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03e0a7df3e
linux/tools/perf/util
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Wang Nan 03e0a7df3e perf tools: Introduce bpf-output event 
Commit a43eec3042 ("bpf: introduce bpf_perf_event_output() helper")
adds a helper to enable a BPF program to output data to a perf ring
buffer through a new type of perf event, PERF_COUNT_SW_BPF_OUTPUT. This
patch enables perf to create events of that type. Now a perf user can
use the following cmdline to receive output data from BPF programs:

  # perf record -a -e bpf-output/no-inherit,name=evt/ \
                    -e ./test_bpf_output.c/map:channel.event=evt/ ls /
  # perf script
     perf 1560 [004] 347747.086295:  evt: ffffffff811fd201 sys_write ...
     perf 1560 [004] 347747.086300:  evt: ffffffff811fd201 sys_write ...
     perf 1560 [004] 347747.086315:  evt: ffffffff811fd201 sys_write ...
            ...

Test result:

  # cat test_bpf_output.c
  /************************ BEGIN **************************/
  #include <uapi/linux/bpf.h>
  struct bpf_map_def {
 	unsigned int type;
 	unsigned int key_size;
 	unsigned int value_size;
 	unsigned int max_entries;
  };

  #define SEC(NAME) __attribute__((section(NAME), used))
  static u64 (*ktime_get_ns)(void) =
 	(void *)BPF_FUNC_ktime_get_ns;
  static int (*trace_printk)(const char *fmt, int fmt_size, ...) =
 	(void *)BPF_FUNC_trace_printk;
  static int (*get_smp_processor_id)(void) =
 	(void *)BPF_FUNC_get_smp_processor_id;
  static int (*perf_event_output)(void *, struct bpf_map_def *, int, void *, unsigned long) =
 	(void *)BPF_FUNC_perf_event_output;

  struct bpf_map_def SEC("maps") channel = {
 	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
 	.key_size = sizeof(int),
 	.value_size = sizeof(u32),
 	.max_entries = __NR_CPUS__,
  };

  SEC("func_write=sys_write")
  int func_write(void *ctx)
  {
 	struct {
 		u64 ktime;
 		int cpuid;
 	} __attribute__((packed)) output_data;
 	char error_data[] = "Error: failed to output: %d\n";

 	output_data.cpuid = get_smp_processor_id();
 	output_data.ktime = ktime_get_ns();
 	int err = perf_event_output(ctx, &channel, get_smp_processor_id(),
 				    &output_data, sizeof(output_data));
 	if (err)
 		trace_printk(error_data, sizeof(error_data), err);
 	return 0;
  }
  char _license[] SEC("license") = "GPL";
  int _version SEC("version") = LINUX_VERSION_CODE;
  /************************ END ***************************/

  # perf record -a -e bpf-output/no-inherit,name=evt/ \
                    -e ./test_bpf_output.c/map:channel.event=evt/ ls /
  # perf script | grep ls
     ls  2242 [003] 347851.557563:   evt: ffffffff811fd201 sys_write ...
     ls  2242 [003] 347851.557571:   evt: ffffffff811fd201 sys_write ...

