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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2020-11-05 21:32:46 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2020-11-06 08:42:26 -0500
commit773c16705058e9be7b0f4ce124e89cd231c120a2 (patch)
tree30bbb7933a0b1bc835d64cd6d61ca8e9b87f8eb7 /kernel/trace/Kconfig
parenta25d036d939a30623ff73ecad9c8b9116b02e823 (diff)
ftrace: Add recording of functions that caused recursion
This adds CONFIG_FTRACE_RECORD_RECURSION that will record to a file "recursed_functions" all the functions that caused recursion while a callback to the function tracer was running. Link: https://lkml.kernel.org/r/20201106023548.102375687@goodmis.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Guo Ren <guoren@kernel.org> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: x86@kernel.org Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Anton Vorontsov <anton@enomsg.org> Cc: Colin Cross <ccross@android.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: Miroslav Benes <mbenes@suse.cz> Cc: Petr Mladek <pmladek@suse.com> Cc: Joe Lawrence <joe.lawrence@redhat.com> Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-csky@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: live-patching@vger.kernel.org Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/Kconfig')
-rw-r--r--kernel/trace/Kconfig25
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index a4020c0b4508..9b11c096d139 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -727,6 +727,31 @@ config TRACE_EVAL_MAP_FILE
If unsure, say N.
+config FTRACE_RECORD_RECURSION
+ bool "Record functions that recurse in function tracing"
+ depends on FUNCTION_TRACER
+ help
+ All callbacks that attach to the function tracing have some sort
+ of protection against recursion. Even though the protection exists,
+ it adds overhead. This option will create a file in the tracefs
+ file system called "recursed_functions" that will list the functions
+ that triggered a recursion.
+
+ This will add more overhead to cases that have recursion.
+
+ If unsure, say N
+
+config FTRACE_RECORD_RECURSION_SIZE
+ int "Max number of recursed functions to record"
+ default 128
+ depends on FTRACE_RECORD_RECURSION
+ help
+ This defines the limit of number of functions that can be
+ listed in the "recursed_functions" file, that lists all
+ the functions that caused a recursion to happen.
+ This file can be reset, but the limit can not change in
+ size at runtime.
+
config GCOV_PROFILE_FTRACE
bool "Enable GCOV profiling on ftrace subsystem"
depends on GCOV_KERNEL