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authorDrew Richardson <drew.richardson@arm.com>2013-03-26 12:00:00 -0700
committerDrew Richardson <drew.richardson@arm.com>2014-12-19 15:41:32 -0800
commit1b5637426bfc10a64571c81e24019032206d651b (patch)
tree71e362be9385179b545c77205cdab612a133ca86 /daemon/KMod.cpp
parenta01058e248133bb7c1ba0238ab380e4fac924e97 (diff)
downloadgator-1b5637426bfc10a64571c81e24019032206d651b.tar.gz
gator: Version 5.145.14
Signed-off-by: Drew Richardson <drew.richardson@arm.com>
Diffstat (limited to 'daemon/KMod.cpp')
-rw-r--r--daemon/KMod.cpp102
1 files changed, 102 insertions, 0 deletions
diff --git a/daemon/KMod.cpp b/daemon/KMod.cpp
new file mode 100644
index 0000000..5f12046
--- /dev/null
+++ b/daemon/KMod.cpp
@@ -0,0 +1,102 @@
+/**
+ * Copyright (C) ARM Limited 2013. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "KMod.h"
+
+#include <sys/types.h>
+#include <dirent.h>
+#include <unistd.h>
+
+#include "Collector.h"
+#include "Counter.h"
+#include "Logging.h"
+
+// Claim all the counters in /dev/gator/events
+bool KMod::claimCounter(const Counter &counter) const {
+ char text[128];
+ snprintf(text, sizeof(text), "/dev/gator/events/%s", counter.getType());
+ return access(text, F_OK) == 0;
+}
+
+void KMod::resetCounters() {
+ char base[128];
+ char text[128];
+
+ // Initialize all perf counters in the driver, i.e. set enabled to zero
+ struct dirent *ent;
+ DIR* dir = opendir("/dev/gator/events");
+ if (dir) {
+ while ((ent = readdir(dir)) != NULL) {
+ // skip hidden files, current dir, and parent dir
+ if (ent->d_name[0] == '.')
+ continue;
+ snprintf(base, sizeof(base), "/dev/gator/events/%s", ent->d_name);
+ snprintf(text, sizeof(text), "%s/enabled", base);
+ Collector::writeDriver(text, 0);
+ snprintf(text, sizeof(text), "%s/count", base);
+ Collector::writeDriver(text, 0);
+ }
+ closedir(dir);
+ }
+}
+
+void KMod::setupCounter(Counter &counter) {
+ char base[128];
+ char text[128];
+ snprintf(base, sizeof(base), "/dev/gator/events/%s", counter.getType());
+
+ snprintf(text, sizeof(text), "%s/enabled", base);
+ int enabled = true;
+ if (Collector::writeReadDriver(text, &enabled) || !enabled) {
+ counter.setEnabled(false);
+ return;
+ }
+
+ snprintf(text, sizeof(text), "%s/key", base);
+ int key;
+ Collector::readIntDriver(text, &key);
+ counter.setKey(key);
+
+ snprintf(text, sizeof(text), "%s/event", base);
+ Collector::writeDriver(text, counter.getEvent());
+ if (counter.isEBSCapable()) {
+ snprintf(text, sizeof(text), "%s/count", base);
+ if (access(text, F_OK) == 0) {
+ int count = counter.getCount();
+ if (Collector::writeReadDriver(text, &count) && counter.getCount() > 0) {
+ logg->logError(__FILE__, __LINE__, "Cannot enable EBS for %s:%s with a count of %d\n", counter.getTitle(), counter.getName(), counter.getCount());
+ handleException();
+ }
+ counter.setCount(count);
+ } else if (counter.getCount() > 0) {
+ logg->logError(__FILE__, __LINE__, "Event Based Sampling is only supported with kernel versions 3.0.0 and higher with CONFIG_PERF_EVENTS=y, and CONFIG_HW_PERF_EVENTS=y\n");
+ handleException();
+ }
+ }
+}
+
+void KMod::writeCounters(mxml_node_t *root) const {
+ struct dirent *ent;
+ mxml_node_t *counter;
+
+ // counters.xml is simply a file listing of /dev/gator/events
+ DIR* dir = opendir("/dev/gator/events");
+ if (dir == NULL) {
+ logg->logError(__FILE__, __LINE__, "Cannot create counters.xml since unable to read /dev/gator/events");
+ handleException();
+ }
+
+ while ((ent = readdir(dir)) != NULL) {
+ // skip hidden files, current dir, and parent dir
+ if (ent->d_name[0] == '.')
+ continue;
+ counter = mxmlNewElement(root, "counter");
+ mxmlElementSetAttr(counter, "name", ent->d_name);
+ }
+ closedir(dir);
+}