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perf tools: Handle PERF_RECORD_BPF_EVENT
This patch adds basic handling of PERF_RECORD_BPF_EVENT. Tracking of
PERF_RECORD_BPF_EVENT is OFF by default. Option --bpf-event is added to
turn it on.
Committer notes:
Add dummy machine__process_bpf_event() variant that returns zero for
systems without HAVE_LIBBPF_SUPPORT, such as Alpine Linux, unbreaking
the build in such systems.
Remove the needless include <machine.h> from bpf->event.h, provide just
forward declarations for the structs and unions in the parameters, to
reduce compilation time and needless rebuilds when machine.h gets
changed.
Committer testing:
When running with:
# perf record --bpf-event
On an older kernel where PERF_RECORD_BPF_EVENT and PERF_RECORD_KSYMBOL
is not present, we fallback to removing those two bits from
perf_event_attr, making the tool to continue to work on older kernels:
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
ksymbol 1
bpf_event 1
------------------------------------------------------------
sys_perf_event_open: pid 5779 cpu 0 group_fd -1 flags 0x8
sys_perf_event_open failed, error -22
switching off bpf_event
------------------------------------------------------------
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
ksymbol 1
------------------------------------------------------------
sys_perf_event_open: pid 5779 cpu 0 group_fd -1 flags 0x8
sys_perf_event_open failed, error -22
switching off ksymbol
------------------------------------------------------------
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
mmap 1
comm 1
freq 1
enable_on_exec 1
task 1
precise_ip 3
sample_id_all 1
exclude_guest 1
mmap2 1
comm_exec 1
------------------------------------------------------------
And then proceeds to work without those two features.
As passing --bpf-event is an explicit action performed by the user, perhaps we
should emit a warning telling that the kernel has no such feature, but this can
be done on top of this patch.
Now with a kernel that supports these events, start the 'record --bpf-event -a'
and then run 'perf trace sleep 10000' that will use the BPF
augmented_raw_syscalls.o prebuilt (for another kernel version even) and thus
should generate PERF_RECORD_BPF_EVENT events:
[root@quaco ~]# perf record -e dummy -a --bpf-event
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.713 MB perf.data ]
[root@quaco ~]# 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
31: tracepoint name sys_enter tag 12504ba9402f952f gpl
loaded_at 2019-01-19T09:19:56-0300 uid 0
xlated 512B jited 374B memlock 4096B map_ids 30,29,28
32: tracepoint name sys_exit tag c1bd85c092d6e4aa gpl
loaded_at 2019-01-19T09:19:56-0300 uid 0
xlated 256B jited 191B memlock 4096B map_ids 30,29
# perf report -D | grep PERF_RECORD_BPF_EVENT | nl
1 0 55834574849 0x4fc8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 13
2 0 60129542145 0x5118 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 14
3 0 64424509441 0x5268 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 15
4 0 68719476737 0x53b8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 16
5 0 73014444033 0x5508 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 17
6 0 77309411329 0x5658 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 18
7 0 90194313217 0x57a8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 21
8 0 94489280513 0x58f8 [0x18]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 22
9 7 620922484360 0xb6390 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 29
10 7 620922486018 0xb6410 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 2, flags 0, id 29
11 7 620922579199 0xb6490 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 30
12 7 620922580240 0xb6510 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 2, flags 0, id 30
13 7 620922765207 0xb6598 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 31
14 7 620922874543 0xb6620 [0x30]: PERF_RECORD_BPF_EVENT bpf event with type 1, flags 0, id 32
#
There, the 31 and 32 tracepoint BPF programs put in place by 'perf trace'.
