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selftests/bpf: add realistic loop tests

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Add a bunch of loop tests. Most of them are created by replacing
'#pragma unroll' with '#pragma clang loop unroll(disable)'

Several tests are artificially large:
  /* partial unroll. llvm will unroll loop ~150 times.
   * C loop count -> 600.
   * Asm loop count -> 4.
   * 16k insns in loop body.
   * Total of 5 such loops. Total program size ~82k insns.
   */
  "./pyperf600.o",

  /* no unroll at all.
   * C loop count -> 600.
   * ASM loop count -> 600.
   * ~110 insns in loop body.
   * Total of 5 such loops. Total program size ~1500 insns.
   */
  "./pyperf600_nounroll.o",

  /* partial unroll. 19k insn in a loop.
   * Total program size 20.8k insn.
   * ~350k processed_insns
   */
  "./strobemeta.o",

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov
2019-06-15 12:12:24 -07:00
committed by Daniel Borkmann
parent 0d3679e99a
commit b061017f8b
15 changed files with 1347 additions and 12 deletions
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6
tools/testing/selftests/bpf/progs/pyperf.h
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@@ -220,7 +220,11 @@ static inline __attribute__((__always_inline__)) int __on_event(struct pt_regs *
int32_t* symbol_counter = bpf_map_lookup_elem(&symbolmap, &sym);
if (symbol_counter == NULL)
return 0;
#pragma unroll
#ifdef NO_UNROLL
#pragma clang loop unroll(disable)
#else
#pragma clang loop unroll(full)
#endif
/* Unwind python stack */
for (int i = 0; i < STACK_MAX_LEN; ++i) {
if (frame_ptr && get_frame_data(frame_ptr, pidData, &frame, &sym)) {