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List:       linux-edac
Subject:    [PATCH 07/10] rasd: map the events buffers on all CPUs
From:       Jean Pihet <jean.pihet () linaro ! org>
Date:       2014-09-25 9:55:58
Message-ID: 1411638961-8112-7-git-send-email-jean.pihet () linaro ! org
[Download RAW message or body]

Allows multiple events to be read from all CPUs buffers

Signed-off-by: Jean Pihet <jean.pihet@linaro.org>
---
 src/rasd.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/src/rasd.c b/src/rasd.c
index 537cb65..221945e 100644
--- a/src/rasd.c
+++ b/src/rasd.c
@@ -47,15 +47,16 @@ static int add_tp_event(char *event_str)
 	struct perf_evsel *tp;
 	struct rasd_event *r_ev;
 	char **str = &event_str;
+	static int idx;
 	int ret;
 
 	if (extract_sys_name(str, &rasd.sys, &rasd.name))
 		err("invalid event specified, syntax is sys:name");
 
 	/* Initialize tracepoint evsel */
-	tp = perf_evsel__newtp_idx(rasd.sys, rasd.name, 0);
+	tp = perf_evsel__newtp_idx(rasd.sys, rasd.name, idx);
 	if (!tp)
-		err("init tracepoint evsel");
+		err("init tracepoint %d evsel", idx);
 
 	/*
 	 * Find the requested event from available events and fill the attr
@@ -70,20 +71,22 @@ static int add_tp_event(char *event_str)
 	case 0:
 		/* Add the event to the lists of events */
 		list_add_tail(&r_ev->node, &rasd.event_entries);
-		list_add_tail(&tp->node, &evlist->entries);
+		perf_evlist__add(evlist, tp);
 		break;
 	case -ENOMEM:
 		err("cannot allocate event path");
 		break;
 	case -ENODEV:
-		err("cannot open trace event id file");
+		err("cannot open tracepoint %d id file", idx);
 		break;
 	case -EINVAL:
 	default:
-		err("requested events not found, check the list of supported events");
+		err("requested tracepoint %d not found, check the list of supported events", idx);
 		break;
 	}
 
+	idx++;
+
 	if (ret) {
 		free(rasd.name);
 		free(rasd.sys);
@@ -144,23 +147,29 @@ int main()
 	evlist = perf_evlist__new();
 	if (!evlist)
 		err("allocating evlist");
+	evlist->cpus = cpu_map__new(NULL);
 
 	/* Read config file */
 	if (read_config_file())
 		err("error reading config file");
 
+	/* Open events */
 	evlist__for_each(evlist, c) {
 		/*
 		 * On all online cpus by default.
 		 */
-		if (perf_evsel__open(c, cpu_map__new(NULL), NULL) < 0)
+		if (perf_evsel__open(c, evlist->cpus, NULL) < 0)
 			err("opening tracepoint, are you root?");
 	}
 
+	/* mmap buffers */
 	if (perf_evlist__mmap(evlist, 4 /* opts->mmap_pages */, false) < 0)
 		err("Failed to mmap with %d (%s)\n", errno, strerror(errno));
 
-	/* mmap it and all that, consume it */
+	/* Enable at kernel level */
+	perf_evlist__enable(evlist);
+
+	/* Poll, read, consume etc. */
 
 	perf_evlist__delete(evlist);
 
-- 
1.9.3

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