linux/tools/perf/util
Wang Nan e571e029bd perf tools: Enable indices setting syntax for BPF map
This patch introduces a new syntax to perf event parser:

 # perf record -e './test_bpf_map_3.c/map:channel.value[0,1,2,3...5]=101/' usleep 2

By utilizing the basic facilities in bpf-loader.c which allow setting
different slots in a BPF map separately, the newly introduced syntax
allows perf to control specific elements in a BPF map.

Test result:

  # cat ./test_bpf_map_3.c
  /************************ BEGIN **************************/
  #include <uapi/linux/bpf.h>
  #define SEC(NAME) __attribute__((section(NAME), used))
  struct bpf_map_def {
	unsigned int type;
	unsigned int key_size;
	unsigned int value_size;
	unsigned int max_entries;
  };
  static void *(*map_lookup_elem)(struct bpf_map_def *, void *) =
 	(void *)BPF_FUNC_map_lookup_elem;
  static int (*trace_printk)(const char *fmt, int fmt_size, ...) =
 	(void *)BPF_FUNC_trace_printk;
  struct bpf_map_def SEC("maps") channel = {
 	.type = BPF_MAP_TYPE_ARRAY,
 	.key_size = sizeof(int),
 	.value_size = sizeof(unsigned char),
 	.max_entries = 100,
  };
  SEC("func=hrtimer_nanosleep rqtp->tv_nsec")
  int func(void *ctx, int err, long nsec)
  {
 	char fmt[] = "%ld\n";
 	long usec = nsec * 0x10624dd3 >> 38; // nsec / 1000
 	int key = (int)usec;
 	unsigned char *pval = map_lookup_elem(&channel, &key);

 	if (!pval)
 		return 0;
 	trace_printk(fmt, sizeof(fmt), (unsigned char)*pval);
 	return 0;
  }
  char _license[] SEC("license") = "GPL";
  int _version SEC("version") = LINUX_VERSION_CODE;
  /************************* END ***************************/

Normal case:

  # echo "" > /sys/kernel/debug/tracing/trace
  # ./perf record -e './test_bpf_map_3.c/map:channel.value[0,1,2,3...5]=101/' usleep 2
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.012 MB perf.data ]
  # cat /sys/kernel/debug/tracing/trace | grep usleep
            usleep-405   [004] d... 2745423.547822: : 101
  # ./perf record -e './test_bpf_map_3.c/map:channel.value[0...9,20...29]=102,map:channel.value[10...19]=103/' usleep 3
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.012 MB perf.data ]
  # ./perf record -e './test_bpf_map_3.c/map:channel.value[0...9,20...29]=102,map:channel.value[10...19]=103/' usleep 15
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.012 MB perf.data ]
  # cat /sys/kernel/debug/tracing/trace | grep usleep
            usleep-405   [004] d... 2745423.547822: : 101
            usleep-655   [006] d... 2745434.122814: : 102
            usleep-904   [006] d... 2745439.916264: : 103
  # ./perf record -e './test_bpf_map_3.c/map:channel.value[all]=104/' usleep 99
  # cat /sys/kernel/debug/tracing/trace | grep usleep
            usleep-405   [004] d... 2745423.547822: : 101
            usleep-655   [006] d... 2745434.122814: : 102
            usleep-904   [006] d... 2745439.916264: : 103
            usleep-1537  [003] d... 2745538.053737: : 104

Error case:

  # ./perf record -e './test_bpf_map_3.c/map:channel.value[10...1000]=104/' usleep 99
  event syntax error: '..annel.value[10...1000]=104/'
                                   \___ Index too large
  Hint:	Valid config terms:
      	map:[<arraymap>].value<indices>=[value]
      	map:[<eventmap>].event<indices>=[event]

      	where <indices> is something like [0,3...5] or [all]
      	(add -v to see detail)
  Run 'perf list' for a list of valid events

   Usage: perf record [<options>] [<command>]
      or: perf record [<options>] -- <command> [<options>]

      -e, --event <event>   event selector. use 'perf list' to list available events

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.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: 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/1456132275-98875-9-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-02-22 12:59:49 -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 perf tools: Introduce zfree 2013-12-27 15:17:00 -03:00
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: Support setting different slots in a BPF map separately 2016-02-22 12:48:50 -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 perf tools: Add facility to export data in database-friendly way 2014-10-29 10:32:49 -02:00
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 perf tools: ctype.c only wants util.h 2012-02-13 23:17:40 -02:00
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 perf util: Replace strerror with strerror_r for thread-safety 2014-08-15 10:58:35 -03:00
data.h perf tools: Add perf_data_file__write interface 2013-12-02 09:22:46 -03:00
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 record: Add --all-user/--all-kernel options 2016-02-18 10:48:44 -03:00
evsel.h perf evlist: Add --trace-fields option to show trace fields 2016-01-08 14:23:02 -03:00
find-vdso-map.c perf tools: Build programs to copy 32-bit compatibility 2014-10-29 10:32:48 -02:00
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 perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
intlist.h perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
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: Enable indices setting syntax for BPF map 2016-02-22 12:59:49 -03:00
parse-events.h perf tools: Support setting different slots in a BPF map separately 2016-02-22 12:48:50 -03:00
parse-events.l perf tools: Enable indices setting syntax for BPF map 2016-02-22 12:59:49 -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 perf tools: Fix version when building out of tree 2013-11-07 10:40:47 -03:00
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 perf tools: Add perf pmu object to access pmu format definition 2012-03-16 14:29:35 -03:00
pmu.y perf tools: Fix build with bison 2.3 and older. 2013-02-14 16:12:34 -03:00
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 perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
rblist.h perf util: Add findnew method to intlist 2013-10-14 10:28:48 -03:00
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 perf timechart: Implement IO mode 2014-07-10 00:22:54 +02:00
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 perf target: Move the checking of which map function to call into function. 2013-12-04 13:46:37 -03:00
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 perf tools: Rename 'perf_record_opts' to 'record_opts 2013-12-19 14:43:45 -03:00
top.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
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 perf tools: Move rdtsc() function 2014-07-23 11:48:11 -03:00
tsc.h perf tools: Move rdtsc() function 2014-07-23 11:48:11 -03:00
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 perf callchains: Use thread->mg->machine 2014-10-29 10:32:46 -02:00
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 perf tools: Use zfree to help detect use after free bugs 2013-12-27 17:08:19 -03:00
values.h tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
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 perf tools: Use __maybe_used for unused variables 2012-09-11 12:19:15 -03:00
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 perf tools: Add gzip decompression support for kernel module 2014-11-05 10:11:26 -03:00