Improve help message for TRACE() buffer

It's not being allocated per cpu anymore. Further, provide a hint to
the user where to find the data in userspace.

1 files changed, 6 insertions, 1 deletions

diff --git a/litmus/Kconfig b/litmus/Kconfig
index a3341021f05..d62c417f261 100644
--- a/litmus/Kconfig
+++ b/litmus/Kconfig
@@ -156,7 +156,7 @@ config SCHED_DEBUG_TRACE_SHIFT
        default 18
        help
 
-        Select the amount of memory needed per CPU for the TRACE() buffer, as a
+        Select the amount of memory needed per for the TRACE() buffer, as a
         power of two. The TRACE() buffer is global and statically allocated. If
         the buffer is too small, there will be holes in the TRACE() log if the
         buffer-flushing task is starved.
@@ -169,6 +169,11 @@ config SCHED_DEBUG_TRACE_SHIFT
                   18 => 256KB
                   20 =>   1MB
 
+        This buffer is exported to usespace using a misc device as
+        'litmus/log'. On a system with default udev rules, a corresponding
+        character device node should be created at /dev/litmus/log. The buffer
+        can be flushed using cat, e.g., 'cat /dev/litmus/log > my_log_file.txt'.
+
 endmenu
 
 endmenu