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| author |   Josh Poimboeuf <jpoimboe@redhat.com> | 2016-08-19 06:52:56 -0500 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2016-08-24 12:15:14 +0200 |
| commit | daa460a88c09b26b68e8b017de589c217e901afb (patch) | |
| tree | d57e0a053fac1bc06cfd29194bc578bc5b68d88c /include/linux/ftrace.h | |
| parent | ftrace: Remove CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST from config (diff) | |
| download | linux-dev-daa460a88c09b26b68e8b017de589c217e901afb.tar.xz linux-dev-daa460a88c09b26b68e8b017de589c217e901afb.zip | |
ftrace: Only allocate the ret_stack 'fp' field when needed
This saves some memory when HAVE_FUNCTION_GRAPH_FP_TEST isn't defined.
On x86_64 with newer versions of gcc which have -mfentry, it saves 400
bytes per task.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5c7747d9ea7b5cb47ef0a8ce8a6cea6bf7aa94bf.1471607358.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/ftrace.h')
| -rw-r--r-- | include/linux/ftrace.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 7d565afe35d2..4ad9ccc60e38 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -795,7 +795,9 @@ struct ftrace_ret_stack { unsigned long func; unsigned long long calltime; unsigned long long subtime; +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST unsigned long fp; +#endif }; /* |