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Cody P Schafer <dev@codyps.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jeremie Galarneau <jeremie.galarneau@efficios.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kirill Smelkov <kirr@nexedi.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456132275-98875-11-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-02-22 14:37:21 -03:00
..
include tools lib: Move bitmap.[ch] from tools/perf/ to tools/{lib,include}/ 2016-01-08 12:35:46 -03:00
intel-pt-decoder perf intel-pt: Make logging slightly more efficient 2015-09-28 16:45:26 -03:00
scripting-engines perf script: Add python support for stat events 2016-01-06 20:11:16 -03:00
abspath.c
alias.c
annotate.c perf annotate: ARM support 2015-12-07 18:13:00 -03:00
annotate.h perf annotate: Fix sizeof_sym_hist overflow issue 2015-10-05 16:15:38 -03:00
auxtrace.c perf auxtrace: Add perf_evlist pointer to *info_priv_size() 2016-01-29 17:14:30 -03:00
auxtrace.h perf auxtrace: Add perf_evlist pointer to *info_priv_size() 2016-01-29 17:14:30 -03:00
bpf-loader.c perf tools: Introduce bpf-output event 2016-02-22 14:37:21 -03:00
bpf-loader.h perf tools: Support setting different slots in a BPF map separately 2016-02-22 12:48:50 -03:00
bpf-prologue.c perf bpf: Add prologue for BPF programs for fetching arguments 2015-11-18 17:51:04 -03:00
bpf-prologue.h perf bpf: Add prologue for BPF programs for fetching arguments 2015-11-18 17:51:04 -03:00
Build perf jit: add source line info support 2016-02-05 12:33:09 -03:00
build-id.c perf symbols: Fix symbols searching for module in buildid-cache 2016-02-12 10:54:47 -03:00
build-id.h perf symbols: Fix symbols searching for module in buildid-cache 2016-02-12 10:54:47 -03:00
cache.h perf config: Add '--system' and '--user' options to select which config file is used 2016-02-12 10:54:46 -03:00
callchain.c perf callchain: Check return value of append_chain_children() 2016-02-19 19:15:01 -03:00
callchain.h perf top: Decay periods in callchains 2016-01-08 12:37:51 -03:00
cgroup.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
cgroup.h perf cgroup: Use atomic.h for refcounting 2015-05-15 16:12:20 -03:00
cloexec.c perf bench numa: Fix to show proper convergence stats 2015-06-25 12:28:35 -03:00
cloexec.h perf tools: Fix build errors with mipsel-linux-uclibc compiler 2015-08-05 16:56:16 -03:00
color.c perf tools: Remove unused pager_use_color variable 2015-12-09 13:42:02 -03:00
color.h perf tools: Remove trail argument to color vsprintf 2015-08-05 16:44:02 -03:00
comm.c perf comm: Use atomic.h for refcounting 2015-05-27 12:21:43 -03:00
comm.h
config.c perf config: Add '--system' and '--user' options to select which config file is used 2016-02-12 10:54:46 -03:00
counts.c perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
counts.h perf stat: Move perf_counts struct and functions into separate object 2015-08-08 14:16:49 -03:00
cpumap.c perf cpumap: Auto initialize cpu__max_{node,cpu} 2016-01-26 16:08:36 -03:00
cpumap.h perf cpumap: Auto initialize cpu__max_{node,cpu} 2016-01-26 16:08:36 -03:00
ctype.c
data-convert-bt.c perf data: Fix releasing event_class 2016-02-12 17:27:48 -03:00
data-convert-bt.h perf data: Support using -f to override perf.data file ownership for 'convert' 2015-04-02 13:18:52 -03:00
data.c
data.h
db-export.c perf db-export: Fix thread ref-counting 2015-05-29 12:43:39 -03:00
db-export.h perf db-export: No need to have ->thread twice in struct export_sample 2015-04-02 13:18:43 -03:00
