From: Simon Horman <simon.horman@corigine.com>
To: menglong8.dong@gmail.com
Cc: olsajiri@gmail.com, davem@davemloft.net, dsahern@kernel.org,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
haoluo@google.com, jolsa@kernel.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com,
shuah@kernel.org, benbjiang@tencent.com, iii@linux.ibm.com,
imagedong@tencent.com, xukuohai@huawei.com, chantr4@gmail.com,
zwisler@google.com, eddyz87@gmail.com, netdev@vger.kernel.org,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH bpf-next v2 1/5] bpf: make MAX_BPF_FUNC_ARGS 14
Date: Sat, 3 Jun 2023 16:13:43 +0200 [thread overview]
Message-ID: <ZHtKl8UE3AmJ3OpH@corigine.com> (raw)
In-Reply-To: <20230602065958.2869555-2-imagedong@tencent.com>
On Fri, Jun 02, 2023 at 02:59:54PM +0800, menglong8.dong@gmail.com wrote:
> From: Menglong Dong <imagedong@tencent.com>
>
> According to the current kernel version, below is a statistics of the
> function arguments count:
>
> argument count | FUNC_PROTO count
> 7 | 367
> 8 | 196
> 9 | 71
> 10 | 43
> 11 | 22
> 12 | 10
> 13 | 15
> 14 | 4
> 15 | 0
> 16 | 1
>
> It's hard to statisics the function count, so I use FUNC_PROTO in the btf
> of vmlinux instead. The function with 16 arguments is ZSTD_buildCTable(),
> which I think can be ignored.
>
> Therefore, let's make the maximum of function arguments count 14. It used
> to be 12, but it seems that there is no harm to make it big enough.
>
> Reviewed-by: Jiang Biao <benbjiang@tencent.com>
> Signed-off-by: Menglong Dong <imagedong@tencent.com>
> ---
> include/linux/bpf.h | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index f58895830ada..8b997779faf7 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -961,10 +961,10 @@ enum bpf_cgroup_storage_type {
>
> #define MAX_BPF_CGROUP_STORAGE_TYPE __BPF_CGROUP_STORAGE_MAX
>
> -/* The longest tracepoint has 12 args.
> - * See include/trace/bpf_probe.h
> +/* The maximun number of the kernel function arguments.
Hi Menglong Dong,
as it looks like there will be a v3 anyway, please
consider correcting the spelling of maximum.
...
next prev parent reply other threads:[~2023-06-03 14:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-02 6:59 [PATCH bpf-next v2 0/5] bpf, x86: allow function arguments up to 14 for TRACING menglong8.dong
2023-06-02 6:59 ` [PATCH bpf-next v2 1/5] bpf: make MAX_BPF_FUNC_ARGS 14 menglong8.dong
2023-06-02 18:17 ` Alexei Starovoitov
2023-06-05 2:49 ` Menglong Dong
2023-06-03 14:13 ` Simon Horman [this message]
2023-06-05 2:54 ` Menglong Dong
2023-06-02 6:59 ` [PATCH bpf-next v2 2/5] bpf, x86: allow function arguments up to 14 for TRACING menglong8.dong
2023-06-02 7:40 ` Menglong Dong
2023-06-02 18:31 ` Alexei Starovoitov
2023-06-05 2:40 ` Menglong Dong
2023-06-05 20:10 ` Jiri Olsa
2023-06-06 2:02 ` Menglong Dong
2023-06-02 6:59 ` [PATCH bpf-next v2 3/5] libbpf: make BPF_PROG support 15 function arguments menglong8.dong
2023-06-02 6:59 ` [PATCH bpf-next v2 4/5] selftests/bpf: rename bpf_fentry_test{7,8,9} to bpf_fentry_test_ptr* menglong8.dong
2023-06-02 9:44 ` Menglong Dong
2023-06-02 6:59 ` [PATCH bpf-next v2 5/5] selftests/bpf: add testcase for FENTRY/FEXIT with 6+ arguments menglong8.dong
2023-06-02 8:24 ` Ilya Leoshkevich
2023-06-02 8:47 ` Menglong Dong
2023-06-02 18:32 ` Alexei Starovoitov
2023-06-05 2:55 ` Menglong Dong
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