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perf record: Apply filter to all events in a glob matching

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There is an old problem in perf's filter applying which first posted at
Sep. 2014 at https://lkml.org/lkml/2014/9/9/944 that, if passing
multiple events in a glob matching expression in cmdline then add
'--filter' after them, the filter will be applied on only the last one.

For example:

 # dd if=/dev/zero of=/dev/null &
 [1] 464
 # perf record -a -e 'syscalls:sys_*_read' --filter 'common_pid != 464' sleep 0.1
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.239 MB perf.data (2094 samples) ]
 # perf report --stdio | tee
 ...
 # Samples: 2K of event 'syscalls:sys_enter_read'
 # Event count (approx.): 2092
 ...
 # Samples: 2  of event 'syscalls:sys_exit_read'
 # Event count (approx.): 2
 ...

In this example, filter only applied on 'syscalls:sys_exit_read', and
there's no way to set filter for ''syscalls:sys_enter_read'.

This patch adds a 'cmdline_group_boundary' for 'struct evsel', and
apply filter on all events between two boundary marks.

After applying this patch:

 # perf record -a -e 'syscalls:sys_*_read' --filter 'common_pid != 464' sleep 0.1
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.031 MB perf.data (3 samples) ]
 # perf report --stdio | tee
 ...
 # Samples: 1  of event 'syscalls:sys_enter_read'
 # Event count (approx.): 1
 ...
 # Samples: 2  of event 'syscalls:sys_exit_read'
 # Event count (approx.): 2
 ...

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Reported-by: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1436513770-8896-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2015-07-10 07:36:09 +00:00 committed by Arnaldo Carvalho de Melo
parent 005438a8ee
commit 15bfd2cc10
3 changed files with 23 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/perf/util/evsel.c
View File

@ -210,6 +210,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
perf_evsel__object.init(evsel);
evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
perf_evsel__calc_id_pos(evsel);
evsel->cmdline_group_boundary = false;
}
struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)

1
tools/perf/util/evsel.h
View File

@ -86,6 +86,7 @@ struct perf_evsel {
unsigned long *per_pkg_mask;
struct perf_evsel *leader;
char *group_name;
bool cmdline_group_boundary;
};
union u64_swap {

14
tools/perf/util/parse-events.c
View File

@ -1065,8 +1065,13 @@ int parse_events(struct perf_evlist *evlist, const char *str,
perf_pmu__parse_cleanup();
if (!ret) {
int entries = data.idx - evlist->nr_entries;
struct perf_evsel *last;
perf_evlist__splice_list_tail(evlist, &data.list, entries);
evlist->nr_groups += data.nr_groups;
last = perf_evlist__last(evlist);
last->cmdline_group_boundary = true;
return 0;
}
@ -1171,6 +1176,7 @@ int parse_filter(const struct option *opt, const char *str,
if (evlist->nr_entries > 0)
last = perf_evlist__last(evlist);
do {
if (last == NULL || last->attr.type != PERF_TYPE_TRACEPOINT) {
fprintf(stderr,
"--filter option should follow a -e tracepoint option\n");
@ -1178,10 +1184,16 @@ int parse_filter(const struct option *opt, const char *str,
}
if (perf_evsel__set_filter(last, str) < 0) {
fprintf(stderr, "not enough memory to hold filter string\n");
fprintf(stderr,
"not enough memory to hold filter string\n");
return -1;
}
if (last->node.prev == &evlist->entries)
return 0;
last = list_entry(last->node.prev, struct perf_evsel, node);
} while (!last->cmdline_group_boundary);
return 0;
}