linux-kernel - Re: [PATCH v3 linux-trace 1/8] tracing: attach eBPF programs to tracepoints and syscalls

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Message-ID: <54E1D3F6.3040500@huawei.com>
Date:	Mon, 16 Feb 2015 19:26:46 +0800
From:	He Kuang <hekuang@...wei.com>
To:	Alexei Starovoitov <ast@...mgrid.com>,
	Steven Rostedt <rostedt@...dmis.org>
CC:	Ingo Molnar <mingo@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Linux API <linux-api@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, <wangnan0@...wei.com>
Subject: Re: [PATCH v3 linux-trace 1/8] tracing: attach eBPF programs to tracepoints
 and syscalls

Hi, Alexei

Another suggestion on bpf syscall interface. Currently, BPF +
syscalls/kprobes depends on CONFIG_BPF_SYSCALL. In kernel used on
commercial products, CONFIG_BPF_SYSCALL is probably disabled, in this
case, bpf bytecode cannot be loaded to the kernel.

If we turn the functionality of BPF_SYSCALL into a loadable module, then
we can use it without any dependencies on the kernel. What about change
bpf syscall to a /dev node or /sys file which can be exported by a
kernel module?

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