X-Git-Url: https://bbs.cooldavid.org/git/?a=blobdiff_plain;f=arch%2FKconfig;h=8bf0fa652eb63c57dec1ebfec1a93a407be4ed32;hb=28cb6ccd2c7e86b3a4db94c7062cd27937bed424;hp=53d7f619a1b9b46643c59cd3c7d4ace354148c20;hpb=4f6876031ee105466f400661a0dd3fa66c4f0c09;p=net-next-2.6.git

diff --git a/arch/Kconfig b/arch/Kconfig
index 53d7f619a1b..8bf0fa652eb 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -42,6 +42,20 @@ config KPROBES
 	  for kernel debugging, non-intrusive instrumentation and testing.
 	  If in doubt, say "N".
 
+config JUMP_LABEL
+       bool "Optimize trace point call sites"
+       depends on HAVE_ARCH_JUMP_LABEL
+       help
+         If it is detected that the compiler has support for "asm goto",
+	 the kernel will compile trace point locations with just a
+	 nop instruction. When trace points are enabled, the nop will
+	 be converted to a jump to the trace function. This technique
+	 lowers overhead and stress on the branch prediction of the
+	 processor.
+
+	 On i386, options added to the compiler flags may increase
+	 the size of the kernel slightly.
+
 config OPTPROBES
 	def_bool y
 	depends on KPROBES && HAVE_OPTPROBES