kernel.git/tools/perf/util/evsel.h, branch linux-4.4.y

perf bpf: Attach eBPF filter to perf event

2015-10-29T20:16:22Z

This is the final patch which makes basic BPF filter work. After applying this patch, users are allowed to use BPF filter like: # perf record --event ./hello_world.o ls A bpf_fd field is appended to 'struct evsel', and setup during the callback function add_bpf_event() for each 'probe_trace_event'. PERF_EVENT_IOC_SET_BPF ioctl is used to attach eBPF program to a newly created perf event. The file descriptor of the eBPF program is passed to perf record using previous patches, and stored into evsel->bpf_fd. It is possible that different perf event are created for one kprobe events for different CPUs. In this case, when trying to call the ioctl, EEXIST will be return. This patch doesn't treat it as an error. Committer note: The bpf proggie used so far: __attribute__((section("fork=_do_fork"), used)) int fork(void *ctx) { return 0; } char _license[] __attribute__((section("license"), used)) = "GPL"; int _version __attribute__((section("version"), used)) = 0x40300; failed to produce any samples, even with forks happening and it being running in system wide mode. That is because now the filter is being associated, and the code above always returns zero, meaning that all forks will be probed but filtered away ;-/ Change it to 'return 1;' instead and after that: # trace --no-syscalls --event /tmp/foo.o 0.000 perf_bpf_probe:fork:(ffffffff8109be30)) 2.333 perf_bpf_probe:fork:(ffffffff8109be30)) 3.725 perf_bpf_probe:fork:(ffffffff8109be30)) 4.550 perf_bpf_probe:fork:(ffffffff8109be30)) ^C# And it works with all tools, including 'perf trace'. Signed-off-by: Wang Nan Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: Daniel Borkmann Cc: David Ahern Cc: He Kuang Cc: Jiri Olsa Cc: Kaixu Xia Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1444826502-49291-8-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Enable pre-event inherit setting by config terms

2015-10-28T14:19:16Z

This patch allows perf record setting event's attr.inherit bit by config terms like: # perf record -e cycles/no-inherit/ ... # perf record -e cycles/inherit/ ... So user can control inherit bit for each event separately. In following example, a.out fork()s in main then do some complex CPU intensive computations in both of its children. Basic result with and without inherit: # perf record -e cycles -e instructions ./a.out [ perf record: Woken up 9 times to write data ] [ perf record: Captured and wrote 2.205 MB perf.data (47920 samples) ] # perf report --stdio # ... # Samples: 23K of event 'cycles' # Event count (approx.): 23641752891 ... # Samples: 24K of event 'instructions' # Event count (approx.): 30428312415 # perf record -i -e cycles -e instructions ./a.out [ perf record: Woken up 5 times to write data ] [ perf record: Captured and wrote 1.111 MB perf.data (24019 samples) ] ... # Samples: 12K of event 'cycles' # Event count (approx.): 11699501775 ... # Samples: 12K of event 'instructions' # Event count (approx.): 15058023559 Cancel inherit for one event when globally enable: # perf record -e cycles/no-inherit/ -e instructions ./a.out [ perf record: Woken up 7 times to write data ] [ perf record: Captured and wrote 1.660 MB perf.data (36004 samples) ] ... # Samples: 12K of event 'cycles/no-inherit/' # Event count (approx.): 11895759282 ... # Samples: 24K of event 'instructions' # Event count (approx.): 30668000441 Enable inherit for one event when globally disable: # perf record -i -e cycles/inherit/ -e instructions ./a.out [ perf record: Woken up 7 times to write data ] [ perf record: Captured and wrote 1.654 MB perf.data (35868 samples) ] ... # Samples: 23K of event 'cycles/inherit/' # Event count (approx.): 23285400229 ... # Samples: 11K of event 'instructions' # Event count (approx.): 14969050259 Committer note: One can check if the bit was set, in addition to seeing the result in the perf.data file size as above by doing one of: # perf record -e cycles -e instructions -a usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.911 MB perf.data (63 samples) ] # perf evlist -v cycles: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1 instructions: size: 112, config: 0x1, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, freq: 1, sample_id_all: 1, exclude_guest: 1 # So, the inherit bit was set in both, now, if we disable it globally using --no-inherit: # perf record --no-inherit -e cycles -e instructions -a usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.910 MB perf.data (56 samples) ] # perf evlist -v cycles: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1 instructions: size: 112, config: 0x1, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, freq: 1, sample_id_all: 1, exclude_guest: 1 No inherit bit set, then disabling it and setting just on the cycles event: # perf record --no-inherit -e cycles/inherit/ -e instructions -a usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.909 MB perf.data (48 samples) ] # perf evlist -v cycles/inherit/: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1 instructions: size: 112, config: 0x1, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|ID|CPU|PERIOD, read_format: ID, disabled: 1, freq: 1, sample_id_all: 1, exclude_guest: 1 # We can see it as well in by using a more verbose level of debug messages in the tool that sets up the perf_event_attr, 'perf record' in this case: [root@zoo ~]# perf record -vv --no-inherit -e cycles/inherit/ -e instructions -a usleep 1 ------------------------------------------------------------ perf_event_attr: size 112 { sample_period, sample_freq } 4000 sample_type IP|TID|TIME|ID|CPU|PERIOD read_format ID disabled 1 inherit 1 mmap 1 comm 1 freq 1 task 1 sample_id_all 1 exclude_guest 1 mmap2 1 comm_exec 1 ------------------------------------------------------------ sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 sys_perf_event_open: pid -1 cpu 1 group_fd -1 flags 0x8 sys_perf_event_open: pid -1 cpu 2 group_fd -1 flags 0x8 sys_perf_event_open: pid -1 cpu 3 group_fd -1 flags 0x8 ------------------------------------------------------------ perf_event_attr: size 112 config 0x1 { sample_period, sample_freq } 4000 sample_type IP|TID|TIME|ID|CPU|PERIOD read_format ID disabled 1 freq 1 sample_id_all 1 exclude_guest 1 ------------------------------------------------------------ sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 Signed-off-by: Wang Nan Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: David S. Miller Cc: Li Zefan Cc: Peter Zijlstra Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1446029705-199659-2-git-send-email-wangnan0@huawei.com [ s/u64/bool/ for the perf_evsel_config_term inherit field - jolsa] Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Move id_offset out of struct perf_evsel union member

