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Changed gc_steps into a runtime parameter, better dedup mount gc

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So instead of configuring gc_steps at mount time (or eventually compile
time), lfsr_fs_gc now takes a steps parameter that controls how much gc
work to attempt:

  int lfsr_fs_gc(lfs_t *lfs, lfs_soff_t steps, uint32_t flags);

This API was needed internally to better deduplicate on-mount gc, and I
figured it might also be useful for users to be able to easily change
gc_steps per lfsr_fs_gc call.

I realize this could also be accomplished with the theoretical
lfsr_fs_gccfg, but it's a bit easier to not need a struct every call.

Most likely, depending on project/system, users will always call
lfsr_fs_gc with either 1 (minimal work) or -1 (maximal work), or, worst
case, can define a system-wide GC_STEPS somewhere.

---

Deduplicating on-mount gc work better saved some code, though it's worth
noting this could have been done internally and not exposed to users:

           code          stack
  before: 36476           2680 (+0.0%)
  after:  36316 (-0.4%)   2680 (+0.0%)
This commit is contained in:
Christopher Haster
2024-07-17 01:56:12 -05:00
parent 54ecc94702
commit eced943685
5 changed files with 163 additions and 222 deletions
Download Patch File Download Diff File Expand all files Collapse all files
runners/bench_runner.h
-2
View File
@@ -120,7 +120,6 @@ void bench_permutation(size_t i, uint32_t *buffer, size_t size);
BENCH_DEFINE(PCACHE_SIZE, LFS_MAX(16, PROG_SIZE) ) \
BENCH_DEFINE(FILE_BUFFER_SIZE, 16 ) \
BENCH_DEFINE(LOOKAHEAD_SIZE, 16 ) \
BENCH_DEFINE(GC_STEPS, 0 ) \
BENCH_DEFINE(GC_COMPACT_THRESH, 0 ) \
BENCH_DEFINE(INLINE_SIZE, BLOCK_SIZE/4 ) \
BENCH_DEFINE(SHRUB_SIZE, INLINE_SIZE ) \
@@ -150,7 +149,6 @@ void bench_permutation(size_t i, uint32_t *buffer, size_t size);
.pcache_size = PCACHE_SIZE, \
.file_buffer_size = FILE_BUFFER_SIZE, \
.lookahead_size = LOOKAHEAD_SIZE, \
.gc_steps = GC_STEPS, \
.gc_compact_thresh = GC_COMPACT_THRESH, \
.inline_size = INLINE_SIZE, \
.shrub_size = SHRUB_SIZE, \
runners/test_runner.h
-2
View File
@@ -105,7 +105,6 @@ void test_permutation(size_t i, uint32_t *buffer, size_t size);
TEST_DEFINE(PCACHE_SIZE, LFS_MAX(16, PROG_SIZE) ) \
TEST_DEFINE(FILE_BUFFER_SIZE, 16 ) \
TEST_DEFINE(LOOKAHEAD_SIZE, 16 ) \
TEST_DEFINE(GC_STEPS, 0 ) \
TEST_DEFINE(GC_COMPACT_THRESH, 0 ) \
TEST_DEFINE(INLINE_SIZE, BLOCK_SIZE/4 ) \
TEST_DEFINE(SHRUB_SIZE, INLINE_SIZE ) \
@@ -135,7 +134,6 @@ void test_permutation(size_t i, uint32_t *buffer, size_t size);
.pcache_size = PCACHE_SIZE, \
.file_buffer_size = FILE_BUFFER_SIZE, \
.lookahead_size = LOOKAHEAD_SIZE, \
.gc_steps = GC_STEPS, \
.gc_compact_thresh = GC_COMPACT_THRESH, \
.inline_size = INLINE_SIZE, \
.shrub_size = SHRUB_SIZE, \