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/20190117161521.1341602-7-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
9aa0bfa370
commit
45178a928a
@ -1839,6 +1839,7 @@ static struct option __record_options[] = {
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OPT_BOOLEAN(0, "tail-synthesize", &record.opts.tail_synthesize,
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"synthesize non-sample events at the end of output"),
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OPT_BOOLEAN(0, "overwrite", &record.opts.overwrite, "use overwrite mode"),
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OPT_BOOLEAN(0, "bpf-event", &record.opts.bpf_event, "record bpf events"),
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OPT_BOOLEAN(0, "strict-freq", &record.opts.strict_freq,
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"Fail if the specified frequency can't be used"),
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OPT_CALLBACK('F', "freq", &record.opts, "freq or 'max'",
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@ -66,6 +66,7 @@ struct record_opts {
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bool ignore_missing_thread;
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bool strict_freq;
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bool sample_id;
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bool bpf_event;
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unsigned int freq;
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unsigned int mmap_pages;
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unsigned int auxtrace_mmap_pages;
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@ -154,6 +154,8 @@ endif
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libperf-y += perf-hooks.o
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libperf-$(CONFIG_LIBBPF) += bpf-event.o
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libperf-$(CONFIG_CXX) += c++/
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CFLAGS_config.o += -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
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15
tools/perf/util/bpf-event.c
Normal file
15
tools/perf/util/bpf-event.c
Normal file
@ -0,0 +1,15 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <bpf/bpf.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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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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{
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if (dump_trace)
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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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22
tools/perf/util/bpf-event.h
Normal file
22
tools/perf/util/bpf-event.h
Normal file
@ -0,0 +1,22 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_BPF_EVENT_H
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#define __PERF_BPF_EVENT_H
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#include <linux/compiler.h>
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struct machine;
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union perf_event;
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struct perf_sample;
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#ifdef HAVE_LIBBPF_SUPPORT
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int machine__process_bpf_event(struct machine *machine, union perf_event *event,
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struct perf_sample *sample);
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#else
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static inline int machine__process_bpf_event(struct machine *machine __maybe_unused,
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union perf_event *event __maybe_unused,
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struct perf_sample *sample __maybe_unused)
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{
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return 0;
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}
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#endif // HAVE_LIBBPF_SUPPORT
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#endif
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@ -25,6 +25,7 @@
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#include "asm/bug.h"
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#include "stat.h"
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#include "session.h"
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#include "bpf-event.h"
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#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
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@ -47,6 +48,7 @@ static const char *perf_event__names[] = {
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[PERF_RECORD_SWITCH_CPU_WIDE] = "SWITCH_CPU_WIDE",
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[PERF_RECORD_NAMESPACES] = "NAMESPACES",
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[PERF_RECORD_KSYMBOL] = "KSYMBOL",
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[PERF_RECORD_BPF_EVENT] = "BPF_EVENT",
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[PERF_RECORD_HEADER_ATTR] = "ATTR",
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[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
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[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
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@ -1339,6 +1341,14 @@ int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
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return machine__process_ksymbol(machine, event, sample);
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}
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int perf_event__process_bpf_event(struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample __maybe_unused,
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struct machine *machine)
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{
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return machine__process_bpf_event(machine, event, sample);
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}
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size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
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{
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return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
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@ -1479,6 +1489,13 @@ size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
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event->ksymbol_event.flags, event->ksymbol_event.name);
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}
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size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp)
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{
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return fprintf(fp, " bpf event with type %u, flags %u, id %u\n",
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event->bpf_event.type, event->bpf_event.flags,
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event->bpf_event.id);
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}
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size_t perf_event__fprintf(union perf_event *event, FILE *fp)
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{
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size_t ret = fprintf(fp, "PERF_RECORD_%s",
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@ -1517,6 +1534,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
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case PERF_RECORD_KSYMBOL:
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ret += perf_event__fprintf_ksymbol(event, fp);
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break;
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case PERF_RECORD_BPF_EVENT:
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ret += perf_event__fprintf_bpf_event(event, fp);
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break;
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default:
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ret += fprintf(fp, "\n");
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}
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@ -98,6 +98,16 @@ struct ksymbol_event {
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char name[KSYM_NAME_LEN];
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};
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struct bpf_event {
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struct perf_event_header header;
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u16 type;
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u16 flags;
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u32 id;
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/* for bpf_prog types */
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u8 tag[BPF_TAG_SIZE]; // prog tag
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};
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#define PERF_SAMPLE_MASK \
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(PERF_SAMPLE_IP | PERF_SAMPLE_TID | \
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PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR | \
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@ -666,6 +676,7 @@ union perf_event {
