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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-02 20:43:10 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-11 02:39:40 +0100 |
| commit | 28575c61ea602537a3d86fe301a53554e59452ae (patch) | |
| tree | f7214b99b1dbe7c46f2b859b07452dc3f336f85c /kernel/trace/Kconfig | |
| parent | ftrace: Clean up the recursion code a bit (diff) | |
| download | linux-28575c61ea602537a3d86fe301a53554e59452ae.tar.xz linux-28575c61ea602537a3d86fe301a53554e59452ae.zip | |
ring-buffer: Add recording of ring buffer recursion into recursed_functions
Add a new config RING_BUFFER_RECORD_RECURSION that will place functions that
recurse from the ring buffer into the ftrace recused_functions file.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/Kconfig')
| -rw-r--r-- | kernel/trace/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 9b11c096d139..6aa36ec73ccb 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -752,6 +752,20 @@ config FTRACE_RECORD_RECURSION_SIZE This file can be reset, but the limit can not change in size at runtime. +config RING_BUFFER_RECORD_RECURSION + bool "Record functions that recurse in the ring buffer" + depends on FTRACE_RECORD_RECURSION + # default y, because it is coupled with FTRACE_RECORD_RECURSION + default y + help + The ring buffer has its own internal recursion. Although when + recursion happens it wont cause harm because of the protection, + but it does cause an unwanted overhead. Enabling this option will + place where recursion was detected into the ftrace "recursed_functions" + file. + + This will add more overhead to cases that have recursion. + config GCOV_PROFILE_FTRACE bool "Enable GCOV profiling on ftrace subsystem" depends on GCOV_KERNEL |