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Subject[PATCH 27/30] perf probe: Introduce probe_conf global configs
Date
From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

Introduce probe_conf global configuration parameters for probe-event and
probe-finder, and removes related parameters from APIs.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150508010330.24812.21095.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-probe.c | 21 ++++++-----------
tools/perf/util/probe-event.c | 53 ++++++++++++++++++------------------------
tools/perf/util/probe-event.h | 13 +++++++----
tools/perf/util/probe-finder.c | 17 +++++++-------
tools/perf/util/probe-finder.h | 7 ++----
5 files changed, 48 insertions(+), 63 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 233f941..dbc998f 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -50,8 +50,6 @@
static struct {
int command; /* Command short_name */
bool list_events;
- bool force_add;
- bool show_ext_vars;
bool uprobes;
bool quiet;
bool target_used;
@@ -59,7 +57,6 @@ static struct {
struct perf_probe_event events[MAX_PROBES];
struct line_range line_range;
char *target;
- int max_probe_points;
struct strfilter *filter;
} params;

@@ -364,7 +361,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
#endif
opt_add_probe_event),
- OPT_BOOLEAN('f', "force", &params.force_add, "forcibly add events"
+ OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
" with existing name"),
#ifdef HAVE_DWARF_SUPPORT
OPT_CALLBACK('L', "line", NULL,
@@ -373,7 +370,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_CALLBACK('V', "vars", NULL,
"FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
"Show accessible variables on PROBEDEF", opt_show_vars),
- OPT_BOOLEAN('\0', "externs", &params.show_ext_vars,
+ OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
"Show external variables too (with --vars only)"),
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
@@ -384,7 +381,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
opt_set_target),
#endif
OPT__DRY_RUN(&probe_event_dry_run),
- OPT_INTEGER('\0', "max-probes", &params.max_probe_points,
+ OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
"Set how many probe points can be found for a probe."),
OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
"Show potential probe-able functions.",
@@ -440,8 +437,8 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
verbose = -1;
}

- if (params.max_probe_points == 0)
- params.max_probe_points = MAX_PROBES;
+ if (probe_conf.max_probes == 0)
+ probe_conf.max_probes = MAX_PROBES;

/*
* Only consider the user's kernel image path if given.
@@ -477,9 +474,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
NULL);

ret = show_available_vars(params.events, params.nevents,
- params.max_probe_points,
- params.filter,
- params.show_ext_vars);
+ params.filter);
if (ret < 0)
pr_err_with_code(" Error: Failed to show vars.", ret);
return ret;
@@ -498,9 +493,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
usage_with_options(probe_usage, options);
}

- ret = add_perf_probe_events(params.events, params.nevents,
- params.max_probe_points,
- params.force_add);
+ ret = add_perf_probe_events(params.events, params.nevents);
if (ret < 0) {
pr_err_with_code(" Error: Failed to add events.", ret);
return ret;
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b8fd48d..a7deda4 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -51,6 +51,7 @@
#define PERFPROBE_GROUP "probe"

bool probe_event_dry_run; /* Dry run flag */
+struct probe_conf probe_conf;

#define semantic_error(msg ...) pr_err("Semantic error :" msg)

@@ -599,8 +600,7 @@ static int post_process_probe_trace_events(struct probe_trace_event *tevs,

/* Try to find perf_probe_event with debuginfo */
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
- struct probe_trace_event **tevs,
- int max_tevs)
+ struct probe_trace_event **tevs)
{
bool need_dwarf = perf_probe_event_need_dwarf(pev);
struct perf_probe_point tmp;
@@ -617,13 +617,12 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,

pr_debug("Try to find probe point from debuginfo.\n");
/* Searching trace events corresponding to a probe event */
- ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
+ ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);

if (ntevs == 0) { /* Not found, retry with an alternative */
ret = get_alternative_probe_event(dinfo, pev, &tmp);
if (!ret) {
- ntevs = debuginfo__find_trace_events(dinfo, pev,
- tevs, max_tevs);
+ ntevs = debuginfo__find_trace_events(dinfo, pev, tevs);
/*
* Write back to the original probe_event for
* setting appropriate (user given) event name
@@ -821,8 +820,7 @@ int show_line_range(struct line_range *lr, const char *module, bool user)

static int show_available_vars_at(struct debuginfo *dinfo,
struct perf_probe_event *pev,
- int max_vls, struct strfilter *_filter,
- bool externs)
+ struct strfilter *_filter)
{
char *buf;
int ret, i, nvars;
@@ -836,13 +834,12 @@ static int show_available_vars_at(struct debuginfo *dinfo,
return -EINVAL;
pr_debug("Searching variables at %s\n", buf);

- ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
- max_vls, externs);
+ ret = debuginfo__find_available_vars_at(dinfo, pev, &vls);
if (!ret) { /* Not found, retry with an alternative */
ret = get_alternative_probe_event(dinfo, pev, &tmp);
if (!ret) {
ret = debuginfo__find_available_vars_at(dinfo, pev,
- &vls, max_vls, externs);
+ &vls);
/* Release the old probe_point */
clear_perf_probe_point(&tmp);
}
@@ -889,7 +886,7 @@ end:

/* Show available variables on given probe point */
int show_available_vars(struct perf_probe_event *pevs, int npevs,
- int max_vls, struct strfilter *_filter, bool externs)
+ struct strfilter *_filter)
{
int i, ret = 0;
struct debuginfo *dinfo;
@@ -907,8 +904,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
setup_pager();

for (i = 0; i < npevs && ret >= 0; i++)
- ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
- externs);
+ ret = show_available_vars_at(dinfo, &pevs[i], _filter);

debuginfo__delete(dinfo);
out:
@@ -927,8 +923,7 @@ find_perf_probe_point_from_dwarf(struct probe_trace_point *tp __maybe_unused,
}

static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
- struct probe_trace_event **tevs __maybe_unused,
- int max_tevs __maybe_unused)
+ struct probe_trace_event **tevs __maybe_unused)
{
if (perf_probe_event_need_dwarf(pev)) {
pr_warning("Debuginfo-analysis is not supported.\n");
@@ -947,9 +942,8 @@ int show_line_range(struct line_range *lr __maybe_unused,
}

int show_available_vars(struct perf_probe_event *pevs __maybe_unused,
- int npevs __maybe_unused, int max_vls __maybe_unused,
- struct strfilter *filter __maybe_unused,
- bool externs __maybe_unused)
+ int npevs __maybe_unused,
+ struct strfilter *filter __maybe_unused)
{
pr_warning("Debuginfo-analysis is not supported.\n");
return -ENOSYS;
@@ -2514,8 +2508,7 @@ void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
* Return an error or the number of found probe_trace_event
*/
static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
- struct probe_trace_event **tevs,
- int max_tevs)
+ struct probe_trace_event **tevs)
{
struct map *map = NULL;
struct ref_reloc_sym *reloc_sym = NULL;
@@ -2542,7 +2535,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev,
pev->target ? : "kernel");
ret = -ENOENT;
goto out;
- } else if (num_matched_functions > max_tevs) {
+ } else if (num_matched_functions > probe_conf.max_probes) {
pr_err("Too many functions matched in %s\n",
pev->target ? : "kernel");
ret = -E2BIG;
@@ -2634,8 +2627,7 @@ err_out:
bool __weak arch__prefers_symtab(void) { return false; }

static int convert_to_probe_trace_events(struct perf_probe_event *pev,
- struct probe_trace_event **tevs,
- int max_tevs)
+ struct probe_trace_event **tevs)
{
int ret;

@@ -2649,17 +2641,17 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
}

if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
- ret = find_probe_trace_events_from_map(pev, tevs, max_tevs);
+ ret = find_probe_trace_events_from_map(pev, tevs);
if (ret > 0)
return ret; /* Found in symbol table */
}

/* Convert perf_probe_event with debuginfo */
- ret = try_to_find_probe_trace_events(pev, tevs, max_tevs);
+ ret = try_to_find_probe_trace_events(pev, tevs);
if (ret != 0)
return ret; /* Found in debuginfo or got an error */

- return find_probe_trace_events_from_map(pev, tevs, max_tevs);
+ return find_probe_trace_events_from_map(pev, tevs);
}

struct __event_package {
@@ -2668,8 +2660,7 @@ struct __event_package {
int ntevs;
};

-int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
- int max_tevs, bool force_add)
+int add_perf_probe_events(struct perf_probe_event *pevs, int npevs)
{
int i, j, ret;
struct __event_package *pkgs;
@@ -2691,8 +2682,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
pkgs[i].pev = &pevs[i];
/* Convert with or without debuginfo */
ret = convert_to_probe_trace_events(pkgs[i].pev,
- &pkgs[i].tevs,
- max_tevs);
+ &pkgs[i].tevs);
if (ret < 0)
goto end;
pkgs[i].ntevs = ret;
@@ -2701,7 +2691,8 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
/* Loop 2: add all events */
for (i = 0; i < npevs; i++) {
ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
- pkgs[i].ntevs, force_add);
+ pkgs[i].ntevs,
+ probe_conf.force_add);
if (ret < 0)
break;
}
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index e3d9bb1..db9a9cb2 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -6,6 +6,13 @@
#include "strlist.h"
#include "strfilter.h"

