Squashfs: Directly decompress into the page cache for file data

[pandora-kernel.git] / fs / squashfs / Kconfig

diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
index 159bd66..b6fa865 100644 (file)
--- a/fs/squashfs/Kconfig
+++ b/fs/squashfs/Kconfig
@@ -25,6 +25,34 @@ config SQUASHFS
 
          If unsure, say N.
 
+choice
+       prompt "File decompression options"
+       depends on SQUASHFS
+       help
+         Squashfs now supports two options for decompressing file
+         data.  Traditionally Squashfs has decompressed into an
+         intermediate buffer and then memcopied it into the page cache.
+         Squashfs now supports the ability to decompress directly into
+         the page cache.
+
+         If unsure, select "Decompress file data into an intermediate buffer"
+
+config SQUASHFS_FILE_CACHE
+       bool "Decompress file data into an intermediate buffer"
+       help
+         Decompress file data into an intermediate buffer and then
+         memcopy it into the page cache.
+
+config SQUASHFS_FILE_DIRECT
+       bool "Decompress files directly into the page cache"
+       help
+         Directly decompress file data into the page cache.
+         Doing so can significantly improve performance because
+         it eliminates a memcpy and it also removes the lock contention
+         on the single buffer.
+
+endchoice
+
 choice
        prompt "Decompressor parallelisation options"
        depends on SQUASHFS