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ccd26741f5
Perf record with verbose=2 already prints this information along with
whole lot of other traces which requires lot of scrolling. Introduce
an option to print only perf_event_open() arguments and return value.
Sample o/p:
$ perf --debug perf-event-open=1 record -- ls > /dev/null
------------------------------------------------------------
perf_event_attr:
size 112
{ sample_period, sample_freq } 4000
sample_type IP|TID|TIME|PERIOD
read_format ID
disabled 1
inherit 1
exclude_kernel 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 4308 cpu 0 group_fd -1 flags 0x8 = 4
sys_perf_event_open: pid 4308 cpu 1 group_fd -1 flags 0x8 = 5
sys_perf_event_open: pid 4308 cpu 2 group_fd -1 flags 0x8 = 6
sys_perf_event_open: pid 4308 cpu 3 group_fd -1 flags 0x8 = 8
sys_perf_event_open: pid 4308 cpu 4 group_fd -1 flags 0x8 = 9
sys_perf_event_open: pid 4308 cpu 5 group_fd -1 flags 0x8 = 10
sys_perf_event_open: pid 4308 cpu 6 group_fd -1 flags 0x8 = 11
sys_perf_event_open: pid 4308 cpu 7 group_fd -1 flags 0x8 = 12
------------------------------------------------------------
perf_event_attr:
type 1
size 112
config 0x9
watermark 1
sample_id_all 1
bpf_event 1
{ wakeup_events, wakeup_watermark } 1
------------------------------------------------------------
sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8
sys_perf_event_open failed, error -13
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.002 MB perf.data (9 samples) ]
Committer notes:
Just like the 'verbose' variable this new 'debug_peo_args' needs to be
added to util/python.c, since we don't link the debug.o file in the
python binding, which ended up making 'perf test python' fail with:
# perf test -v python
18: 'import perf' in python :
--- start ---
test child forked, pid 19237
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: /tmp/build/perf/python/perf.so: undefined symbol: debug_peo_args
test child finished with -1
---- end ----
'import perf' in python: FAILED!
#
After adding that new variable to util/python.c:
# perf test -v python
18: 'import perf' in python :
--- start ---
test child forked, pid 22364
test child finished with 0
---- end ----
'import perf' in python: Ok
#
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/20191108094128.28769-1-ravi.bangoria@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* For debugging general purposes */
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#ifndef __PERF_DEBUG_H
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#define __PERF_DEBUG_H
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#include <stdarg.h>
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#include <stdbool.h>
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#include <linux/compiler.h>
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extern int verbose;
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extern int debug_peo_args;
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extern bool quiet, dump_trace;
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extern int debug_ordered_events;
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extern int debug_data_convert;
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#ifndef pr_fmt
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#define pr_fmt(fmt) fmt
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#endif
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#define pr_err(fmt, ...) \
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eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_warning(fmt, ...) \
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eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_info(fmt, ...) \
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eprintf(0, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debug(fmt, ...) \
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eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debugN(n, fmt, ...) \
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eprintf(n, verbose, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debug2(fmt, ...) pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debug3(fmt, ...) pr_debugN(3, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_debug4(fmt, ...) pr_debugN(4, pr_fmt(fmt), ##__VA_ARGS__)
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/* Special macro to print perf_event_open arguments/return value. */
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#define pr_debug2_peo(fmt, ...) { \
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if (debug_peo_args) \
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pr_debugN(0, pr_fmt(fmt), ##__VA_ARGS__); \
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else \
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pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__); \
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}
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#define pr_time_N(n, var, t, fmt, ...) \
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eprintf_time(n, var, t, fmt, ##__VA_ARGS__)
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#define pr_oe_time(t, fmt, ...) pr_time_N(1, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_oe_time2(t, fmt, ...) pr_time_N(2, debug_ordered_events, t, pr_fmt(fmt), ##__VA_ARGS__)
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#define STRERR_BUFSIZE 128 /* For the buffer size of str_error_r */
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union perf_event;
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int dump_printf(const char *fmt, ...) __printf(1, 2);
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void trace_event(union perf_event *event);
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int ui__error(const char *format, ...) __printf(1, 2);
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int ui__warning(const char *format, ...) __printf(1, 2);
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void pr_stat(const char *fmt, ...);
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int eprintf(int level, int var, const char *fmt, ...) __printf(3, 4);
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int eprintf_time(int level, int var, u64 t, const char *fmt, ...) __printf(4, 5);
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int veprintf(int level, int var, const char *fmt, va_list args);
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int perf_debug_option(const char *str);
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void perf_debug_setup(void);
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int perf_quiet_option(void);
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void dump_stack(void);
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void sighandler_dump_stack(int sig);
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#endif /* __PERF_DEBUG_H */
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