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perf tools: Synthesize PERF_RECORD_* for loaded BPF programs
This patch synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for
BPF programs loaded before perf-record. This is achieved by gathering
information about all BPF programs via sys_bpf.
Committer notes:
Fix the build on some older systems such as amazonlinux:1 where it was
breaking with:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:52:9: error: missing initializer for field 'type' of 'struct bpf_prog_info' [-Werror=missing-field-initializers]
struct bpf_prog_info info = {};
^
In file included from /git/linux/tools/lib/bpf/bpf.h:26:0,
from util/bpf-event.c:3:
/git/linux/tools/include/uapi/linux/bpf.h:2699:8: note: 'type' declared here
__u32 type;
^
cc1: all warnings being treated as errors
Further fix on a centos:6 system:
cc1: warnings being treated as errors
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:50: error: 'func_info_rec_size' may be used uninitialized in this function
The compiler is wrong, but to silence it, initialize that variable to
zero.
One more fix, this time for debian:experimental-x-mips, x-mips64 and
x-mipsel:
util/bpf-event.c: In function 'perf_event__synthesize_one_bpf_prog':
util/bpf-event.c:93:16: error: implicit declaration of function 'calloc' [-Werror=implicit-function-declaration]
func_infos = calloc(sub_prog_cnt, func_info_rec_size);
^~~~~~
util/bpf-event.c:93:16: error: incompatible implicit declaration of built-in function 'calloc' [-Werror]
util/bpf-event.c:93:16: note: include '<stdlib.h>' or provide a declaration of 'calloc'
Add the missing header.
Committer testing:
# perf record --bpf-event sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.021 MB perf.data (7 samples) ]
# perf report -D | grep PERF_RECORD_BPF_EVENT | nl
1 0 0x4b10 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 13
2 0 0x4c60 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 14
3 0 0x4db0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 15
4 0 0x4f00 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 16
5 0 0x5050 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 17
6 0 0x51a0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 18
7 0 0x52f0 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 21
8 0 0x5440 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 22
# bpftool prog
13: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
14: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 13,14
15: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
16: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:43-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 15,16
17: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
18: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:44-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 17,18
21: cgroup_skb tag 7be49e3934a125ba gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
22: cgroup_skb tag 2a142ef67aaad174 gpl
loaded_at 2019-01-19T09:09:45-0300 uid 0
xlated 296B jited 229B memlock 4096B map_ids 21,22
#
# perf report -D | grep -B22 PERF_RECORD_KSYMBOL
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 ff 44 06 c0 ff ff ff ff ......8..D......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x49d8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc00644ff len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 48 6d 06 c0 ff ff ff ff ......8.Hm......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4b28 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0066d48 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 04 cf 03 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4c78 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc003cf04 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 96 28 04 c0 ff ff ff ff ......8..(......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4dc8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0042896 len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 05 13 17 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x4f18 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0171305 len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 0a 8c 23 c0 ff ff ff ff ......8...#.....
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x5068 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0238c0a len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 2a a5 a4 c0 ff ff ff ff ......8.*.......
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 37 62 65 34 39 65 33 39 33 34 61 31 32 35 62 _7be49e3934a125b
. 0030: 61 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 7b e4 9e 39 34 a1 25 ba 00 00 00 00 00 00 00 00 {..94.%.........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x51b8 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4a52a len 229 type 1 flags 0x0 name bpf_prog_7be49e3934a125ba
--
. ... raw event: size 312 bytes
. 0000: 11 00 00 00 00 00 38 01 9b c9 a4 c0 ff ff ff ff ......8.........
. 0010: e5 00 00 00 01 00 00 00 62 70 66 5f 70 72 6f 67 ........bpf_prog
. 0020: 5f 32 61 31 34 32 65 66 36 37 61 61 61 64 31 37 _2a142ef67aaad17
. 0030: 34 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4...............
<SNIP zeroes>
. 0110: 00 00 00 00 00 00 00 00 21 00 00 00 00 00 00 00 ........!.......
. 0120: 2a 14 2e f6 7a aa d1 74 00 00 00 00 00 00 00 00 *...z..t........
. 0130: 00 00 00 00 00 00 00 00 ........
0 0x5308 [0x138]: PERF_RECORD_KSYMBOL ksymbol event with addr ffffffffc0a4c99b len 229 type 1 flags 0x0 name bpf_prog_2a142ef67aaad174
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-8-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Song Liu
Arnaldo Carvalho de Melo
parent
45178a928a
commit
7b612e291a
@ -41,6 +41,7 @@
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#include "util/perf-hooks.h"
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#include "util/time-utils.h"
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#include "util/units.h"
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#include "util/bpf-event.h"
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#include "asm/bug.h"
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#include <errno.h>
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@ -1082,6 +1083,11 @@ static int record__synthesize(struct record *rec, bool tail)
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return err;
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}
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err = perf_event__synthesize_bpf_events(tool, process_synthesized_event,
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machine, opts);
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if (err < 0)
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pr_warning("Couldn't synthesize bpf events.\n");
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err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
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process_synthesized_event, opts->sample_address,
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1);
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@ -1,10 +1,25 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <stdlib.h>
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#include <bpf/bpf.h>
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#include <bpf/btf.h>
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#include <linux/btf.h>
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#include "bpf-event.h"
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#include "debug.h"
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#include "symbol.h"
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#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
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static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
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{
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int ret = 0;
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size_t i;
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for (i = 0; i < len; i++)
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ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
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return ret;
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}
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int machine__process_bpf_event(struct machine *machine __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample __maybe_unused)
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@ -13,3 +28,230 @@ int machine__process_bpf_event(struct machine *machine __maybe_unused,
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perf_event__fprintf_bpf_event(event, stdout);
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return 0;
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}
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/*
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* Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
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* program. One PERF_RECORD_BPF_EVENT is generated for the program. And
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* one PERF_RECORD_KSYMBOL is generated for each sub program.
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*
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* Returns:
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* 0 for success;
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* -1 for failures;
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* -2 for lack of kernel support.
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*/
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static int perf_event__synthesize_one_bpf_prog(struct perf_tool *tool,
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perf_event__handler_t process,
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struct machine *machine,
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int fd,
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union perf_event *event,
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struct record_opts *opts)
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{
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struct ksymbol_event *ksymbol_event = &event->ksymbol_event;
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struct bpf_event *bpf_event = &event->bpf_event;
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u32 sub_prog_cnt, i, func_info_rec_size = 0;
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u8 (*prog_tags)[BPF_TAG_SIZE] = NULL;
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struct bpf_prog_info info = { .type = 0, };
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u32 info_len = sizeof(info);
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void *func_infos = NULL;
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u64 *prog_addrs = NULL;
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struct btf *btf = NULL;
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u32 *prog_lens = NULL;
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bool has_btf = false;
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char errbuf[512];
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int err = 0;
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/* Call bpf_obj_get_info_by_fd() to get sizes of arrays */
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err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
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if (err) {
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pr_debug("%s: failed to get BPF program info: %s, aborting\n",
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__func__, str_error_r(errno, errbuf, sizeof(errbuf)));
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return -1;
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}
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if (info_len < offsetof(struct bpf_prog_info, prog_tags)) {
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pr_debug("%s: the kernel is too old, aborting\n", __func__);
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return -2;
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}
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/* number of ksyms, func_lengths, and tags should match */
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sub_prog_cnt = info.nr_jited_ksyms;
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if (sub_prog_cnt != info.nr_prog_tags ||
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sub_prog_cnt != info.nr_jited_func_lens)
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return -1;
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/* check BTF func info support */
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if (info.btf_id && info.nr_func_info && info.func_info_rec_size) {
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/* btf func info number should be same as sub_prog_cnt */
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if (sub_prog_cnt != info.nr_func_info) {
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pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
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return -1;
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}
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if (btf__get_from_id(info.btf_id, &btf)) {
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pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info.btf_id);
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return -1;
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}
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func_info_rec_size = info.func_info_rec_size;
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func_infos = calloc(sub_prog_cnt, func_info_rec_size);
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if (!func_infos) {
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pr_debug("%s: failed to allocate memory for func_infos, aborting\n", __func__);
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return -1;
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}
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has_btf = true;
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}
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/*
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* We need address, length, and tag for each sub program.
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* Allocate memory and call bpf_obj_get_info_by_fd() again
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*/
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prog_addrs = calloc(sub_prog_cnt, sizeof(u64));
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if (!prog_addrs) {
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pr_debug("%s: failed to allocate memory for prog_addrs, aborting\n", __func__);
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goto out;
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}
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prog_lens = calloc(sub_prog_cnt, sizeof(u32));
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if (!prog_lens) {
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pr_debug("%s: failed to allocate memory for prog_lens, aborting\n", __func__);
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goto out;
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}
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prog_tags = calloc(sub_prog_cnt, BPF_TAG_SIZE);
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if (!prog_tags) {
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pr_debug("%s: failed to allocate memory for prog_tags, aborting\n", __func__);
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goto out;
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}
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memset(&info, 0, sizeof(info));
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info.nr_jited_ksyms = sub_prog_cnt;
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info.nr_jited_func_lens = sub_prog_cnt;
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info.nr_prog_tags = sub_prog_cnt;
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info.jited_ksyms = ptr_to_u64(prog_addrs);
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info.jited_func_lens = ptr_to_u64(prog_lens);
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info.prog_tags = ptr_to_u64(prog_tags);
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info_len = sizeof(info);
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if (has_btf) {
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info.nr_func_info = sub_prog_cnt;
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info.func_info_rec_size = func_info_rec_size;
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info.func_info = ptr_to_u64(func_infos);
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}
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err = bpf_obj_get_info_by_fd(fd, &info, &info_len);
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if (err) {
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pr_debug("%s: failed to get BPF program info, aborting\n", __func__);
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goto out;
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}
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/* Synthesize PERF_RECORD_KSYMBOL */
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for (i = 0; i < sub_prog_cnt; i++) {
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const struct bpf_func_info *finfo;
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const char *short_name = NULL;
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const struct btf_type *t;
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int name_len;
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*ksymbol_event = (struct ksymbol_event){
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.header = {
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.type = PERF_RECORD_KSYMBOL,
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.size = sizeof(struct ksymbol_event),
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},
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.addr = prog_addrs[i],
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.len = prog_lens[i],
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.ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
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.flags = 0,
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};
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name_len = snprintf(ksymbol_event->name, KSYM_NAME_LEN,
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"bpf_prog_");
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name_len += snprintf_hex(ksymbol_event->name + name_len,
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KSYM_NAME_LEN - name_len,
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prog_tags[i], BPF_TAG_SIZE);
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if (has_btf) {
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finfo = func_infos + i * info.func_info_rec_size;
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t = btf__type_by_id(btf, finfo->type_id);
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short_name = btf__name_by_offset(btf, t->name_off);
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} else if (i == 0 && sub_prog_cnt == 1) {
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/* no subprog */
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if (info.name[0])
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short_name = info.name;
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} else
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short_name = "F";
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if (short_name)
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name_len += snprintf(ksymbol_event->name + name_len,
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KSYM_NAME_LEN - name_len,
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"_%s", short_name);
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ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
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sizeof(u64));
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err = perf_tool__process_synth_event(tool, event,
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machine, process);
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}
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/* Synthesize PERF_RECORD_BPF_EVENT */
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if (opts->bpf_event) {
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*bpf_event = (struct bpf_event){
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.header = {
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.type = PERF_RECORD_BPF_EVENT,
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.size = sizeof(struct bpf_event),
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},
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.type = PERF_BPF_EVENT_PROG_LOAD,
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.flags = 0,
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.id = info.id,
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};
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memcpy(bpf_event->tag, prog_tags[i], BPF_TAG_SIZE);
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err = perf_tool__process_synth_event(tool, event,
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machine, process);
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}
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out:
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free(prog_tags);
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free(prog_lens);
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free(prog_addrs);
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free(func_infos);
|
||||
free(btf);
|
||||
return err ? -1 : 0;
|
||||
}
|
||||
|
||||
int perf_event__synthesize_bpf_events(struct perf_tool *tool,
|
||||
perf_event__handler_t process,
|
||||
struct machine *machine,
|
||||
struct record_opts *opts)
|
||||
{
|
||||
union perf_event *event;
|
||||
__u32 id = 0;
|
||||
int err;
|
||||
int fd;
|
||||
|
||||
event = malloc(sizeof(event->bpf_event) + KSYM_NAME_LEN);
|
||||
if (!event)
|
||||
return -1;
|
||||
while (true) {
|
||||
err = bpf_prog_get_next_id(id, &id);
|
||||
if (err) {
|
||||
if (errno == ENOENT) {
|
||||
err = 0;
|
||||
break;
|
||||
}
|
||||
pr_debug("%s: can't get next program: %s%s",
|
||||
__func__, strerror(errno),
|
||||
errno == EINVAL ? " -- kernel too old?" : "");
|
||||
/* don't report error on old kernel */
|
||||
err = (errno == EINVAL) ? 0 : -1;
|
||||
break;
|
||||
}
|
||||
fd = bpf_prog_get_fd_by_id(id);
|
||||
if (fd < 0) {
|
||||
pr_debug("%s: failed to get fd for prog_id %u\n",
|
||||
__func__, id);
|
||||
continue;
|
||||
}
|
||||
|
||||
err = perf_event__synthesize_one_bpf_prog(tool, process,
|
||||
machine, fd,
|
||||
event, opts);
|
||||
close(fd);
|
||||
if (err) {
|
||||
/* do not return error for old kernel */
|
||||
if (err == -2)
|
||||
err = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
free(event);
|
||||
return err;
|
||||
}
|
||||
|
||||
@ -3,14 +3,22 @@
|
||||
#define __PERF_BPF_EVENT_H
|
||||
|
||||
#include <linux/compiler.h>
|
||||
#include "event.h"
|
||||
|
||||
struct machine;
|
||||
union perf_event;
|
||||
struct perf_sample;
|
||||
struct perf_tool;
|
||||
struct record_opts;
|
||||
|
||||
#ifdef HAVE_LIBBPF_SUPPORT
|
||||
int machine__process_bpf_event(struct machine *machine, union perf_event *event,
|
||||
struct perf_sample *sample);
|
||||
|
||||
int perf_event__synthesize_bpf_events(struct perf_tool *tool,
|
||||
perf_event__handler_t process,
|
||||
struct machine *machine,
|
||||
struct record_opts *opts);
|
||||
#else
|
||||
static inline int machine__process_bpf_event(struct machine *machine __maybe_unused,
|
||||
union perf_event *event __maybe_unused,
|
||||
@ -18,5 +26,13 @@ static inline int machine__process_bpf_event(struct machine *machine __maybe_unu
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int perf_event__synthesize_bpf_events(struct perf_tool *tool __maybe_unused,
|
||||
perf_event__handler_t process __maybe_unused,
|
||||
struct machine *machine __maybe_unused,
|
||||
struct record_opts *opts __maybe_unused)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
#endif // HAVE_LIBBPF_SUPPORT
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user