+/* Probe related configurations */
+struct probe_conf {
+ bool show_ext_vars;
+ bool force_add;
+ int max_probes;
+};
+extern struct probe_conf probe_conf;
extern bool probe_event_dry_run;

/* kprobe-tracer and uprobe-tracer tracing point */
@@ -124,15 +131,13 @@ extern int line_range__init(struct line_range *lr);
/* Internal use: Return kernel/module path */
extern const char *kernel_get_module_path(const char *module);

-extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
- int max_probe_points, bool force_add);
+extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs);
extern int del_perf_probe_events(struct strfilter *filter);
extern int show_perf_probe_events(struct strfilter *filter);
extern int show_line_range(struct line_range *lr, const char *module,
bool user);
extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
- int max_probe_points, struct strfilter *filter,
- bool externs);
+ struct strfilter *filter);
extern int show_available_funcs(const char *module, struct strfilter *filter,
bool user);
bool arch__prefers_symtab(void);
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 63d3389..f4f5eed 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1214,15 +1214,15 @@ end:
/* Find probe_trace_events specified by perf_probe_event from debuginfo */
int debuginfo__find_trace_events(struct debuginfo *dbg,
struct perf_probe_event *pev,
- struct probe_trace_event **tevs, int max_tevs)
+ struct probe_trace_event **tevs)
{
struct trace_event_finder tf = {
.pf = {.pev = pev, .callback = add_probe_trace_event},
- .mod = dbg->mod, .max_tevs = max_tevs};
+ .max_tevs = probe_conf.max_probes, .mod = dbg->mod};
int ret;

/* Allocate result tevs array */
- *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs);
+ *tevs = zalloc(sizeof(struct probe_trace_event) * tf.max_tevs);
if (*tevs == NULL)
return -ENOMEM;

@@ -1303,9 +1303,9 @@ static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf)
die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem);

/* Find external variables */
- if (!af->externs)
+ if (!probe_conf.show_ext_vars)
goto out;
- /* Don't need to search child DIE for externs. */
+ /* Don't need to search child DIE for external vars. */
af->child = false;
die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem);

@@ -1325,17 +1325,16 @@ out:
*/
int debuginfo__find_available_vars_at(struct debuginfo *dbg,
struct perf_probe_event *pev,
- struct variable_list **vls,
- int max_vls, bool externs)
+ struct variable_list **vls)
{
struct available_var_finder af = {
.pf = {.pev = pev, .callback = add_available_vars},
.mod = dbg->mod,
- .max_vls = max_vls, .externs = externs};
+ .max_vls = probe_conf.max_probes};
int ret;

/* Allocate result vls array */
- *vls = zalloc(sizeof(struct variable_list) * max_vls);
+ *vls = zalloc(sizeof(struct variable_list) * af.max_vls);
if (*vls == NULL)
return -ENOMEM;

diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index f53553d..bed8271 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -40,8 +40,7 @@ extern void debuginfo__delete(struct debuginfo *dbg);
/* Find probe_trace_events specified by perf_probe_event from debuginfo */
extern int debuginfo__find_trace_events(struct debuginfo *dbg,
struct perf_probe_event *pev,
- struct probe_trace_event **tevs,
- int max_tevs);
+ struct probe_trace_event **tevs);

/* Find a perf_probe_point from debuginfo */
extern int debuginfo__find_probe_point(struct debuginfo *dbg,
@@ -55,8 +54,7 @@ extern int debuginfo__find_line_range(struct debuginfo *dbg,
/* Find available variables */
extern int debuginfo__find_available_vars_at(struct debuginfo *dbg,
struct perf_probe_event *pev,
- struct variable_list **vls,
- int max_points, bool externs);
+ struct variable_list **vls);

/* Find a src file from a DWARF tag path */
int get_real_path(const char *raw_path, const char *comp_dir,
@@ -99,7 +97,6 @@ struct available_var_finder {
struct variable_list *vls; /* Found variable lists */
int nvls; /* Number of variable lists */
int max_vls; /* Max no. of variable lists */
- bool externs; /* Find external vars too */
bool child; /* Search child scopes */
};

--
2.1.0


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