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Added inline_max, to optionally limit the size of inlined files

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Inlined files live in metadata and decrease storage requirements, but
may be limited to improve metadata-related performance. This is
especially important given the current plague of metadata performance.

Though decreasing inline_max may make metadata more dense and increase
block usage, so it's important to benchmark if optimizing for speed.

The underlying limits of inlined files haven't changed:
1. Inlined files need to fit in RAM, so <= cache_size
2. Inlined files need to fit in a single attr, so <= attr_max
3. Inlined files need to fit in 1/8 of a block to avoid metadata
   overflow issues, this is after limiting by metadata_max,
   so <= min(metadata_max, block_size)/8

By default, the largest possible inline_max is used. This preserves
backwards compatibility and is probably a good default for most use
cases.

This does have the awkward effect of requiring inline_max=-1 to
indicate disabled inlined files, but I don't think there's a good
way around this.
This commit is contained in:
Christopher Haster
2023-12-20 22:56:26 -06:00
parent 09972a1710
commit 8b8fd14187
7 changed files with 79 additions and 25 deletions
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runners/bench_runner.h
+9 -6
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@@ -96,11 +96,12 @@ intmax_t bench_define(size_t define);
#define CACHE_SIZE_i 6
#define LOOKAHEAD_SIZE_i 7
#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 INLINE_MAX_i 9
#define BLOCK_CYCLES_i 10
#define ERASE_VALUE_i 11
#define ERASE_CYCLES_i 12
#define BADBLOCK_BEHAVIOR_i 13
#define POWERLOSS_BEHAVIOR_i 14
#define READ_SIZE bench_define(READ_SIZE_i)
#define PROG_SIZE bench_define(PROG_SIZE_i)
@@ -111,6 +112,7 @@ intmax_t bench_define(size_t define);
#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 INLINE_MAX bench_define(INLINE_MAX_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)
@@ -127,6 +129,7 @@ intmax_t bench_define(size_t define);
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(INLINE_MAX, 0) \
BENCH_DEF(BLOCK_CYCLES, -1) \
BENCH_DEF(ERASE_VALUE, 0xff) \
BENCH_DEF(ERASE_CYCLES, 0) \
@@ -134,7 +137,7 @@ 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 14
#define BENCH_IMPLICIT_DEFINE_COUNT 15
#endif