On Fri, 10 Jul 2020 15:38:38 +0200 Peter Zijlstra <[email protected]> wrote:
> From: Josh Poimboeuf <[email protected]> > > Add infrastructure for an arch-specific CONFIG_HAVE_STATIC_CALL_INLINE > option, which is a faster version of CONFIG_HAVE_STATIC_CALL. At > runtime, the static call sites are patched directly, rather than using > the out-of-line trampolines. > > Compared to out-of-line static calls, the performance benefits are more > modest, but still measurable. Steven Rostedt did some tracepoint > measurements: > > https://lkml.kernel.org/r/[email protected] > > This code is heavily inspired by the jump label code (aka "static > jumps"), as some of the concepts are very similar. > > For more details, see the comments in include/linux/static_call.h. > > [peterz: simplified interface; merged trampolines] > Signed-off-by: Josh Poimboeuf <[email protected]> > Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Reviewed-by: Steven Rostedt (VMware) <[email protected]> -- Steve > --- > arch/Kconfig | 4 > include/asm-generic/vmlinux.lds.h | 7 > include/linux/module.h | 5 > include/linux/static_call.h | 36 ++++ > include/linux/static_call_types.h | 13 + > kernel/Makefile | 1 > kernel/module.c | 5 > kernel/static_call.c | 303 > ++++++++++++++++++++++++++++++++++++++ > 8 files changed, 373 insertions(+), 1 deletion(-) > create mode 100644 kernel/static_call.c
