1 files changed, 20 insertions, 9 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 4f55c736be11..5b448a74d0f7 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -47,18 +47,29 @@ config KPROBES
           If in doubt, say "N".
 
 config JUMP_LABEL
-       bool "Optimize trace point call sites"
+       bool "Optimize very unlikely/likely branches"
        depends on HAVE_ARCH_JUMP_LABEL
        help
+         This option enables a transparent branch optimization that
+         makes certain almost-always-true or almost-always-false branch
+         conditions even cheaper to execute within the kernel.
+
+         Certain performance-sensitive kernel code, such as trace points,
+         scheduler functionality, networking code and KVM have such
+         branches and include support for this optimization technique.
+
          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.
+         the kernel will compile such branches with just a nop
+         instruction. When the condition flag is toggled to true, the
+         nop will be converted to a jump instruction to execute the
+         conditional block of instructions.
+
+         This technique lowers overhead and stress on the branch prediction
+         of the processor and generally makes the kernel faster. The update
+         of the condition is slower, but those are always very rare.
+
+         ( On 32-bit x86, the necessary options added to the compiler
+           flags may increase the size of the kernel slightly. )
 
 config OPTPROBES
         def_bool y