From: Jiri Olsa <jolsa@redhat.com>
To: Song Liu <song@kernel.org>
Cc: "Jiri Olsa" <jolsa@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
"Andrii Nakryiko" <andriin@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Song Liu" <songliubraving@fb.com>,
"Martin KaFai Lau" <kafai@fb.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David Miller" <davem@redhat.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"Arnaldo Carvalho de Melo" <acme@redhat.com>
Subject: Re: [PATCH 04/18] bpf: Add name to struct bpf_ksym
Date: Thu, 27 Feb 2020 09:50:02 +0100 [thread overview]
Message-ID: <20200227085002.GC34774@krava> (raw)
In-Reply-To: <CAPhsuW5u=6MEWKU4-Cfdr3VfYn+NuTgX6SezC_W33WZsM3j8ng@mail.gmail.com>
On Wed, Feb 26, 2020 at 01:14:43PM -0800, Song Liu wrote:
> On Wed, Feb 26, 2020 at 5:04 AM Jiri Olsa <jolsa@kernel.org> wrote:
> >
> > Adding name to 'struct bpf_ksym' object to carry the name
> > of the symbol for bpf_prog, bpf_trampoline, bpf_dispatcher.
> >
> > The current benefit is that name is now generated only when
> > the symbol is added to the list, so we don't need to generate
> > it every time it's accessed.
> >
> > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
>
> The patch looks good. But I wonder whether we want pay the cost of
> extra 128 bytes per bpf program. Maybe make it a pointer and only
> generate the string when it is first used?
I thought 128 would not be that bad, also the code is quite
simple because of that.. if that's really a concern I could
make the changes, but that would probably mean changing the
design
jirka
next prev parent reply other threads:[~2020-02-27 8:50 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 13:03 [PATCHv3 00/18] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-02-26 13:03 ` [PATCH 01/18] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-02-26 18:44 ` Song Liu
2020-02-26 13:03 ` [PATCH 02/18] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-02-26 18:54 ` Song Liu
2020-02-26 13:03 ` [PATCH 03/18] bpf: Add struct bpf_ksym Jiri Olsa
2020-02-26 19:01 ` Song Liu
2020-02-26 13:03 ` [PATCH 04/18] bpf: Add name to " Jiri Olsa
2020-02-26 21:14 ` Song Liu
2020-02-27 8:50 ` Jiri Olsa [this message]
2020-02-27 18:59 ` Song Liu
2020-03-01 18:31 ` Jiri Olsa
2020-02-26 13:03 ` [PATCH 05/18] bpf: Add lnode list node " Jiri Olsa
2020-02-26 22:51 ` Song Liu
2020-02-27 8:15 ` Jiri Olsa
2020-02-26 13:03 ` [PATCH 06/18] bpf: Add bpf_ksym_tree tree Jiri Olsa
2020-02-26 23:10 ` Song Liu
2020-02-26 13:03 ` [PATCH 07/18] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-02-26 23:12 ` Song Liu
2020-02-26 13:03 ` [PATCH 08/18] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-02-26 23:14 ` Song Liu
2020-02-26 13:03 ` [PATCH 09/18] bpf: Add bpf_ksym_add/del functions Jiri Olsa
2020-02-26 23:16 ` Song Liu
2020-02-26 13:03 ` [PATCH 10/18] bpf: Re-initialize lnode in bpf_ksym_del Jiri Olsa
2020-02-26 23:21 ` Song Liu
2020-02-27 19:50 ` Alexei Starovoitov
2020-02-28 12:17 ` Jiri Olsa
2020-02-28 13:18 ` Arnaldo Carvalho de Melo
2020-02-28 13:16 ` Arnaldo Carvalho de Melo
2020-02-26 13:03 ` [PATCH 11/18] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-02-26 23:22 ` Song Liu
2020-02-26 13:03 ` [PATCH 12/18] bpf: Add trampolines to kallsyms Jiri Olsa
2020-02-26 23:36 ` Song Liu
2020-02-27 6:26 ` Martin KaFai Lau
2020-02-27 8:08 ` Jiri Olsa
2020-02-26 13:03 ` [PATCH 13/18] bpf: Return error value in bpf_dispatcher_update Jiri Olsa
2020-02-26 23:45 ` Song Liu
2020-02-26 13:03 ` [PATCH 14/18] bpf: Add dispatchers to kallsyms Jiri Olsa
2020-02-26 23:48 ` Song Liu
2020-02-26 13:03 ` [PATCH 15/18] bpf: Sort bpf kallsyms symbols Jiri Olsa
2020-02-26 23:57 ` Song Liu
2020-02-26 13:03 ` [PATCH 16/18] perf tools: Synthesize bpf_trampoline/dispatcher ksymbol event Jiri Olsa
2020-02-27 5:50 ` Song Liu
2020-02-28 13:14 ` Arnaldo Carvalho de Melo
2020-02-26 13:03 ` [PATCH 17/18] perf tools: Set ksymbol dso as loaded on arrival Jiri Olsa
2020-02-27 5:52 ` Song Liu
2020-02-28 13:15 ` Arnaldo Carvalho de Melo
2020-02-26 13:03 ` [PATCH 18/18] perf annotate: Add base support for bpf_image Jiri Olsa
2020-02-27 5:54 ` Song Liu
2020-02-28 13:16 ` Arnaldo Carvalho de Melo
-- strict thread matches above, loose matches on Subject: below --
2020-02-16 19:29 [PATCHv2 00/18] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-02-16 19:29 ` [PATCH 04/18] bpf: Add name to struct bpf_ksym Jiri Olsa
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