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From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: "Wangnan (F)" <wangnan0@huawei.com>
Cc: "平松雅巳 / HIRAMATU，MASAMI" <masami.hiramatsu.pt@hitachi.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"He Kuang" <hekuang@huawei.com>,
	"Alexei Starovoitov" <ast@plumgrid.com>,
	"Brendan Gregg" <brendan.d.gregg@gmail.com>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"David Ahern" <dsahern@gmail.com>, "Jiri Olsa" <jolsa@kernel.org>,
	"Kaixu Xia" <xiakaixu@huawei.com>,
	"Namhyung Kim" <namhyung@kernel.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
	"Zefan Li" <lizefan@huawei.com>,
	"pi3orama@163.com" <pi3orama@163.com>
Subject: Re: [PATCH 23/31] perf tools: Introduce regs_query_register_offset() for x86
Date: Tue, 1 Sep 2015 11:50:12 -0300	[thread overview]
Message-ID: <20150901145012.GC29821@kernel.org> (raw)
In-Reply-To: <55E5AD9E.40802@huawei.com>

Em Tue, Sep 01, 2015 at 09:52:30PM +0800, Wangnan (F) escreveu:
> On 2015/9/1 19:47, 平松雅巳 / HIRAMATU，MASAMI wrote:
> >>From: Wang Nan [mailto:wangnan0@huawei.com]
> >>regs_query_register_offset() is a helper function which converts
> >>register name like "%rax" to offset of a register in 'struct pt_regs',
> >>which is required by BPF prologue generator. Since the function is
> >>identical, try to reuse the code in arch/x86/kernel/ptrace.c.

> >>Comment inside dwarf-regs.c list the differences between this
> >>implementation and kernel code.
> >Hmm, this also introduce a duplication of the code...
> >It might be a good time to move them into arch/x86/lib/ and
> >reuse it directly from perf code.
 
> So you want to move it from ./arch/x86/kernel/ptrace.c to arch/x86/lib and
> let perf link against arch/x86/lib/lib.a to use it?
 
> I think it worth a specific work to do it. Currently we lake
> scaffold to compile and link against the kernel side library. Moreover,
> we should also consider other archs. Seems not very easy.
 
> This is not the only one file which can benifite from kernel's arch/x86/lib
> Newly introduced tools/perf/util/intel-pt-decoder/insn.c, and I believe
> there's
> more. Therefore I think it should be a separated work from perf BPF patches.
> So how about keep this patch at this time? Or do you have some idea?

I would go with what Wang did at this time, its a step in the right
direction in the sense that we're trying to use the same function names
and semantics, and, as much as possible, possibly in verbatim form,
using the same implementation.

Doing the work to fully share it is something being discussed, but that
should not get in the way of eBPF work, IMHO.

- Arnaldo

  reply	other threads:[~2015-09-01 14:50 UTC|newest]

