LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Paul Mackerras <paulus@samba.org>
Cc: dev@codyps.com, peterz@infradead.org, hbabu@us.ibm.com,
	<linux-kernel@vger.kernel.org>,
	linuxppc-dev@lists.ozlabs.org
Subject: [PATCH v7 1/4] tools/perf: support parsing parameterized events
Date: Wed,  7 Jan 2015 17:13:50 -0800	[thread overview]
Message-ID: <1420679633-28856-2-git-send-email-sukadev@linux.vnet.ibm.com> (raw)
In-Reply-To: <1420679633-28856-1-git-send-email-sukadev@linux.vnet.ibm.com>

From: Cody P Schafer <cody@linux.vnet.ibm.com>

Enable event specification like:

	pmu/event_name,param1=0x1,param2=0x4/

Assuming that

	/sys/bus/event_source/devices/pmu/events/event_name

Contains something like

	param2=?,bar=1,param1=?

CC: Haren Myneni <hbabu@us.ibm.com>
CC: Cody P Schafer <dev@codyps.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
---
Changelog[v6]:
	[Jiri Olsa] Add a check to make sure that sysfs entries have with
	parameters exactly match '=?'.

Changelog[v4]:
	[Jiri Olsa] Merge to recent perf-core and fix a small conflict.

Changelog[v3]:
	[Jiri Olsa] If the sysfs event file specifies 'param=val', make the
	usage 'hv_24x7/event,param=123/' rather than 'hv_24x7/event,val=123/'.

 tools/perf/util/parse-events.h |  1 +
 tools/perf/util/pmu.c          | 74 +++++++++++++++++++++++++++++++++++-------
 2 files changed, 64 insertions(+), 11 deletions(-)

diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index db2cf78..ca226ce 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -71,6 +71,7 @@ struct parse_events_term {
 	int type_val;
 	int type_term;
 	struct list_head list;
+	bool used;
 };
 
 struct parse_events_evlist {
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 5c9c494..bfbecf7 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -551,31 +551,68 @@ static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 }
 
 /*
+ * Term is a string term, and might be a param-term. Try to look up it's value
+ * in the remaining terms.
+ * - We have a term like "base-or-format-term=param-term",
+ * - We need to find the value supplied for "param-term" (with param-term named
+ *   in a config string) later on in the term list.
+ */
+static int pmu_resolve_param_term(struct parse_events_term *term,
+				  struct list_head *head_terms,
+				  __u64 *value)
+{
+	struct parse_events_term *t;
+
+	list_for_each_entry(t, head_terms, list) {
+		if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
+			if (!strcmp(t->config, term->config)) {
+				t->used = true;
+				*value = t->val.num;
+				return 0;
+			}
+		}
+	}
+
+	if (verbose)
+		printf("Required parameter '%s' not specified\n", term->config);
+
+	return -1;
+}
+
+/*
  * Setup one of config[12] attr members based on the
  * user input data - term parameter.
  */
 static int pmu_config_term(struct list_head *formats,
 			   struct perf_event_attr *attr,
 			   struct parse_events_term *term,
+			   struct list_head *head_terms,
 			   bool zero)
 {
 	struct perf_pmu_format *format;
 	__u64 *vp;
+	__u64 val;
+
+	/*
+	 * If this is a parameter we've already used for parameterized-eval,
+	 * skip it in normal eval.
+	 */
+	if (term->used)
+		return 0;
 
 	/*
-	 * Support only for hardcoded and numnerial terms.
 	 * Hardcoded terms should be already in, so nothing
 	 * to be done for them.
 	 */
 	if (parse_events__is_hardcoded_term(term))
 		return 0;
 
-	if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
-		return -EINVAL;
-
 	format = pmu_find_format(formats, term->config);
-	if (!format)
+	if (!format) {
+		if (verbose)
+			printf("Invalid event/parameter '%s'\n", term->config);
 		return -EINVAL;
+	}
 
 	switch (format->value) {
 	case PERF_PMU_FORMAT_VALUE_CONFIG:
@@ -592,11 +629,25 @@ static int pmu_config_term(struct list_head *formats,
 	}
 
 	/*
-	 * XXX If we ever decide to go with string values for
-	 * non-hardcoded terms, here's the place to translate
-	 * them into value.
+	 * Either directly use a numeric term, or try to translate string terms
+	 * using event parameters.
 	 */
-	pmu_format_value(format->bits, term->val.num, vp, zero);
+	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
+		val = term->val.num;
+	else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
+		if (strcmp(term->val.str, "?")) {
+			if (verbose)
+				pr_info("Invalid sysfs entry %s=%s\n",
+						term->config, term->val.str);
+			return -EINVAL;
+		}
+
+		if (pmu_resolve_param_term(term, head_terms, &val))
+			return -EINVAL;
+	} else
+		return -EINVAL;
+
+	pmu_format_value(format->bits, val, vp, zero);
 	return 0;
 }
 
@@ -607,9 +658,10 @@ int perf_pmu__config_terms(struct list_head *formats,
 {
 	struct parse_events_term *term;
 
-	list_for_each_entry(term, head_terms, list)
-		if (pmu_config_term(formats, attr, term, zero))
+	list_for_each_entry(term, head_terms, list) {
+		if (pmu_config_term(formats, attr, term, head_terms, zero))
 			return -EINVAL;
+	}
 
 	return 0;
 }
-- 
1.8.3.1


  reply	other threads:[~2015-01-08  1:15 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-08  1:13 [PATCH v7 0/4] Add support for parametrized events Sukadev Bhattiprolu
2015-01-08  1:13 ` Sukadev Bhattiprolu [this message]
2015-01-28 15:05   ` [tip:perf/core] perf tools: Support parsing parameterized events tip-bot for Cody P Schafer
2015-01-08  1:13 ` [PATCH v7 2/4] tools/perf: extend format_alias() to include event parameters Sukadev Bhattiprolu
2015-01-28 15:05   ` [tip:perf/core] perf tools: Extend " tip-bot for Cody P Schafer
2015-01-08  1:13 ` [PATCH v7 3/4] perf Documentation: add " Sukadev Bhattiprolu
2015-01-28 15:05   ` [tip:perf/core] perf Documentation: Add " tip-bot for Cody P Schafer
2015-01-08  1:13 ` [PATCH v7 4/4] tools/perf: Document parameterized and symbolic events Sukadev Bhattiprolu
2015-01-28 15:06   ` [tip:perf/core] perf tools: " tip-bot for Cody P Schafer
2015-01-08  9:54 ` [PATCH v7 0/4] Add support for parametrized events Jiri Olsa
2015-01-12 14:18   ` Arnaldo Carvalho de Melo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1420679633-28856-2-git-send-email-sukadev@linux.vnet.ibm.com \
    --to=sukadev@linux.vnet.ibm.com \
    --cc=acme@kernel.org \
    --cc=dev@codyps.com \
    --cc=hbabu@us.ibm.com \
    --cc=jolsa@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=paulus@samba.org \
    --cc=peterz@infradead.org \
    --subject='Re: [PATCH v7 1/4] tools/perf: support parsing parameterized events' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).