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struct time_conv_event time_conv;
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struct feature_event feat;
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struct ksymbol_event ksymbol_event;
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struct bpf_event bpf_event;
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};
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void perf_event__print_totals(void);
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@ -767,6 +778,10 @@ int perf_event__process_ksymbol(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct machine *machine);
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int perf_event__process_bpf_event(struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct machine *machine);
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int perf_tool__process_synth_event(struct perf_tool *tool,
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union perf_event *event,
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struct machine *machine,
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@ -831,6 +846,7 @@ size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
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size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
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size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
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size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
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size_t perf_event__fprintf_bpf_event(union perf_event *event, FILE *fp);
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size_t perf_event__fprintf(union perf_event *event, FILE *fp);
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int kallsyms__get_function_start(const char *kallsyms_filename,
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@ -1036,6 +1036,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
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attr->mmap2 = track && !perf_missing_features.mmap2;
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attr->comm = track;
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attr->ksymbol = track && !perf_missing_features.ksymbol;
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attr->bpf_event = track && opts->bpf_event &&
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!perf_missing_features.bpf_event;
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if (opts->record_namespaces)
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attr->namespaces = track;
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@ -1654,6 +1656,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
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PRINT_ATTRf(write_backward, p_unsigned);
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PRINT_ATTRf(namespaces, p_unsigned);
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PRINT_ATTRf(ksymbol, p_unsigned);
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PRINT_ATTRf(bpf_event, p_unsigned);
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PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
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PRINT_ATTRf(bp_type, p_unsigned);
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@ -1815,6 +1818,8 @@ fallback_missing_features:
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evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
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if (perf_missing_features.ksymbol)
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evsel->attr.ksymbol = 0;
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if (perf_missing_features.bpf_event)
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evsel->attr.bpf_event = 0;
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retry_sample_id:
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if (perf_missing_features.sample_id_all)
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evsel->attr.sample_id_all = 0;
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@ -1934,7 +1939,11 @@ try_fallback:
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* Must probe features in the order they were added to the
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* perf_event_attr interface.
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*/
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if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
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if (!perf_missing_features.bpf_event && evsel->attr.bpf_event) {
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perf_missing_features.bpf_event = true;
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pr_debug2("switching off bpf_event\n");
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goto fallback_missing_features;
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} else if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
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perf_missing_features.ksymbol = true;
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pr_debug2("switching off ksymbol\n");
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goto fallback_missing_features;
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@ -169,6 +169,7 @@ struct perf_missing_features {
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bool write_backward;
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bool group_read;
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bool ksymbol;
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bool bpf_event;
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};
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extern struct perf_missing_features perf_missing_features;
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@ -21,6 +21,7 @@
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#include "unwind.h"
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#include "linux/hash.h"
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#include "asm/bug.h"
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#include "bpf-event.h"
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#include "sane_ctype.h"
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#include <symbol/kallsyms.h>
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@ -1867,6 +1868,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
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ret = machine__process_switch_event(machine, event); break;
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case PERF_RECORD_KSYMBOL:
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ret = machine__process_ksymbol(machine, event, sample); break;
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case PERF_RECORD_BPF_EVENT:
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ret = machine__process_bpf_event(machine, event, sample); break;
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default:
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ret = -1;
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break;
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@ -381,6 +381,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
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tool->context_switch = perf_event__process_switch;
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if (tool->ksymbol == NULL)
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tool->ksymbol = perf_event__process_ksymbol;
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if (tool->bpf_event == NULL)
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tool->bpf_event = perf_event__process_bpf_event;
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if (tool->read == NULL)
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tool->read = process_event_sample_stub;
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if (tool->throttle == NULL)
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@ -1314,6 +1316,8 @@ static int machines__deliver_event(struct machines *machines,
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return tool->context_switch(tool, event, sample, machine);
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case PERF_RECORD_KSYMBOL:
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return tool->ksymbol(tool, event, sample, machine);
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case PERF_RECORD_BPF_EVENT:
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return tool->bpf_event(tool, event, sample, machine);
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default:
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++evlist->stats.nr_unknown_events;
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return -1;
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@ -54,7 +54,8 @@ struct perf_tool {
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context_switch,
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throttle,
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unthrottle,
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ksymbol;
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ksymbol,
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bpf_event;
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event_attr_op attr;
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event_attr_op event_update;
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