debug.c perf tools: Initialize libapi debug output 2016-02-16 17:12:59 -03:00
debug.h perf tools: Initialize libapi debug output 2016-02-16 17:12:59 -03:00
demangle-java.c perf symbols: add Java demangling support 2016-02-05 09:46:45 -03:00
demangle-java.h perf symbols: add Java demangling support 2016-02-05 09:46:45 -03:00
dso.c perf symbols: Do not read symbols/data from device files 2016-01-26 11:52:43 -03:00
dso.h perf symbols: Fix dso lookup by long name and missing buildids 2015-11-13 11:14:36 -03:00
dwarf-aux.c perf probe: Fix to add missed brace around if block 2015-08-13 14:51:26 -03:00
dwarf-aux.h perf probe: Ignore tail calls to probed functions 2015-05-14 10:05:09 -03:00
env.c perf tools: Add perf data cache feature 2016-02-16 17:13:00 -03:00
env.h perf tools: Add perf data cache feature 2016-02-16 17:13:00 -03:00
event.c perf tools: handle spaces in file names obtained from /proc/pid/maps 2016-02-05 09:39:56 -03:00
event.h perf tools: Add event_update event cpus type 2015-12-17 15:13:38 -03:00
evlist.c perf tools: Enable passing event to BPF object 2016-02-22 12:30:50 -03:00
evlist.h perf tools: Enable passing event to BPF object 2016-02-22 12:30:50 -03:00
evsel.c perf tools: Introduce bpf-output event 2016-02-22 14:37:21 -03:00
evsel.h perf tools: Introduce bpf-output event 2016-02-22 14:37:21 -03:00
find-vdso-map.c
genelf_debug.c perf jit: add source line info support 2016-02-05 12:33:09 -03:00
genelf.c perf jit: add source line info support 2016-02-05 12:33:09 -03:00
genelf.h perf jit: add source line info support 2016-02-05 12:33:09 -03:00
generate-cmdlist.sh perf tools: Do not show trace command if it's not compiled in 2016-01-08 12:46:17 -03:00
header.c perf tools: Add perf data cache feature 2016-02-16 17:13:00 -03:00
header.h perf tools: Add perf data cache feature 2016-02-16 17:13:00 -03:00
help-unknown-cmd.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
help-unknown-cmd.h perf tools: Move help_unknown_cmd() to its own file 2015-12-14 12:30:37 -03:00
hist.c perf tools: Fix column width setting on 'trace' sort key 2016-02-22 12:06:53 -03:00
hist.h perf hists: Return error from hists__collapse_resort() 2016-02-19 19:16:06 -03:00
intel-bts.c perf tools: Fix use of wrong event when processing exit events 2015-09-02 17:46:26 -03:00
intel-bts.h perf tools: Add Intel BTS support 2015-08-21 11:34:10 -03:00
intel-pt.c perf tools: Fix thread lifetime related segfaut in intel_pt 2016-02-02 12:51:11 -03:00
intel-pt.h perf tools: Pass Intel PT information for decoding MTC and CYC 2015-08-24 17:46:43 -03:00
intlist.c
intlist.h
jit.h perf inject: Add jitdump mmap injection support 2016-02-05 09:46:45 -03:00
jitdump.c perf jit: add source line info support 2016-02-05 12:33:09 -03:00
jitdump.h perf inject: Add jitdump mmap injection support 2016-02-05 09:46:45 -03:00
kvm-stat.h perf kvm/powerpc: Port perf kvm stat to powerpc 2016-01-29 17:49:54 -03:00
levenshtein.c
levenshtein.h
llvm-utils.c perf tools: Make fetch_kernel_version() publicly available 2015-11-06 15:57:18 -03:00
llvm-utils.h perf tests: Add LLVM test for eBPF on-the-fly compiling 2015-08-07 10:57:24 -03:00
lzma.c perf tools: Add lzma decompression support for kernel module 2015-03-21 14:53:40 -03:00
machine.c perf thread: Fix reference count initial state 2015-12-14 12:08:55 -03:00
machine.h perf machine: Introduce machine__find_kernel_symbol_by_name() 2016-01-26 11:52:51 -03:00
map.c perf tools: Fix maps__fixup_overlappings to put used maps 2015-12-09 13:42:00 -03:00
