string: factorize skip_spaces and export it to be generally available

[safe/jmp/linux-2.6] / kernel / Kconfig.hz

diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz
index 248e1c3..94fabd5 100644 (file)
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -7,7 +7,7 @@ choice
        default HZ_250
        help
         Allows the configuration of the timer frequency. It is customary
-        to have the timer interrupt run at 1000 HZ but 100 HZ may be more
+        to have the timer interrupt run at 1000 Hz but 100 Hz may be more
         beneficial for servers and NUMA systems that do not need to have
         a fast response for user interaction and that may experience bus
         contention and cacheline bounces as a result of timer interrupts.
@@ -19,21 +19,30 @@ choice
        config HZ_100
                bool "100 HZ"
        help
-         100 HZ is a typical choice for servers, SMP and NUMA systems
+         100 Hz is a typical choice for servers, SMP and NUMA systems
          with lots of processors that may show reduced performance if
          too many timer interrupts are occurring.
 
        config HZ_250
                bool "250 HZ"
        help
-        250 HZ is a good compromise choice allowing server performance
+        250 Hz is a good compromise choice allowing server performance
         while also showing good interactive responsiveness even
-        on SMP and NUMA systems.
+        on SMP and NUMA systems. If you are going to be using NTSC video
+        or multimedia, selected 300Hz instead.
+
+       config HZ_300
+               bool "300 HZ"
+       help
+        300 Hz is a good compromise choice allowing server performance
+        while also showing good interactive responsiveness even
+        on SMP and NUMA systems and exactly dividing by both PAL and
+        NTSC frame rates for video and multimedia work.
 
        config HZ_1000
                bool "1000 HZ"
        help
-        1000 HZ is the preferred choice for desktop systems and other
+        1000 Hz is the preferred choice for desktop systems and other
         systems requiring fast interactive responses to events.
 
 endchoice
@@ -42,5 +51,8 @@ config HZ
        int
        default 100 if HZ_100
        default 250 if HZ_250
+       default 300 if HZ_300
        default 1000 if HZ_1000
 
+config SCHED_HRTICK
+       def_bool HIGH_RES_TIMERS && (!SMP || USE_GENERIC_SMP_HELPERS)