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selftests: Add benchmark for syscall user dispatch

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This is the patch I'm using to evaluate the impact syscall user dispatch
has on native syscall (syscalls not redirected to userspace) when
enabled for the process and submiting syscalls though the unblocked
dispatch selector. It works by running a step to define a baseline of
the cost of executing sysinfo, then enabling SUD, and rerunning that
step.

On my test machine, an AMD Ryzen 5 1500X, I have the following results
with the latest version of syscall user dispatch patches.

root@olga:~# syscall_user_dispatch/sud_benchmark
  Calibrating test set to last ~5 seconds...
  test iterations = 37500000
  Avg syscall time 134ns.
  Caught sys_ff00
  trapped_call_count 1, native_call_count 0.
  Avg syscall time 147ns.
  Interception overhead: 9.7% (+13ns).

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20201127193238.821364-7-krisman@collabora.com
This commit is contained in:
Gabriel Krisman Bertazi
2020-11-27 14:32:37 -05:00
committed by Thomas Gleixner
parent 179ef03599
commit d87ae0fa21
2 changed files with 201 additions and 1 deletions
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2
tools/testing/selftests/syscall_user_dispatch/Makefile
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@@ -5,5 +5,5 @@ LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/
CFLAGS += -Wall -I$(LINUX_HDR_PATH)
TEST_GEN_PROGS := sud_test
TEST_GEN_PROGS := sud_test sud_benchmark
include ../lib.mk