map.h perf maps: Introduce maps__find_symbol_by_name() 2015-09-30 18:34:25 -03:00
ordered-events.c perf ordered_events: Clear the progress bar at the end of a flush 2015-08-24 17:16:22 -03:00
ordered-events.h perf ordered_samples: Remove references to perf_{evlist,tool} and machines 2015-03-31 17:52:32 -03:00
parse-branch-options.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
parse-branch-options.h perf tools: Move branch option parsing to own file 2015-05-27 21:02:17 -03:00
parse-events.c perf tools: Apply tracepoint event definition options to BPF script 2016-02-22 13:02:44 -03:00
parse-events.h perf tools: Apply tracepoint event definition options to BPF script 2016-02-22 13:02:44 -03:00
parse-events.l perf tools: Introduce bpf-output event 2016-02-22 14:37:21 -03:00
parse-events.y perf tools: Enable indices setting syntax for BPF map 2016-02-22 12:59:49 -03:00
parse-regs-options.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
parse-regs-options.h perf record: Add ability to name registers to record 2015-08-31 18:01:33 -03:00
path.c perf tools: Move strlcpy() from perf to tools/lib/string.c 2015-12-16 16:09:39 -03:00
perf_regs.c perf tools: Fix build break on powerpc due to sample_reg_masks 2015-09-30 18:34:27 -03:00
perf_regs.h perf tools: Fix build break on powerpc due to sample_reg_masks 2015-09-30 18:34:27 -03:00
PERF-VERSION-GEN
pmu.c perf tools: Use perf_event_terms__purge() for non-malloced terms 2016-02-12 16:53:22 -03:00
pmu.h perf tools: Add perf_pmu__format_bits() 2015-08-06 16:49:01 -03:00
pmu.l
pmu.y
probe-event.c perf bpf: Allow BPF program config probing options 2015-11-18 17:51:04 -03:00
probe-event.h perf probe: Export init/exit_probe_symbol_maps() 2015-09-15 09:48:32 -03:00
probe-file.c perf probe: Verify parameters in two functions 2015-11-11 18:41:32 -03:00
probe-file.h perf probe: Print deleted events in cmd_probe() 2015-09-04 12:43:44 -03:00
probe-finder.c perf probe: Search both .eh_frame and .debug_frame sections for probe location 2016-02-02 13:30:16 -03:00
probe-finder.h perf probe: Search both .eh_frame and .debug_frame sections for probe location 2016-02-02 13:30:16 -03:00
pstack.c perf tools: Introduce pstack_peek() 2015-05-05 18:13:22 -03:00
pstack.h perf tools: Introduce pstack_peek() 2015-05-05 18:13:22 -03:00
python-ext-sources tools lib: Move bitmap.[ch] from tools/perf/ to tools/{lib,include}/ 2016-01-08 12:35:46 -03:00
python.c perf python: Support the PERF_RECORD_SWITCH event 2015-10-07 19:41:50 -03:00
quote.c
quote.h
rblist.c
rblist.h
record.c perf tools: Add a helper function to probe whether cpu-wide tracing is possible 2015-08-17 11:08:37 -03:00
session.c perf kvm record/report: 'unprocessable sample' error while recording/reporting guest data 2016-01-15 16:31:58 -03:00
session.h perf tools: Make perf_session__register_idle_thread drop the refcount 2015-12-10 16:28:58 -03:00
setup.py tools lib api: Rename libapikfs.a to libapi.a 2015-02-12 17:55:18 -03:00
sort.c perf tools: Fix column width setting on 'trace' sort key 2016-02-22 12:06:53 -03:00
sort.h perf hists browser: Offer 'Zoom into DSO'/'Map details' only when sort order has 'dso' 2016-01-26 11:52:50 -03:00
srcline.c perf tools: Always use non inlined file name for 'srcfile' sort key 2015-09-02 16:30:46 -03:00
stat-shadow.c perf stat: Abstract stat metrics printing 2016-02-16 17:13:00 -03:00
stat.c Merge branch 'perf/urgent' into perf/core, to pick up fixes 2016-02-04 08:57:44 +01:00
stat.h perf stat: Abstract stat metrics printing 2016-02-16 17:13:00 -03:00
