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Date:   Tue, 1 Sep 2020 22:45:29 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com,
        daniel@...earbox.net, andrii.nakryiko@...il.com, kernel-team@...com
Subject: Re: [PATCH v2 bpf-next 12/14] selftests/bpf: convert pyperf,
 strobemeta, and l4lb_noinline to __noinline

On Mon, Aug 31, 2020 at 06:50:01PM -0700, Andrii Nakryiko wrote:
> diff --git a/tools/testing/selftests/bpf/progs/pyperf.h b/tools/testing/selftests/bpf/progs/pyperf.h
> index cc615b82b56e..13998aee887f 100644
> --- a/tools/testing/selftests/bpf/progs/pyperf.h
> +++ b/tools/testing/selftests/bpf/progs/pyperf.h
> @@ -67,7 +67,7 @@ typedef struct {
>  	void* co_name; // PyCodeObject.co_name
>  } FrameData;
>  
> -static __always_inline void *get_thread_state(void *tls_base, PidData *pidData)
> +static __noinline void *get_thread_state(void *tls_base, PidData *pidData)
>  {
>  	void* thread_state;
>  	int key;
> @@ -154,12 +154,10 @@ struct {
>  	__uint(value_size, sizeof(long long) * 127);
>  } stackmap SEC(".maps");
>  
> -#ifdef GLOBAL_FUNC
> -__attribute__((noinline))
> -#else
> -static __always_inline
> +#ifndef GLOBAL_FUNC
> +static
>  #endif
> -int __on_event(struct bpf_raw_tracepoint_args *ctx)
> +__noinline int __on_event(struct bpf_raw_tracepoint_args *ctx)
>  {
>  	uint64_t pid_tgid = bpf_get_current_pid_tgid();
>  	pid_t pid = (pid_t)(pid_tgid >> 32);
> diff --git a/tools/testing/selftests/bpf/progs/strobemeta.h b/tools/testing/selftests/bpf/progs/strobemeta.h
> index ad61b722a9de..d307c67ce52e 100644
> --- a/tools/testing/selftests/bpf/progs/strobemeta.h
> +++ b/tools/testing/selftests/bpf/progs/strobemeta.h
> @@ -266,8 +266,7 @@ struct tls_index {
>  	uint64_t offset;
>  };
>  
> -static __always_inline void *calc_location(struct strobe_value_loc *loc,
> -					   void *tls_base)
> +static __noinline void *calc_location(struct strobe_value_loc *loc, void *tls_base)

hmm. this reduces the existing test coverage. Unless I'm misreading it.
Could you keep existing strobemta tests and add new one?
With new ifdefs. Like this GLOBAL_FUNC.

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