From 6127383217741615f3450b684ecbee1ff570ee98 Mon Sep 17 00:00:00 2001 From: Daniel Bristot de Oliveira Date: Tue, 6 Jun 2023 18:12:25 +0200 Subject: [PATCH] Documentation: Add tools/rtla timerlat -u option documentation Add the -u/--user-thread option documentation for timerlat top/hist. Link: https://lkml.kernel.org/r/bf727c8ccb8f50792200ae620141e047edf4af7a.1686066600.git.bristot@kernel.org Cc: William White Cc: Jonathan Corbet Tested-by: Juri Lelli Signed-off-by: Daniel Bristot de Oliveira Signed-off-by: Steven Rostedt (Google) --- Documentation/tools/rtla/common_timerlat_options.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/tools/rtla/common_timerlat_options.rst b/Documentation/tools/rtla/common_timerlat_options.rst index bacdea6de7a3..88506b397c2d 100644 --- a/Documentation/tools/rtla/common_timerlat_options.rst +++ b/Documentation/tools/rtla/common_timerlat_options.rst @@ -26,3 +26,10 @@ Set the /dev/cpu_dma_latency to *us*, aiming to bound exit from idle latencies. *cyclictest* sets this value to *0* by default, use **--dma-latency** *0* to have similar results. + +**-u**, **--user-threads** + + Set timerlat to run without a workload, and then dispatches user-space workloads + to wait on the timerlat_fd. Once the workload is awakes, it goes to sleep again + adding so the measurement for the kernel-to-user and user-to-kernel to the tracer + output. -- 2.25.1