From: Song Liu <songliubraving@fb.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Netdev <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
Kernel Team <Kernel-team@fb.com>,
"Peter Zijlstra" <peterz@infradead.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>
Subject: Re: [PATCH v4 perf,bpf 07/15] perf, bpf: save bpf_prog_info information as headers to perf.data
Date: Wed, 27 Feb 2019 17:28:06 +0000 [thread overview]
Message-ID: <6D86D79B-6E72-4E42-86F8-41D1357229BF@fb.com> (raw)
In-Reply-To: <20190227132155.GI18893@krava>
> On Feb 27, 2019, at 5:21 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Mon, Feb 25, 2019 at 04:20:11PM -0800, Song Liu wrote:
>
> SNIP
>
>> + if (info_len > sizeof(struct bpf_prog_info)) {
>> + pr_warning("detected invalid bpf_prog_info\n");
>> + goto out;
>> + }
>> +
>> + info_linear = malloc(sizeof(struct bpf_prog_info_linear) +
>> + data_len);
>> + if (!info_linear)
>> + goto out;
>> + info_linear->info_len = sizeof(struct bpf_prog_info);
>> + info_linear->data_len = data_len;
>> + if (do_read_u64(ff, (u64 *)(&info_linear->arrays)))
>> + goto out;
>> + if (__do_read(ff, &info_linear->info, info_len))
>> + goto out;
>> + if (info_len < sizeof(struct bpf_prog_info))
>> + memset(((void *)(&info_linear->info)) + info_len, 0,
>> + sizeof(struct bpf_prog_info) - info_len);
>> +
>> + if (__do_read(ff, info_linear->data, data_len))
>> + goto out;
>> +
>> + /* endian mismatch, drop the info, continue */
>
> so there's no way we can swap the data? why?
>
> jirka
Yes, we can swap the data. OTOH, the set is big enough. How about we
implement the swap later? Running perf-report on a system of with
different endianness is a relatively rare case.
Thanks,
Song
>> + if (ff->ph->needs_swap) {
>> + free(info_linear);
>> + continue;
>> + }
>
> SNIP
next prev parent reply other threads:[~2019-02-27 17:29 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-26 0:20 [PATCH v4 perf,bpf 00/15] perf annotation of BPF programs Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 01/15] perf, bpf: consider events with attr.bpf_event as side-band events Song Liu
2019-03-09 19:46 ` [tip:perf/urgent] perf, bpf: Consider " tip-bot for Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 02/15] bpf: libbpf: introduce bpf_program__get_prog_info_linear() Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 03/15] bpf: bpftool: use bpf_program__get_prog_info_linear() in prog.c:do_dump() Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 04/15] perf, bpf: synthesize bpf events with bpf_program__get_prog_info_linear() Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 05/15] perf: change prototype of perf_event__synthesize_bpf_events() Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 06/15] perf, bpf: save bpf_prog_info in a rbtree in perf_env Song Liu
2019-02-27 13:21 ` Jiri Olsa
2019-02-27 17:38 ` Song Liu
2019-02-27 13:21 ` Jiri Olsa
2019-02-27 13:21 ` Jiri Olsa
2019-02-26 0:20 ` [PATCH v4 perf,bpf 07/15] perf, bpf: save bpf_prog_info information as headers to perf.data Song Liu
2019-02-27 13:21 ` Jiri Olsa
2019-02-27 17:28 ` Song Liu [this message]
2019-02-26 0:20 ` [PATCH v4 perf,bpf 08/15] perf, bpf: save btf in a rbtree in perf_env Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 09/15] perf, bpf: save btf information as headers to perf.data Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 10/15] perf-top: add option --no-bpf-event Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 12/15] perf, bpf: enable annotation of bpf program Song Liu
2019-02-27 13:21 ` Jiri Olsa
2019-02-27 13:22 ` Jiri Olsa
2019-02-26 0:20 ` [PATCH v4 perf,bpf 13/15] perf, bpf: process PERF_BPF_EVENT_PROG_LOAD for annotation Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 14/15] perf: introduce side band thread Song Liu
2019-02-27 13:21 ` Jiri Olsa
2019-02-27 17:52 ` Song Liu
2019-03-04 13:52 ` Jiri Olsa
2019-03-04 19:49 ` Song Liu
2019-03-04 20:41 ` Jiri Olsa
2019-03-04 20:44 ` Song Liu
2019-03-04 21:40 ` Song Liu
2019-03-05 11:03 ` Jiri Olsa
2019-03-05 20:37 ` Song Liu
2019-02-26 0:20 ` [PATCH v4 perf,bpf 15/15] perf, bpf: save information about short living bpf programs Song Liu
2019-02-27 13:21 ` Jiri Olsa
2019-02-27 17:42 ` Song Liu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6D86D79B-6E72-4E42-86F8-41D1357229BF@fb.com \
--to=songliubraving@fb.com \
--cc=Kernel-team@fb.com \
--cc=acme@redhat.com \
--cc=ast@kernel.org \
--cc=daniel@iogearbox.net \
--cc=jolsa@kernel.org \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=namhyung@kernel.org \
--cc=netdev@vger.kernel.org \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).