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[PATCH perf/core v13 01/15] perf probe: Use cache entry if possible

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  [PATCH perf/core v13 01/15] perf probe: Use cache entry if possible Masami Hiramatsu <mhiramat@kernel.org> - 2016-07-01 10:20 +0200
    Re: [PATCH perf/core v13 01/15] perf probe: Use cache entry if  possible Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-01 15:30 +0200
    [tip:perf/core] perf probe: Use cache entry if possible tip-bot for Masami Hiramatsu <tipbot@zytor.com> - 2016-07-05 12:20 +0200

#1435130 — [PATCH perf/core v13 01/15] perf probe: Use cache entry if possible

From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

Before analyzing debuginfo, try to find a corresponding entry
from probe cache always. This does not depend on --cache,
the --cache enables to store/update cache, but looking up
the cache is always enabled.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 Changes in v12:
  - Rename strlist__for_each to  strlist__for_each_entry.

 Changes in v6:
  - Remove fallback lookup routine by using function name
    as cached event name, because it should be done by following
    patch which supports %cached-event.
---
 tools/perf/util/probe-event.c |   65 ++++++++++++++++++++++++++++++++++++++++-
 tools/perf/util/probe-file.c  |   20 ++++++++++++-
 tools/perf/util/probe-file.h  |    5 +++
 3 files changed, 86 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 55f41d5..47b6b8b 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2474,17 +2474,24 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
 	char buf[64];
 	int ret;
 
+	/* If probe_event or trace_event already have the name, reuse it */
 	if (pev->event)
 		event = pev->event;
-	else
+	else if (tev->event)
+		event = tev->event;
+	else {
+		/* Or generate new one from probe point */
 		if (pev->point.function &&
 			(strncmp(pev->point.function, "0x", 2) != 0) &&
 			!strisglob(pev->point.function))
 			event = pev->point.function;
 		else
 			event = tev->point.realname;
+	}
 	if (pev->group)
 		group = pev->group;
+	else if (tev->group)
+		group = tev->group;
 	else
 		group = PERFPROBE_GROUP;
 
@@ -2531,7 +2538,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
 	for (i = 0; i < ntevs; i++) {
 		tev = &tevs[i];
 		/* Skip if the symbol is out of .text or blacklisted */
-		if (!tev->point.symbol)
+		if (!tev->point.symbol && !pev->uprobes)
 			continue;
 
 		/* Set new name for tev (and update namelist) */
@@ -2844,6 +2851,55 @@ errout:
 
 bool __weak arch__prefers_symtab(void) { return false; }
 
+static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
+					      struct probe_trace_event **tevs)
+{
+	struct probe_cache *cache;
+	struct probe_cache_entry *entry;
+	struct probe_trace_event *tev;
+	struct str_node *node;
+	int ret, i;
+
+	cache = probe_cache__new(pev->target);
+	if (!cache)
+		return 0;
+
+	entry = probe_cache__find(cache, pev);
+	if (!entry) {
+		ret = 0;
+		goto out;
+	}
+
+	ret = strlist__nr_entries(entry->tevlist);
+	if (ret > probe_conf.max_probes) {
+		pr_debug("Too many entries matched in the cache of %s\n",
+			 pev->target ? : "kernel");
+		ret = -E2BIG;
+		goto out;
+	}
+
+	*tevs = zalloc(ret * sizeof(*tev));
+	if (!*tevs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	i = 0;
+	strlist__for_each_entry(node, entry->tevlist) {
+		tev = &(*tevs)[i++];
+		ret = parse_probe_trace_command(node->s, tev);
+		if (ret < 0)
+			goto out;
+		/* Set the uprobes attribute as same as original */
+		tev->uprobes = pev->uprobes;
+	}
+	ret = i;
+
+out:
+	probe_cache__delete(cache);
+	return ret;
+}
+
 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
 					 struct probe_trace_event **tevs)
 {
@@ -2866,6 +2922,11 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
 	if (ret > 0)
 		return ret;
 
+	/* At first, we need to lookup cache entry */
+	ret = find_probe_trace_events_from_cache(pev, tevs);
+	if (ret > 0)
+		return ret;	/* Found in probe cache */
+
 	if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
 		ret = find_probe_trace_events_from_map(pev, tevs);
 		if (ret > 0)
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 1c12c1a..a94ee47 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -524,7 +524,7 @@ static bool streql(const char *a, const char *b)
 	return !strcmp(a, b);
 }
 
