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Extended lfs_fs_gc to compact metadata, compact_thresh

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This extends lfs_fs_gc to now handle three things:

1. Calls mkconsistent if not already consistent
2. Compacts metadata > compact_thresh
3. Populates the block allocator

Which should be all of the janitorial work that can be done without
additional on-disk data structures.

Normally, metadata compaction occurs when an mdir is full, and results in
mdirs that are at most block_size/2.

Now, if you call lfs_fs_gc, littlefs will eagerly compact any mdirs that
exceed the compact_thresh configuration option. Because the resulting
mdirs are at most block_size/2, it only makes sense for compact_thresh to
be >= block_size/2 and <= block_size.

Additionally, there are some special values:

- compact_thresh=0  => defaults to ~88% block_size, may change
- compact_thresh=-1 => disables metadata compaction during lfs_fs_gc

Note that compact_thresh only affects lfs_fs_gc. Normal compactions
still only occur when full.
This commit is contained in:
Christopher Haster
2023-12-20 18:05:29 -06:00
parent 60567677b9
commit b5cd957f42
7 changed files with 147 additions and 56 deletions
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15
runners/bench_runner.h
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@@ -95,11 +95,12 @@ intmax_t bench_define(size_t define);
#define BLOCK_COUNT_i 5
#define CACHE_SIZE_i 6
#define LOOKAHEAD_SIZE_i 7
#define BLOCK_CYCLES_i 8
#define ERASE_VALUE_i 9
#define ERASE_CYCLES_i 10
#define BADBLOCK_BEHAVIOR_i 11
#define POWERLOSS_BEHAVIOR_i 12
#define COMPACT_THRESH_i 8
#define BLOCK_CYCLES_i 9
#define ERASE_VALUE_i 10
#define ERASE_CYCLES_i 11
#define BADBLOCK_BEHAVIOR_i 12
#define POWERLOSS_BEHAVIOR_i 13
#define READ_SIZE bench_define(READ_SIZE_i)
#define PROG_SIZE bench_define(PROG_SIZE_i)
@@ -109,6 +110,7 @@ intmax_t bench_define(size_t define);
#define BLOCK_COUNT bench_define(BLOCK_COUNT_i)
#define CACHE_SIZE bench_define(CACHE_SIZE_i)
#define LOOKAHEAD_SIZE bench_define(LOOKAHEAD_SIZE_i)
#define COMPACT_THRESH bench_define(COMPACT_THRESH_i)
#define BLOCK_CYCLES bench_define(BLOCK_CYCLES_i)
#define ERASE_VALUE bench_define(ERASE_VALUE_i)
#define ERASE_CYCLES bench_define(ERASE_CYCLES_i)
@@ -124,6 +126,7 @@ intmax_t bench_define(size_t define);
BENCH_DEF(BLOCK_COUNT, ERASE_COUNT/lfs_max(BLOCK_SIZE/ERASE_SIZE,1))\
BENCH_DEF(CACHE_SIZE, lfs_max(64,lfs_max(READ_SIZE,PROG_SIZE))) \
BENCH_DEF(LOOKAHEAD_SIZE, 16) \
BENCH_DEF(COMPACT_THRESH, 0) \
BENCH_DEF(BLOCK_CYCLES, -1) \
BENCH_DEF(ERASE_VALUE, 0xff) \
BENCH_DEF(ERASE_CYCLES, 0) \
@@ -131,7 +134,7 @@ intmax_t bench_define(size_t define);
BENCH_DEF(POWERLOSS_BEHAVIOR, LFS_EMUBD_POWERLOSS_NOOP)
#define BENCH_GEOMETRY_DEFINE_COUNT 4
#define BENCH_IMPLICIT_DEFINE_COUNT 13
#define BENCH_IMPLICIT_DEFINE_COUNT 14
#endif