2015-10-27T18:04:29Z

Because the 'perf stat record' patches will use the id_offset member together with the priv pointer. Signed-off-by: Jiri Olsa Tested-by: Kan Liang Cc: David Ahern Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1445784728-21732-29-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf tools: Introduce 'P' modifier to request max precision

2015-10-05T19:21:11Z

The 'P' will cause the event to get maximum possible detected precise level. Following record: $ perf record -e cycles:P ... will detect maximum precise level for 'cycles' event and use it. Commiter note: Testing it: $ perf record -e cycles:P usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.013 MB perf.data (9 samples) ] $ perf evlist cycles:P $ perf evlist -v cycles:P: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 2, sample_id_all: 1, mmap2: 1, comm_exec: 1 $ Signed-off-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Don Zickus Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1444068369-20978-6-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo

Merge branch 'perf/urgent' into perf/core, to resolve a conflict

2015-09-16T07:19:56Z

Conflicts: tools/perf/ui/browsers/hists.c Signed-off-by: Ingo Molnar

perf evsel: Add own_cpus member

2015-09-15T13:41:13Z

perf_evlist__propagate_maps() cannot easily tell if an evsel has its own cpu map. To make that simpler, keep a copy of the PMU cpu map and adjust the propagation logic accordingly. Signed-off-by: Adrian Hunter Acked-by: Jiri Olsa Cc: Kan Liang Link: http://lkml.kernel.org/r/1441699142-18905-8-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Propagate error info from tp_format

2015-09-15T12:48:33Z

Propagate error info from tp_format via ERR_PTR to get it all the way down to the parse-event.c tracepoint adding routines. Following functions now return pointer with encoded error: - tp_format - trace_event__tp_format - perf_evsel__newtp_idx - perf_evsel__newtp This affects several other places in perf, that cannot use pointer check anymore, but must utilize the err.h interface, when getting error information from above functions list. Signed-off-by: Jiri Olsa Cc: David Ahern Cc: Matt Fleming Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Raphael Beamonte Link: http://lkml.kernel.org/r/1441615087-13886-5-git-send-email-jolsa@kernel.org [ Add two missing ERR_PTR() and one IS_ERR() ] Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Remove forward declaration of 'struct perf_evlist'

2015-09-14T15:50:22Z

We have no use for it in evsel.h. Tested-by: Wang Nan Cc: Adrian Hunter Cc: Borislav Petkov Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-um03yjrgyi3bj1hzqiqs4dsu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf evsel: Add a backpointer to the evlist a evsel is in

2015-08-28T17:53:49Z

So that functions that deal primarily with an evsel to access information that concerns the whole evlist it is in. Cc: Adrian Hunter Cc: Andi Kleen Cc: Andy Lutomirski Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1440677263-21954-5-git-send-email-kan.liang@intel.com Signed-off-by: Kan Liang Signed-off-by: Arnaldo Carvalho de Melo

perf callchain: Per-event type selection support

2015-08-12T16:20:27Z

This patchkit adds the ability to set callgraph mode (fp, dwarf, lbr) per event. This in term can reduce sampling overhead and the size of the perf.data. Here is an example. perf record -e 'cpu/cpu-cycles,period=1000,call-graph=fp,time=1/,cpu/instructions,call-graph=lbr/' sleep 1 perf evlist -v cpu/cpu-cycles,period=1000,call-graph=fp,time=1/: type: 4, size: 112, config: 0x3c, { sample_period, sample_freq }: 1000, sample_type: IP|TID|TIME|CALLCHAIN|PERIOD|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, mmap: 1, comm: 1, enable_on_exec: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1 cpu/instructions,call-graph=lbr/: type: 4, size: 112, config: 0xc0, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|CALLCHAIN|PERIOD|BRANCH_STACK|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, freq: 1, enable_on_exec: 1, sample_id_all: 1, exclude_guest: 1 Signed-off-by: Kan Liang Tested-by: Arnaldo Carvalho de Melo Cc: Andi Kleen Cc: Jiri Olsa Cc: Namhyung Kim Link: http://lkml.kernel.org/r/1439289050-40510-1-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo