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From: Jiri Olsa <jolsa@redhat.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: "Jiri Olsa" <jolsa@kernel.org>,
	"Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	netdev@vger.kernel.org, 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>
Subject: Re: [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms
Date: Wed, 12 Feb 2020 11:46:47 +0100
Message-ID: <20200212104647.GB183981@krava> (raw)
In-Reply-To: <20200211191347.GH3416@kernel.org>

On Tue, Feb 11, 2020 at 04:13:47PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sat, Feb 08, 2020 at 04:41:55PM +0100, Jiri Olsa escreveu:
> > hi,
> > this patchset adds trampoline and dispatcher objects
> > to be visible in /proc/kallsyms. The last patch also
> > adds sorting for all bpf objects in /proc/kallsyms.
> 
> This will allow those to appear in profiles, right? That would be

yea, one would think so.. but as you saw in the other email
there are still some issues ;-)

> interesting to explicitely state, i.e. the _why_ of this patch, not just
> the _what_.

I guess another reason would be accountability of the kernel space,
so that everything with the symbol would appear in /proc/kallsyms

jirka

> 
> Thanks,
> 
> - Arnaldo
>  
> >   $ sudo cat /proc/kallsyms | tail -20
> >   ...
> >   ffffffffa050f000 t bpf_prog_5a2b06eab81b8f51    [bpf]
> >   ffffffffa0511000 t bpf_prog_6deef7357e7b4530    [bpf]
> >   ffffffffa0542000 t bpf_trampoline_13832 [bpf]
> >   ffffffffa0548000 t bpf_prog_96f1b5bf4e4cc6dc_mutex_lock [bpf]
> >   ffffffffa0572000 t bpf_prog_d1c63e29ad82c4ab_bpf_prog1  [bpf]
> >   ffffffffa0585000 t bpf_prog_e314084d332a5338__dissect   [bpf]
> >   ffffffffa0587000 t bpf_prog_59785a79eac7e5d2_mutex_unlock       [bpf]
> >   ffffffffa0589000 t bpf_prog_d0db6e0cac050163_mutex_lock [bpf]
> >   ffffffffa058d000 t bpf_prog_d8f047721e4d8321_bpf_prog2  [bpf]
> >   ffffffffa05df000 t bpf_trampoline_25637 [bpf]
> >   ffffffffa05e3000 t bpf_prog_d8f047721e4d8321_bpf_prog2  [bpf]
> >   ffffffffa05e5000 t bpf_prog_3b185187f1855c4c    [bpf]
> >   ffffffffa05e7000 t bpf_prog_d8f047721e4d8321_bpf_prog2  [bpf]
> >   ffffffffa05eb000 t bpf_prog_93cebb259dd5c4b2_do_sys_open        [bpf]
> >   ffffffffa0677000 t bpf_dispatcher_xdp   [bpf]
> > 
> > thanks,
> > jirka
> > 
> > 
> > ---
> > Björn Töpel (1):
> >       bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER
> > 
> > Jiri Olsa (13):
> >       x86/mm: Rename is_kernel_text to __is_kernel_text
> >       bpf: Add struct bpf_ksym
> >       bpf: Add name to struct bpf_ksym
> >       bpf: Add lnode list node to struct bpf_ksym
> >       bpf: Add bpf_kallsyms_tree tree
> >       bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del
> >       bpf: Separate kallsyms add/del functions
> >       bpf: Add bpf_ksym_add/del functions
> >       bpf: Re-initialize lnode in bpf_ksym_del
> >       bpf: Rename bpf_tree to bpf_progs_tree
> >       bpf: Add trampolines to kallsyms
> >       bpf: Add dispatchers to kallsyms
> >       bpf: Sort bpf kallsyms symbols
> > 
> >  arch/x86/mm/init_32.c   |  14 ++++++----
> >  include/linux/bpf.h     |  54 ++++++++++++++++++++++++++------------
> >  include/linux/filter.h  |  13 +++-------
> >  kernel/bpf/core.c       | 182 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------------------------
> >  kernel/bpf/dispatcher.c |   6 +++++
> >  kernel/bpf/trampoline.c |  23 ++++++++++++++++
> >  kernel/events/core.c    |   4 +--
> >  net/core/filter.c       |   5 ++--
> >  8 files changed, 219 insertions(+), 82 deletions(-)
> > 
> 
> -- 
> 
> - Arnaldo
> 


      reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-08 15:41 Jiri Olsa
2020-02-08 15:41 ` [PATCH 01/14] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-02-08 15:41 ` [PATCH 02/14] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-02-08 15:41 ` [PATCH 03/14] bpf: Add struct bpf_ksym Jiri Olsa
2020-02-08 15:41 ` [PATCH 04/14] bpf: Add name to " Jiri Olsa
2020-02-08 15:42 ` [PATCH 05/14] bpf: Add lnode list node " Jiri Olsa
2020-02-08 15:42 ` [PATCH 06/14] bpf: Add bpf_kallsyms_tree tree Jiri Olsa
2020-02-11 18:21   ` Andrii Nakryiko
2020-02-12 10:49     ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 07/14] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-02-08 15:42 ` [PATCH 08/14] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 09/14] bpf: Add bpf_ksym_add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 10/14] bpf: Re-initialize lnode in bpf_ksym_del Jiri Olsa
2020-02-11 18:28   ` Andrii Nakryiko
2020-02-12 10:43     ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 11/14] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-02-08 15:42 ` [PATCH 12/14] bpf: Add trampolines to kallsyms Jiri Olsa
2020-02-11 18:51   ` Andrii Nakryiko
2020-02-12 11:10     ` Jiri Olsa
2020-02-12 16:33       ` Andrii Nakryiko
2020-02-12 22:58         ` Jiri Olsa
2020-02-12 23:02         ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 13/14] bpf: Add dispatchers " Jiri Olsa
2020-02-11 19:03   ` Andrii Nakryiko
2020-02-12 10:52     ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 14/14] bpf: Sort bpf kallsyms symbols Jiri Olsa
2020-02-11 19:12   ` Andrii Nakryiko
2020-02-10 15:51 ` [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Björn Töpel
2020-02-10 16:17   ` Jiri Olsa
2020-02-11 19:32     ` Arnaldo Carvalho de Melo
2020-02-12 11:13       ` Jiri Olsa
2020-02-12 13:31         ` Arnaldo Carvalho de Melo
2020-02-12 22:40           ` Jiri Olsa
2020-02-13 16:23   ` Jiri Olsa
2020-02-11 19:13 ` Arnaldo Carvalho de Melo
2020-02-12 10:46   ` Jiri Olsa [this message]

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