-static struct probe_cache_entry *
+struct probe_cache_entry *
 probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
 {
 	struct probe_cache_entry *entry = NULL;
@@ -548,6 +548,24 @@ found:
 	return entry;
 }
 
+struct probe_cache_entry *
+probe_cache__find_by_name(struct probe_cache *pcache,
+			  const char *group, const char *event)
+{
+	struct probe_cache_entry *entry = NULL;
+
+	list_for_each_entry(entry, &pcache->entries, node) {
+		/* Hit if same event name or same command-string */
+		if (streql(entry->pev.group, group) &&
+		    streql(entry->pev.event, event))
+			goto found;
+	}
+	entry = NULL;
+
+found:
+	return entry;
+}
+
 int probe_cache__add_entry(struct probe_cache *pcache,
 			   struct perf_probe_event *pev,
 			   struct probe_trace_event *tevs, int ntevs)
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index d872e3d..910aa74 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -38,5 +38,8 @@ int probe_cache__add_entry(struct probe_cache *pcache,
 int probe_cache__commit(struct probe_cache *pcache);
 void probe_cache__purge(struct probe_cache *pcache);
 void probe_cache__delete(struct probe_cache *pcache);
-
+struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
+					    struct perf_probe_event *pev);
+struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
+					const char *group, const char *event);
 #endif

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#1435335 — Re: [PATCH perf/core v13 01/15] perf probe: Use cache entry if possible

Em Fri, Jul 01, 2016 at 05:03:12PM +0900, Masami Hiramatsu escreveu:
> From: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> 
> Before analyzing debuginfo, try to find a corresponding entry
> from probe cache always. This does not depend on --cache,
> the --cache enables to store/update cache, but looking up
> the cache is always enabled.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> ---
>  Changes in v12:
>   - Rename strlist__for_each to  strlist__for_each_entry.
> 
>  Changes in v6:
>   - Remove fallback lookup routine by using function name
>     as cached event name, because it should be done by following
>     patch which supports %cached-event.

cool, keeping the entries for changes for this specific patch helps in
swapping back into my brain the history of this patch, helping in
re-re-re-re-reviewing 8-)

