logd: optimize code hotspots
Discovered that we had a few libc hotspots. Adjust code to generally
reduce or nullify the number of calls to malloc, free, strlen,
strcmp, strncmp, memcmp & strncasecmp. Total gain looks to be about
3% of logd's processing time. malloc still contributes to 3%, but all
others are now total 0.5%.
Bug: 23685592
Change-Id: Ife721121667969260cdb8b055524ae90f5911278
diff --git a/logd/LogUtils.h b/logd/LogUtils.h
index 117bc59..533eb1c 100644
--- a/logd/LogUtils.h
+++ b/logd/LogUtils.h
@@ -42,4 +42,21 @@
return (id != LOG_ID_CRASH) && (id != LOG_ID_KERNEL) && (id != LOG_ID_EVENTS);
}
+template <int (*cmp)(const char *l, const char *r, const size_t s)>
+static inline int fast(const char *l, const char *r, const size_t s) {
+ return (*l != *r) || cmp(l + 1, r + 1, s - 1);
+}
+
+template <int (*cmp)(const void *l, const void *r, const size_t s)>
+static inline int fast(const void *lv, const void *rv, const size_t s) {
+ const char *l = static_cast<const char *>(lv);
+ const char *r = static_cast<const char *>(rv);
+ return (*l != *r) || cmp(l + 1, r + 1, s - 1);
+}
+
+template <int (*cmp)(const char *l, const char *r)>
+static inline int fast(const char *l, const char *r) {
+ return (*l != *r) || cmp(l + 1, r + 1);
+}
+
#endif // _LOGD_LOG_UTILS_H__