linux-kernel - Re: [RFC PATCH 3/5] libbpf, bpftool: Support BPF_PROG_TYPE_OOM

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Date:   Fri, 28 Jul 2023 11:01:23 +0800
From:   Chuyi Zhou <zhouchuyi@...edance.com>
To:     Quentin Monnet <quentin@...valent.com>, hannes@...xchg.org,
        mhocko@...nel.org, roman.gushchin@...ux.dev, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        wuyun.abel@...edance.com, robin.lu@...edance.com
Subject: Re: [RFC PATCH 3/5] libbpf, bpftool: Support BPF_PROG_TYPE_OOM_POLICY

Hi,

在 2023/7/27 20:26, Quentin Monnet 写道:
> 2023-07-27 15:36 UTC+0800 ~ Chuyi Zhou <zhouchuyi@...edance.com>
>> Support BPF_PROG_TYPE_OOM_POLICY program in libbpf and bpftool, so that
>> we can identify and use BPF_PROG_TYPE_OOM_POLICY in our application.
>>
>> Signed-off-by: Chuyi Zhou <zhouchuyi@...edance.com>
>> ---
>>   tools/bpf/bpftool/common.c     |  1 +
>>   tools/include/uapi/linux/bpf.h | 14 ++++++++++++++
>>   tools/lib/bpf/libbpf.c         |  3 +++
>>   tools/lib/bpf/libbpf_probes.c  |  2 ++
>>   4 files changed, 20 insertions(+)
>>
>> diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c
>> index cc6e6aae2447..c5c311299c4a 100644
>> --- a/tools/bpf/bpftool/common.c
>> +++ b/tools/bpf/bpftool/common.c
>> @@ -1089,6 +1089,7 @@ const char *bpf_attach_type_input_str(enum bpf_attach_type t)
>>   	case BPF_TRACE_FENTRY:			return "fentry";
>>   	case BPF_TRACE_FEXIT:			return "fexit";
>>   	case BPF_MODIFY_RETURN:			return "mod_ret";
>> +	case BPF_OOM_POLICY:			return "oom_policy";
> 
> This case is not necessary. This block is here to keep legacy attach
> type strings supported by bpftool. In your case, the name is the same as
> the one provided by libbpf, so...
> 
>>   	case BPF_SK_REUSEPORT_SELECT:		return "sk_skb_reuseport_select";
>>   	case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE:	return "sk_skb_reuseport_select_or_migrate";
>>   	default:	return libbpf_bpf_attach_type_str(t);
> 
> ... we just want to pick it up from libbpf directly, here.
> 
I see..

Thanks.

--
Chuyi Zhou
> [...]
> 
>> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
>> index 214f828ece6b..10496bb9b3bc 100644
>> --- a/tools/lib/bpf/libbpf.c
>> +++ b/tools/lib/bpf/libbpf.c
>> @@ -118,6 +118,7 @@ static const char * const attach_type_name[] = {
>>   	[BPF_TRACE_KPROBE_MULTI]	= "trace_kprobe_multi",
>>   	[BPF_STRUCT_OPS]		= "struct_ops",
>>   	[BPF_NETFILTER]			= "netfilter",
>> +	[BPF_OOM_POLICY]		= "oom_policy",
>>   };
>