diff options
Diffstat (limited to 'fs/squashfs/Kconfig')
| -rw-r--r-- | fs/squashfs/Kconfig | 51 |
1 files changed, 46 insertions, 5 deletions
diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig index 916e78fabcaa..60fc98bdf421 100644 --- a/fs/squashfs/Kconfig +++ b/fs/squashfs/Kconfig @@ -54,9 +54,35 @@ config SQUASHFS_FILE_DIRECT endchoice +config SQUASHFS_DECOMP_SINGLE + depends on SQUASHFS + def_bool n + +config SQUASHFS_DECOMP_MULTI + depends on SQUASHFS + def_bool n + +config SQUASHFS_DECOMP_MULTI_PERCPU + depends on SQUASHFS + def_bool n + +config SQUASHFS_CHOICE_DECOMP_BY_MOUNT + bool "Select the parallel decompression mode during mount" + depends on SQUASHFS + default n + select SQUASHFS_DECOMP_SINGLE + select SQUASHFS_DECOMP_MULTI + select SQUASHFS_DECOMP_MULTI_PERCPU + select SQUASHFS_MOUNT_DECOMP_THREADS + help + Compile all parallel decompression modes and specify the + decompression mode by setting "threads=" during mount. + default Decompressor parallelisation is SQUASHFS_DECOMP_SINGLE + choice - prompt "Decompressor parallelisation options" + prompt "Select decompression parallel mode at compile time" depends on SQUASHFS + depends on !SQUASHFS_CHOICE_DECOMP_BY_MOUNT help Squashfs now supports three parallelisation options for decompression. Each one exhibits various trade-offs between @@ -64,15 +90,17 @@ choice If in doubt, select "Single threaded compression" -config SQUASHFS_DECOMP_SINGLE +config SQUASHFS_COMPILE_DECOMP_SINGLE bool "Single threaded compression" + select SQUASHFS_DECOMP_SINGLE help Traditionally Squashfs has used single-threaded decompression. Only one block (data or metadata) can be decompressed at any one time. This limits CPU and memory usage to a minimum. -config SQUASHFS_DECOMP_MULTI +config SQUASHFS_COMPILE_DECOMP_MULTI bool "Use multiple decompressors for parallel I/O" + select SQUASHFS_DECOMP_MULTI help By default Squashfs uses a single decompressor but it gives poor performance on parallel I/O workloads when using multiple CPU @@ -85,8 +113,9 @@ config SQUASHFS_DECOMP_MULTI decompressors per core. It dynamically allocates decompressors on a demand basis. -config SQUASHFS_DECOMP_MULTI_PERCPU +config SQUASHFS_COMPILE_DECOMP_MULTI_PERCPU bool "Use percpu multiple decompressors for parallel I/O" + select SQUASHFS_DECOMP_MULTI_PERCPU help By default Squashfs uses a single decompressor but it gives poor performance on parallel I/O workloads when using multiple CPU @@ -95,9 +124,21 @@ config SQUASHFS_DECOMP_MULTI_PERCPU This decompressor implementation uses a maximum of one decompressor per core. It uses percpu variables to ensure decompression is load-balanced across the cores. - endchoice +config SQUASHFS_MOUNT_DECOMP_THREADS + bool "Add the mount parameter 'threads=' for squashfs" + depends on SQUASHFS + depends on SQUASHFS_DECOMP_MULTI + default n + help + Use threads= to set the decompression parallel mode and the number of threads. + If SQUASHFS_CHOICE_DECOMP_BY_MOUNT=y + threads=<single|multi|percpu|1|2|3|...> + else + threads=<2|3|...> + The upper limit is num_online_cpus() * 2. + config SQUASHFS_XATTR bool "Squashfs XATTR support" depends on SQUASHFS |