> ---
>  tools/perf/util/probe-event.c |   65 ++++++++++++++++++++++++++++++++++++++++-
>  tools/perf/util/probe-file.c  |   20 ++++++++++++-
>  tools/perf/util/probe-file.h  |    5 +++
>  3 files changed, 86 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 55f41d5..47b6b8b 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -2474,17 +2474,24 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
>  	char buf[64];
>  	int ret;
>  
> +	/* If probe_event or trace_event already have the name, reuse it */
>  	if (pev->event)
>  		event = pev->event;
> -	else
> +	else if (tev->event)
> +		event = tev->event;
> +	else {
> +		/* Or generate new one from probe point */
>  		if (pev->point.function &&
>  			(strncmp(pev->point.function, "0x", 2) != 0) &&
>  			!strisglob(pev->point.function))
>  			event = pev->point.function;
>  		else
>  			event = tev->point.realname;
> +	}
>  	if (pev->group)
>  		group = pev->group;
> +	else if (tev->group)
> +		group = tev->group;
>  	else
>  		group = PERFPROBE_GROUP;
>  
> @@ -2531,7 +2538,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
>  	for (i = 0; i < ntevs; i++) {
>  		tev = &tevs[i];
>  		/* Skip if the symbol is out of .text or blacklisted */
> -		if (!tev->point.symbol)
> +		if (!tev->point.symbol && !pev->uprobes)
>  			continue;
>  
>  		/* Set new name for tev (and update namelist) */
> @@ -2844,6 +2851,55 @@ errout:
>  
>  bool __weak arch__prefers_symtab(void) { return false; }
>  
> +static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
> +					      struct probe_trace_event **tevs)
> +{
> +	struct probe_cache *cache;
> +	struct probe_cache_entry *entry;
> +	struct probe_trace_event *tev;
> +	struct str_node *node;
> +	int ret, i;
> +
> +	cache = probe_cache__new(pev->target);
> +	if (!cache)
> +		return 0;
> +
> +	entry = probe_cache__find(cache, pev);
> +	if (!entry) {
> +		ret = 0;
> +		goto out;
> +	}
> +
> +	ret = strlist__nr_entries(entry->tevlist);
> +	if (ret > probe_conf.max_probes) {
> +		pr_debug("Too many entries matched in the cache of %s\n",
> +			 pev->target ? : "kernel");
> +		ret = -E2BIG;
> +		goto out;
> +	}
> +
> +	*tevs = zalloc(ret * sizeof(*tev));
> +	if (!*tevs) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	i = 0;
> +	strlist__for_each_entry(node, entry->tevlist) {
> +		tev = &(*tevs)[i++];
> +		ret = parse_probe_trace_command(node->s, tev);
> +		if (ret < 0)
> +			goto out;
> +		/* Set the uprobes attribute as same as original */
> +		tev->uprobes = pev->uprobes;
> +	}
> +	ret = i;
> +
> +out:
> +	probe_cache__delete(cache);
> +	return ret;
> +}
> +
>  static int convert_to_probe_trace_events(struct perf_probe_event *pev,
>  					 struct probe_trace_event **tevs)
>  {
> @@ -2866,6 +2922,11 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
>  	if (ret > 0)
>  		return ret;
>  
> +	/* At first, we need to lookup cache entry */
> +	ret = find_probe_trace_events_from_cache(pev, tevs);
> +	if (ret > 0)
> +		return ret;	/* Found in probe cache */
> +
>  	if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
>  		ret = find_probe_trace_events_from_map(pev, tevs);
>  		if (ret > 0)
> diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
> index 1c12c1a..a94ee47 100644
> --- a/tools/perf/util/probe-file.c
> +++ b/tools/perf/util/probe-file.c
> @@ -524,7 +524,7 @@ static bool streql(const char *a, const char *b)
>  	return !strcmp(a, b);
>  }
>  
> -static struct probe_cache_entry *
> +struct probe_cache_entry *
>  probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
>  {
>  	struct probe_cache_entry *entry = NULL;
> @@ -548,6 +548,24 @@ found:
>  	return entry;
>  }
>  
> +struct probe_cache_entry *
> +probe_cache__find_by_name(struct probe_cache *pcache,
> +			  const char *group, const char *event)
> +{
> +	struct probe_cache_entry *entry = NULL;
> +
> +	list_for_each_entry(entry, &pcache->entries, node) {
> +		/* Hit if same event name or same command-string */
> +		if (streql(entry->pev.group, group) &&
> +		    streql(entry->pev.event, event))
> +			goto found;
> +	}
> +	entry = NULL;
> +
> +found:
> +	return entry;
> +}
> +
>  int probe_cache__add_entry(struct probe_cache *pcache,
>  			   struct perf_probe_event *pev,
>  			   struct probe_trace_event *tevs, int ntevs)
> diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
> index d872e3d..910aa74 100644
> --- a/tools/perf/util/probe-file.h
> +++ b/tools/perf/util/probe-file.h
> @@ -38,5 +38,8 @@ int probe_cache__add_entry(struct probe_cache *pcache,
>  int probe_cache__commit(struct probe_cache *pcache);
>  void probe_cache__purge(struct probe_cache *pcache);
>  void probe_cache__delete(struct probe_cache *pcache);
> -
> +struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
> +					    struct perf_probe_event *pev);
> +struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
> +					const char *group, const char *event);
>  #endif

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#1436894 — [tip:perf/core] perf probe: Use cache entry if possible

Commit-ID:  bc0622302f344551050995491b7d14176f39c628
Gitweb:     http://git.kernel.org/tip/bc0622302f344551050995491b7d14176f39c628
Author:     Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
AuthorDate: Fri, 1 Jul 2016 17:03:12 +0900
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 1 Jul 2016 11:34:57 -0300

perf probe: Use cache entry if possible

Before analyzing debuginfo, try to find a corresponding entry from probe
cache always. This does not depend on --cache, the --cache enables to
store/update cache, but looking up the cache is always enabled.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/146736019226.27797.16366402884098398857.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/probe-event.c | 65 +++++++++++++++++++++++++++++++++++++++++--
 tools/perf/util/probe-file.c  | 20 ++++++++++++-
 tools/perf/util/probe-file.h  |  5 +++-
 3 files changed, 86 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 55f41d5..47b6b8b 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2474,17 +2474,24 @@ static int probe_trace_event__set_name(struct probe_trace_event *tev,
 	char buf[64];
 	int ret;
 
