CONFIG_FS_LITTLEFS_FC_HEAP_SIZE¶
Enable flexible file cache sizes for littlefs
Type: int
Help¶
littlefs requires a per-file buffer to cache data.
When applications customize littlefs configurations and support
different cache sizes for different partitions this preallocation is
inadequate as an application might require a small number of files
using a large cache size and a larger number of files using a
smaller cache size. In that case application should provide a
positive value for the heap size. Be aware that there is a
per-allocation overhead that affects how much usable space is
present in the heap.
If this option is set to a non-positive value the heap is sized to
support up to FS_LITTLE_FS_NUM_FILES blocks of
FS_LITTLEFS_CACHE_SIZE bytes.
Direct dependencies¶
FILE_SYSTEM_LITTLEFS && FILE_SYSTEM
(Includes any dependencies from ifs and menus.)
Default¶
0
Kconfig definition¶
At subsys/fs/Kconfig.littlefs:73
Included via Kconfig:8 → Kconfig.zephyr:44 → subsys/Kconfig:25 → subsys/fs/Kconfig:61
Menu path: (Top) → Sub Systems and OS Services → File Systems → File system support → LittleFS support
config FS_LITTLEFS_FC_HEAP_SIZE
int "Enable flexible file cache sizes for littlefs"
default 0
depends on FILE_SYSTEM_LITTLEFS && FILE_SYSTEM
help
littlefs requires a per-file buffer to cache data.
When applications customize littlefs configurations and support
different cache sizes for different partitions this preallocation is
inadequate as an application might require a small number of files
using a large cache size and a larger number of files using a
smaller cache size. In that case application should provide a
positive value for the heap size. Be aware that there is a
per-allocation overhead that affects how much usable space is
present in the heap.
If this option is set to a non-positive value the heap is sized to
support up to FS_LITTLE_FS_NUM_FILES blocks of
FS_LITTLEFS_CACHE_SIZE bytes.
(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)