From: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Date: Tue, 17 Mar 2009 20:15:44 +0000 (+0100)
Subject: tracing: optimization of branch tracer
X-Git-Tag: v2.6.30-rc1~2^2~27^2~2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=97e7e4f391cac2b00417b581b432533d245d4fd0;p=karo-tx-linux.git

tracing: optimization of branch tracer

Impact: better performance for if branch tracer

Use an array to count the hit and misses of a conditional instead
of using another conditional. This cuts down on saturation of branch
predictions and increases performance of modern pipelined architectures.

Signed-off-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index d95da1020f1c..6faa7e549de4 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -68,6 +68,7 @@ struct ftrace_branch_data {
 			unsigned long miss;
 			unsigned long hit;
 		};
+		unsigned long miss_hit[2];
 	};
 };
 
@@ -125,10 +126,7 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
 				.line = __LINE__,			\
 			};						\
 		______r = !!(cond);					\
-		if (______r)						\
-			______f.hit++;					\
-		else							\
-			______f.miss++;					\
+		______f.miss_hit[______r]++;					\
 		______r;						\
 	}))
 #endif /* CONFIG_PROFILE_ALL_BRANCHES */