From: Namhyung Kim <namhyung@kernel.org>
To: "Wangnan (F)" <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>,
acme@kernel.org, brendan.d.gregg@gmail.com, daniel@iogearbox.net,
masami.hiramatsu.pt@hitachi.com, paulus@samba.org,
a.p.zijlstra@chello.nl, mingo@redhat.com, jolsa@kernel.org,
dsahern@gmail.com, linux-kernel@vger.kernel.org,
lizefan@huawei.com, hekuang@huawei.com, xiakaixu@huawei.com,
pi3orama@163.com
Subject: Re: [RFC PATCH v6 25/32] perf tools: Add 'bpf.' config section to perf default config
Date: Thu, 11 Jun 2015 23:50:40 +0900 [thread overview]
Message-ID: <20150611145040.GC31117@danjae.kornet> (raw)
In-Reply-To: <55794240.7060009@huawei.com>
On Thu, Jun 11, 2015 at 04:09:36PM +0800, Wangnan (F) wrote:
> On 2015/6/11 15:45, Namhyung Kim wrote:
> >On Tue, Jun 09, 2015 at 04:43:19PM -0700, Alexei Starovoitov wrote:
> >>On 6/8/15 10:50 PM, Wang Nan wrote:
> >>>perf_bpf_config() is added to parse 'bpf' section in perf config file.
> >>>Following is an example:
> >>>
> >>> [bpf]
> >>> clang-path = /llvm/bin/x86_64-linux-clang"
> >>> llc-path = /llvm/bin/x86_64-linux-llc"
> >>> clang-opt = "-nostdinc -isystem /llvm/lib/clang/include -I/kernel/arch/x86/include ..."
> >>> llc-opt = ""
> >>a section to specify -I flags to compile prog.c is useful,
> >>but users shouldn't be populating it manually for kernel headers.
> >>How about adding a script that can figure out $(LINUXINCLUDE)
> >>automatically ?
> >Maybe a dummy question. For what reason it needs such headers? Is it
> >possible to have a (part of?) copy of needed bits in the perf source?
> >
> >Thanks,
> >Namhyung
>
> It is improtant for eBPF script that it should be able to extract
> information
> from kernel pointers. For example: to extract registers from 'struct
> pt_regs' and
> to extract fields from 'struct page *'. I believe this is an improtant
> reason
> why we decide to use C-like language instead of designing a DLS. Therefore,
> when
> compiling .c to .o, kernel source is mandatory. Since we don't want to limit
> the
> ability of data accessing of eBPF scripts, we have to give it ability to
> access all
> kernel headers.
Understood, thank you for the explanation!
Namhyung
next prev parent reply other threads:[~2015-06-11 14:52 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-09 5:50 [RFC PATCH v6 00/32] perf tools: filtering events using eBPF programs Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 01/32] tools build: Add feature check for eBPF API Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 02/32] bpf tools: Introduce 'bpf' library to tools Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 03/32] bpf tools: Allow caller to set printing function Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 04/32] bpf tools: Open eBPF object file and do basic validation Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 05/32] bpf tools: Read eBPF object from buffer Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 06/32] bpf tools: Check endianess and make libbpf fail early Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 07/32] bpf tools: Iterate over ELF sections to collect information Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 08/32] bpf tools: Collect version and license from ELF sections Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 09/32] bpf tools: Collect map definitions from 'maps' section Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 10/32] bpf tools: Collect symbol table from SHT_SYMTAB section Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 11/32] bpf tools: Collect eBPF programs from their own sections Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 12/32] bpf tools: Collect relocation sections from SHT_REL sections Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 13/32] bpf tools: Record map accessing instructions for each program Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 14/32] bpf tools: Add bpf.c/h for common bpf operations Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 15/32] bpf tools: Create eBPF maps defined in an object file Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 16/32] bpf tools: Relocate eBPF programs Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 17/32] bpf tools: Introduce bpf_load_program() to bpf.c Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 18/32] bpf tools: Load eBPF programs in object files into kernel Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 19/32] bpf tools: Introduce accessors for struct bpf_program Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 20/32] bpf tools: Introduce accessors for struct bpf_object Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 21/32] bpf tools: Link all bpf objects onto a list Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 22/32] perf tools: Make perf depend on libbpf Wang Nan
2015-06-09 10:29 ` Wangnan (F)
2015-06-09 5:50 ` [RFC PATCH v6 23/32] perf record: Enable passing bpf object file to --event Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 24/32] perf record: Compile scriptlets if pass '.c' " Wang Nan
2015-06-09 21:48 ` Alexei Starovoitov
2015-06-10 0:06 ` Wangnan (F)
2015-06-10 0:28 ` Alexei Starovoitov
2015-06-11 7:19 ` Namhyung Kim
2015-06-11 7:35 ` Wangnan (F)
2015-06-11 17:42 ` Alexei Starovoitov
2015-06-09 5:50 ` [RFC PATCH v6 25/32] perf tools: Add 'bpf.' config section to perf default config Wang Nan
2015-06-09 23:43 ` Alexei Starovoitov
2015-06-10 0:47 ` Wangnan (F)
2015-06-10 1:09 ` Alexei Starovoitov
2015-06-10 2:23 ` Wangnan (F)
2015-06-10 3:55 ` Alexei Starovoitov
2015-06-11 7:45 ` Namhyung Kim
2015-06-11 8:09 ` Wangnan (F)
2015-06-11 14:50 ` Namhyung Kim [this message]
2015-06-09 5:50 ` [RFC PATCH v6 26/32] perf tools: Parse probe points of eBPF programs during preparation Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 27/32] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 28/32] perf record: Probe at kprobe points Wang Nan
2015-06-11 14:32 ` Namhyung Kim
2015-06-09 5:50 ` [RFC PATCH v6 29/32] perf record: Load all eBPF object into kernel Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 30/32] perf tools: Add bpf_fd field to evsel and config it Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 31/32] perf tools: Attach eBPF program to perf event Wang Nan
2015-06-09 5:50 ` [RFC PATCH v6 32/32] perf record: Add LLVM options for compiling BPF scripts Wang Nan
2015-06-09 13:32 ` Wangnan (F)
2015-06-10 0:02 ` Alexei Starovoitov
2015-06-10 0:17 ` Wangnan (F)
2015-06-10 1:34 ` Alexei Starovoitov
2015-06-09 13:59 ` [RFC PATCH v6 00/32] perf tools: filtering events using eBPF programs Arnaldo Carvalho de Melo
2015-06-09 23:45 ` Wangnan (F)
2015-06-09 21:30 ` Alexei Starovoitov
2015-06-09 21:44 ` Arnaldo Carvalho de Melo
2015-06-09 23:16 ` Alexei Starovoitov
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