Thread overview: 94+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-29  4:21 [GIT PULL 00/31] perf tools: filtering events using eBPF programs Wang Nan
2015-08-29  4:21 ` [PATCH 01/31] bpf tools: New API to get name from a BPF object Wang Nan
2015-08-29  4:21 ` [PATCH 02/31] perf tools: Don't set cmdline_group_boundary if no evsel is collected Wang Nan
2015-08-31 19:20   ` Arnaldo Carvalho de Melo
2015-09-01 10:37     ` Wangnan (F)
2015-09-01 10:38     ` Jiri Olsa
2015-09-01 12:44       ` Wangnan (F)
2015-09-02  2:53   ` [PATCH] perf tools: Don't set leader if parser doesn't collect an evsel Wang Nan
2015-09-02  3:01     ` Wangnan (F)
2015-09-02  5:57     ` 平松雅巳 / HIRAMATU，MASAMI
2015-09-02  6:09       ` Wangnan (F)
     [not found]       ` <1441176553-116129-1-git-send-email-wangnan0@huawei.com>
2015-09-02  6:53         ` [PATCH] perf tools: Don't write to evsel if parser doesn't collect evsel Wangnan (F)
2015-09-02 10:31           ` 平松雅巳 / HIRAMATU，MASAMI
2015-09-02 11:54           ` Jiri Olsa
2015-09-02 12:05             ` pi3orama
2015-09-02 12:46               ` Jiri Olsa
2015-09-02 13:55               ` Arnaldo Carvalho de Melo
2015-09-02 14:04                 ` pi3orama
2015-09-02 14:43                   ` Arnaldo Carvalho de Melo
2015-09-02 22:24                     ` pi3orama
2015-08-29  4:21 ` [PATCH 03/31] perf tools: Introduce dummy evsel Wang Nan
2015-08-31 19:38   ` Arnaldo Carvalho de Melo
2015-09-03  0:11   ` Namhyung Kim
2015-09-03  0:42     ` pi3orama
2015-09-06  5:55   ` [PATCH] perf tools: Allow BPF placeholder dummy events to collect --filter options Wang Nan
2015-09-06  5:56     ` [PATCH] perf tools: Sync setting of real bpf events with placeholder Wang Nan
2015-08-29  4:21 ` [PATCH 04/31] perf tools: Make perf depend on libbpf Wang Nan
2015-08-29  4:21 ` [PATCH 05/31] perf ebpf: Add the libbpf glue Wang Nan
2015-08-29  4:21 ` [PATCH 06/31] perf tools: Enable passing bpf object file to --event Wang Nan
2015-08-29  4:21 ` [PATCH 07/31] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan
2015-09-02  4:32   ` Namhyung Kim
2015-09-02  5:40     ` Wangnan (F)
2015-08-29  4:21 ` [PATCH 08/31] perf record, bpf: Parse and probe eBPF programs probe points Wang Nan
2015-08-29  4:21 ` [PATCH 09/31] perf bpf: Collect 'struct perf_probe_event' for bpf_program Wang Nan
2015-08-29  4:21 ` [PATCH 10/31] perf record: Load all eBPF object into kernel Wang Nan
2015-08-29  4:21 ` [PATCH 11/31] perf tools: Add bpf_fd field to evsel and config it Wang Nan
2015-08-29  4:21 ` [PATCH 12/31] perf tools: Allow filter option to be applied to bof object Wang Nan
2015-08-29  4:21 ` [PATCH 13/31] perf tools: Attach eBPF program to perf event Wang Nan
2015-08-29  4:21 ` [PATCH 14/31] perf tools: Suppress probing messages when probing by BPF loading Wang Nan
2015-09-03  0:20   ` Namhyung Kim
2015-09-03  2:42     ` 平松雅巳 / HIRAMATU，MASAMI
2015-09-03 12:10     ` [PATCH perf/core ] perf-probe: Output the result of adding/deleting probe in buildin-probe Masami Hiramatsu
2015-09-03 12:18       ` 平松雅巳 / HIRAMATU，MASAMI
2015-09-03 17:25         ` Namhyung Kim
2015-09-03 20:28       ` Arnaldo Carvalho de Melo
2015-09-04  1:30         ` 平松雅巳 / HIRAMATU，MASAMI
2015-08-29  4:21 ` [PATCH 15/31] perf record: Add clang options for compiling BPF scripts Wang Nan
2015-08-29  4:21 ` [PATCH 16/31] perf tools: Infrastructure for compiling scriptlets when passing '.c' to --event Wang Nan
2015-08-29  4:21 ` [PATCH 17/31] perf tests: Enforce LLVM test for BPF test Wang Nan
2015-09-01  5:59   ` Wangnan (F)
2015-08-29  4:21 ` [PATCH 18/31] perf test: Add 'perf test BPF' Wang Nan
2015-09-02 12:45   ` Namhyung Kim
2015-09-05 12:21     ` Wang Nan
2015-08-29  4:21 ` [PATCH 19/31] bpf tools: Load a program with different instances using preprocessor Wang Nan
2015-08-29  4:21 ` [PATCH 20/31] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan
2015-08-29  4:21 ` [PATCH 21/31] perf tools: Move linux/filter.h to tools/include Wang Nan
2015-08-31 20:35   ` Arnaldo Carvalho de Melo
2015-09-01 19:39   ` Arnaldo Carvalho de Melo
2015-09-01 19:47     ` Arnaldo Carvalho de Melo
2015-09-01 21:08     ` pi3orama
2015-09-01 21:43       ` Arnaldo Carvalho de Melo
2015-09-08 14:31   ` [tip:perf/core] perf tools: Copy " tip-bot for He Kuang
2015-08-29  4:21 ` [PATCH 22/31] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan
2015-08-31 20:39   ` Arnaldo Carvalho de Melo
2015-09-01  6:59   ` Wang Nan
2015-09-01  6:59     ` [PATCH 23/31] perf tools: Introduce regs_query_register_offset() for x86 Wang Nan
2015-09-01 11:47       ` 平松雅巳 / HIRAMATU，MASAMI
2015-09-01 13:52         ` Wangnan (F)
2015-09-01 14:50           ` Arnaldo Carvalho de Melo [this message]
2015-09-01 14:14         ` Arnaldo Carvalho de Melo
2015-09-01 15:54           ` 平松雅巳 / HIRAMATU，MASAMI
2015-09-06  6:02             ` Wangnan (F)
2015-09-06  6:04               ` [PATCH] perf test: Enforce LLVM test, add kbuild test Wang Nan
2015-09-06  6:04                 ` [PATCH] perf test: Test BPF prologue Wang Nan
2015-09-02 14:08     ` [PATCH 22/31] perf tools: Add BPF_PROLOGUE config options for further patches Namhyung Kim
2015-08-29  4:21 ` [PATCH 23/31] perf tools: Introduce arch_get_reg_info() for x86 Wang Nan
2015-08-31 20:43   ` Arnaldo Carvalho de Melo
2015-09-01  2:39     ` Wangnan (F)
2015-08-29  4:21 ` [PATCH 24/31] perf tools: Add prologue for BPF programs for fetching arguments Wang Nan
2015-08-29  4:21 ` [PATCH 25/31] perf tools: Generate prologue for BPF programs Wang Nan
2015-08-29  4:22 ` [PATCH 26/31] perf tools: Use same BPF program if arguments are identical Wang Nan
2015-08-29  4:22 ` [PATCH 27/31] perf record: Support custom vmlinux path Wang Nan
2015-09-01 20:19   ` Arnaldo Carvalho de Melo
2015-09-01 20:21     ` Arnaldo Carvalho de Melo
2015-09-01 21:00       ` pi3orama
2015-09-01 21:33         ` Arnaldo Carvalho de Melo
2015-08-29  4:22 ` [PATCH 28/31] perf probe: Init symbol as kprobe Wang Nan
2015-09-01 20:11   ` Arnaldo Carvalho de Melo
2015-09-02  1:22     ` Wangnan (F)
2015-09-02  1:38     ` 平松雅巳 / HIRAMATU，MASAMI
2015-08-29  4:22 ` [PATCH 29/31] perf tools: Support attach BPF program on uprobe events Wang Nan
2015-08-29  4:22 ` [PATCH 30/31] perf tools: Fix cross compiling error Wang Nan
2015-08-29  4:22 ` [PATCH 31/31] tools lib traceevent: Support function __get_dynamic_array_len Wang Nan
2015-09-08 14:31   ` [tip:perf/core] " tip-bot for He Kuang

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