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perf script: Add API for filtering via dynamically loaded shared object

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In some cases, users want to filter very large amounts of data (e.g.
from AUX area tracing like Intel PT) looking for something specific.
While scripting such as Python can be used, Python is 10 to 20 times
slower than C. So define a C API so that custom filters can be written
and loaded.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
2021-06-27 16:18:09 +03:00
committed by Arnaldo Carvalho de Melo
parent c435c166dc
commit 291961fc3c
7 changed files with 780 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
tools/perf/builtin-script.c
View File

@@ -55,6 +55,7 @@
#include <subcmd/pager.h>
#include <perf/evlist.h>
#include <linux/err.h>
#include "util/dlfilter.h"
#include "util/record.h"
#include "util/util.h"
#include "perf.h"
@@ -79,6 +80,7 @@ static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
static struct perf_stat_config stat_config;
static int max_blocks;
static bool native_arch;
static struct dlfilter *dlfilter;
unsigned int scripting_max_stack = PERF_MAX_STACK_DEPTH;
@@ -2175,6 +2177,7 @@ static int process_sample_event(struct perf_tool *tool,
struct perf_script *scr = container_of(tool, struct perf_script, tool);
struct addr_location al;
struct addr_location addr_al;
int ret = 0;
if (perf_time__ranges_skip_sample(scr->ptime_range, scr->range_num,
sample->time)) {
@@ -2213,6 +2216,13 @@ static int process_sample_event(struct perf_tool *tool,
if (evswitch__discard(&scr->evswitch, evsel))
goto out_put;
ret = dlfilter__filter_event(dlfilter, event, sample, evsel, machine, &al, &addr_al);
if (ret) {
if (ret > 0)
ret = 0;
goto out_put;
}
if (scripting_ops) {
struct addr_location *addr_al_ptr = NULL;
@@ -2229,7 +2239,7 @@ static int process_sample_event(struct perf_tool *tool,
out_put:
addr_location__put(&al);
return 0;
return ret;
}
static int process_attr(struct perf_tool *tool, union perf_event *event,
@@ -3568,6 +3578,7 @@ int cmd_script(int argc, const char **argv)
};
struct utsname uts;
char *script_path = NULL;
const char *dlfilter_file = NULL;
const char **__argv;
int i, j, err = 0;
struct perf_script script = {
@@ -3615,6 +3626,7 @@ int cmd_script(int argc, const char **argv)
parse_scriptname),
OPT_STRING('g', "gen-script", &generate_script_lang, "lang",
"generate perf-script.xx script in specified language"),
OPT_STRING(0, "dlfilter", &dlfilter_file, "file", "filter .so file name"),
OPT_STRING('i', "input", &input_name, "file", "input file name"),
OPT_BOOLEAN('d', "debug-mode", &debug_mode,
"do various checks like samples ordering and lost events"),
@@ -3933,6 +3945,12 @@ script_found:
exit(-1);
}
if (dlfilter_file) {
dlfilter = dlfilter__new(dlfilter_file);
if (!dlfilter)
return -1;
}
if (!script_name) {
setup_pager();
use_browser = 0;
@@ -4032,6 +4050,10 @@ script_found:
goto out_delete;
}
err = dlfilter__start(dlfilter, session);
if (err)
goto out_delete;
if (script_name) {
err = scripting_ops->start_script(script_name, argc, argv, session);
if (err)
@@ -4081,6 +4103,7 @@ out_delete:
if (script_started)
cleanup_scripting();
dlfilter__cleanup(dlfilter);
out:
return err;
}