rcu: Export rcu_scheduler_active

[karo-tx-linux.git] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index a23da9f0180341dd0cb8809f6108a2911336897a..42bf914b325af249784468022b70db98f54f0b7a 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -115,10 +115,13 @@ config HAVE_KERNEL_BZIP2
 config HAVE_KERNEL_LZMA
        bool
 
+config HAVE_KERNEL_LZO
+       bool
+
 choice
        prompt "Kernel compression mode"
        default KERNEL_GZIP
-       depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
+       depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_LZO
        help
          The linux kernel is a kind of self-extracting executable.
          Several compression algorithms are available, which differ
@@ -141,9 +144,8 @@ config KERNEL_GZIP
        bool "Gzip"
        depends on HAVE_KERNEL_GZIP
        help
-         The old and tried gzip compression. Its compression ratio is
-         the poorest among the 3 choices; however its speed (both
-         compression and decompression) is the fastest.
+         The old and tried gzip compression. It provides a good balance
+         between compression ratio and decompression speed.
 
 config KERNEL_BZIP2
        bool "Bzip2"
@@ -164,6 +166,14 @@ config KERNEL_LZMA
          two. Compression is slowest.  The kernel size is about 33%
          smaller with LZMA in comparison to gzip.
 
+config KERNEL_LZO
+       bool "LZO"
+       depends on HAVE_KERNEL_LZO
+       help
+         Its compression ratio is the poorest among the 4. The kernel
+         size is about about 10% bigger than gzip; however its speed
+         (both compression and decompression) is the fastest.
+
 endchoice
 
 config SWAP
@@ -386,6 +396,22 @@ config RCU_FANOUT_EXACT
 
          Say N if unsure.
 
+config RCU_FAST_NO_HZ
+       bool "Accelerate last non-dyntick-idle CPU's grace periods"
+       depends on TREE_RCU && NO_HZ && SMP
+       default n
+       help
+         This option causes RCU to attempt to accelerate grace periods
+         in order to allow the final CPU to enter dynticks-idle state
+         more quickly.  On the other hand, this option increases the
+         overhead of the dynticks-idle checking, particularly on systems
+         with large numbers of CPUs.
+
+         Say Y if energy efficiency is critically important, particularly
+               if you have relatively few CPUs.
+
+         Say N if you are unsure.
+
 config TREE_RCU_TRACE
        def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU )
        select DEBUG_FS