmu.rst index cb376f335f40..167f9281fbf5 100644 --- a/Documentation/admin-guide/perf/dwc_pcie_pmu.rst +++ b/Documentation/admin-guide/perf/dwc_pcie_pmu.rst @@ -16,8 +16,8 @@ provides the following two features: - one 64-bit counter for Time Based Analysis (RX/TX data throughput and time spent in each low-power LTSSM state) and -- one 32-bit counter for Event Counting (error and non-error events for - a specified lane) +- one 32-bit counter per event for Event Counting (error and non-error + events for a specified lane) Note: There is no interrupt for counter overflow. |