+	/* If probe_event or trace_event already have the name, reuse it */
 	if (pev->event)
 		event = pev->event;
-	else
+	else if (tev->event)
+		event = tev->event;
+	else {
+		/* Or generate new one from probe point */
 		if (pev->point.function &&
 			(strncmp(pev->point.function, "0x", 2) != 0) &&
 			!strisglob(pev->point.function))
 			event = pev->point.function;
 		else
 			event = tev->point.realname;
+	}
 	if (pev->group)
 		group = pev->group;
+	else if (tev->group)
+		group = tev->group;
 	else
 		group = PERFPROBE_GROUP;
 
@@ -2531,7 +2538,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
 	for (i = 0; i < ntevs; i++) {
 		tev = &tevs[i];
 		/* Skip if the symbol is out of .text or blacklisted */
-		if (!tev->point.symbol)
+		if (!tev->point.symbol && !pev->uprobes)
 			continue;
 
 		/* Set new name for tev (and update namelist) */
@@ -2844,6 +2851,55 @@ errout:
 
 bool __weak arch__prefers_symtab(void) { return false; }
 
+static int find_probe_trace_events_from_cache(struct perf_probe_event *pev,
+					      struct probe_trace_event **tevs)
+{
+	struct probe_cache *cache;
+	struct probe_cache_entry *entry;
+	struct probe_trace_event *tev;
+	struct str_node *node;
+	int ret, i;
+
+	cache = probe_cache__new(pev->target);
+	if (!cache)
+		return 0;
+
+	entry = probe_cache__find(cache, pev);
+	if (!entry) {
+		ret = 0;
+		goto out;
+	}
+
+	ret = strlist__nr_entries(entry->tevlist);
+	if (ret > probe_conf.max_probes) {
+		pr_debug("Too many entries matched in the cache of %s\n",
+			 pev->target ? : "kernel");
+		ret = -E2BIG;
+		goto out;
+	}
+
+	*tevs = zalloc(ret * sizeof(*tev));
+	if (!*tevs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	i = 0;
+	strlist__for_each_entry(node, entry->tevlist) {
+		tev = &(*tevs)[i++];
+		ret = parse_probe_trace_command(node->s, tev);
+		if (ret < 0)
+			goto out;
+		/* Set the uprobes attribute as same as original */
+		tev->uprobes = pev->uprobes;
+	}
+	ret = i;
+
+out:
+	probe_cache__delete(cache);
+	return ret;
+}
+
 static int convert_to_probe_trace_events(struct perf_probe_event *pev,
 					 struct probe_trace_event **tevs)
 {
@@ -2866,6 +2922,11 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
 	if (ret > 0)
 		return ret;
 
+	/* At first, we need to lookup cache entry */
+	ret = find_probe_trace_events_from_cache(pev, tevs);
+	if (ret > 0)
+		return ret;	/* Found in probe cache */
+
 	if (arch__prefers_symtab() && !perf_probe_event_need_dwarf(pev)) {
 		ret = find_probe_trace_events_from_map(pev, tevs);
 		if (ret > 0)
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 1c12c1a..a94ee47 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -524,7 +524,7 @@ static bool streql(const char *a, const char *b)
 	return !strcmp(a, b);
 }
 
-static struct probe_cache_entry *
+struct probe_cache_entry *
 probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
 {
 	struct probe_cache_entry *entry = NULL;
@@ -548,6 +548,24 @@ found:
 	return entry;
 }
 
+struct probe_cache_entry *
+probe_cache__find_by_name(struct probe_cache *pcache,
+			  const char *group, const char *event)
+{
+	struct probe_cache_entry *entry = NULL;
+
+	list_for_each_entry(entry, &pcache->entries, node) {
+		/* Hit if same event name or same command-string */
+		if (streql(entry->pev.group, group) &&
+		    streql(entry->pev.event, event))
+			goto found;
+	}
+	entry = NULL;
+
+found:
+	return entry;
+}
+
 int probe_cache__add_entry(struct probe_cache *pcache,
 			   struct perf_probe_event *pev,
 			   struct probe_trace_event *tevs, int ntevs)
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h
index d872e3d..910aa74 100644
--- a/tools/perf/util/probe-file.h
+++ b/tools/perf/util/probe-file.h
@@ -38,5 +38,8 @@ int probe_cache__add_entry(struct probe_cache *pcache,
 int probe_cache__commit(struct probe_cache *pcache);
 void probe_cache__purge(struct probe_cache *pcache);
 void probe_cache__delete(struct probe_cache *pcache);
-
+struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
+					    struct perf_probe_event *pev);
+struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
+					const char *group, const char *event);
 #endif

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