strbuf.c perf tools: Introduce usage_with_options_msg() 2015-10-27 09:28:44 -03:00
strbuf.h perf tools: Introduce usage_with_options_msg() 2015-10-27 09:28:44 -03:00
strfilter.c perf tools: Add strfilter__string to recover rules string 2015-05-04 12:43:54 -03:00
strfilter.h perf tools: Add strfilter__string to recover rules string 2015-05-04 12:43:54 -03:00
string.c tools: Adopt memdup() from tools/perf, moving it to tools/lib/string.c 2015-11-18 17:51:02 -03:00
strlist.c perf tools: Add file_only config option to strlist 2016-01-12 12:42:07 -03:00
strlist.h perf tools: Add file_only config option to strlist 2016-01-12 12:42:07 -03:00
svghelper.c perf tools: Add reference counting for cpu_map object 2015-06-25 15:15:50 -03:00
svghelper.h
symbol-elf.c perf symbols: add Java demangling support 2016-02-05 09:46:45 -03:00
symbol-minimal.c perf symbols: Fix type error when reading a build-id 2015-10-28 10:02:00 -03:00
symbol.c perf symbols: Fix symbols searching for module in buildid-cache 2016-02-12 10:54:47 -03:00
symbol.h perf report/top: Add --raw-trace option 2016-01-06 20:11:12 -03:00
target.c perf target: Simplify handling of strerror_r return 2015-03-24 12:08:30 -03:00
target.h
term.c perf tools: Move term functions out of util.c 2015-12-09 13:42:02 -03:00
term.h perf tools: Move term functions out of util.c 2015-12-09 13:42:02 -03:00
thread_map.c perf thread_map: Add thread_map__new_event function 2015-12-17 14:38:16 -03:00
thread_map.h perf thread_map: Add thread_map__new_event function 2015-12-17 14:38:16 -03:00
thread-stack.c perf tools: Ensure thread-stack is flushed 2015-06-19 16:03:33 -03:00
thread-stack.h perf tools: Ensure thread-stack is flushed 2015-06-19 16:03:33 -03:00
thread.c perf thread: Fix reference count initial state 2015-12-14 12:08:55 -03:00
thread.h perf tools: Elliminate alignment holes 2015-05-18 10:17:33 -03:00
tool.h perf tools: Add event_update user level event 2015-12-17 15:10:16 -03:00
top.c
top.h
trace-event-info.c tools lib api fs: Move tracing_path interface into api/fs/tracing_path.c 2015-09-04 12:00:45 -03:00
trace-event-parse.c irq_poll: make blk-iopoll available outside the block layer 2015-12-11 11:52:24 -08:00
trace-event-read.c perf tools: Stop reading the kallsyms data from perf.data 2015-07-23 22:51:11 -03:00
trace-event-scripting.c perf scripting: No need to pass thread twice to the scripting callbacks 2015-04-02 13:18:41 -03:00
trace-event.c tools lib api fs: Adopt filename__read_str from perf 2016-02-16 17:12:56 -03:00
trace-event.h perf script: Add process_stat/process_stat_interval scripting interface 2016-01-06 20:11:15 -03:00
tsc.c
tsc.h
unwind-libdw.c perf libdw: Check for mmaps also in MAP__VARIABLE tree 2016-01-08 14:16:57 -03:00
unwind-libdw.h perf callchain: Add order support for libdw DWARF unwinder 2015-11-23 18:31:13 -03:00
unwind-libunwind.c perf unwind: Check for mmaps also in MAP__VARIABLE tree 2016-01-08 14:16:34 -03:00
unwind.h
usage.c perf test: Suppress libtraceevent warnings 2015-10-19 14:58:10 -03:00
util.c tools lib api fs: Adopt filename__read_str from perf 2016-02-16 17:12:56 -03:00
util.h tools lib api fs: Adopt filename__read_str from perf 2016-02-16 17:12:56 -03:00
values.c
values.h
vdso.c perf tools: Fix lockup using 32-bit compat vdso 2015-07-07 11:05:08 -03:00
vdso.h perf machine: Fix up vdso methods names 2015-05-29 12:43:44 -03:00
wrapper.c
xyarray.c perf tools: Introduce xyarray__reset function 2015-06-16 10:34:39 -03:00
xyarray.h perf tools: Introduce xyarray__reset function 2015-06-16 10:34:39 -03:00
zlib.c