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Pack shaped run cache arenas in 4 KiB blocks

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I've been running with the shaped run cache and some extra logging,
decided to bump to a 4KiB slab. The theoretical and actual waste do show
up during use. My initial sizing was only a best guess based of glyph
cache and a 32 cell run typically fitting just below a 2KiB slab.
This commit is contained in:
Jesse Miller 2026-09-09 12:30:09 -06:00
parent e436d55b71
commit 9806100346
1 changed files with 4 additions and 2 deletions
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6
kitty/shaped-run-cache.c
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@ -14,6 +14,7 @@
#define SHAPED_RUN_MAX_ENTRIES 2048u
#define SHAPED_RUN_MAX_BYTES (1024u * 1024u)
#define SHAPED_RUN_MA_BLOCK_SIZE 16u
#define SHAPED_RUN_SLAB 4096u
typedef struct ShapedRunKey {
uint32_t keysz_in_bytes;
@ -56,11 +57,12 @@ static bool shaped_run_map_cmpr(KEY_TY a, KEY_TY b);
#define MA_NAME Key
#define MA_BLOCK_SIZE SHAPED_RUN_MA_BLOCK_SIZE
static_assert(MA_BLOCK_SIZE > sizeof(ShapedRunKey), "increase arena block size");
#define MA_ARENA_NUM_BLOCKS (2048u / MA_BLOCK_SIZE)
static_assert(SHAPED_RUN_SLAB % MA_BLOCK_SIZE == 0, "slab must be a multiple of the block size");
#define MA_ARENA_NUM_BLOCKS (SHAPED_RUN_SLAB / MA_BLOCK_SIZE)
#include "arena.h"
#define MA_NAME Val
#define MA_BLOCK_SIZE SHAPED_RUN_MA_BLOCK_SIZE
#define MA_ARENA_NUM_BLOCKS (2048u / MA_BLOCK_SIZE)
#define MA_ARENA_NUM_BLOCKS (SHAPED_RUN_SLAB / MA_BLOCK_SIZE)
#include "arena.h"
#include "kitty-verstable.h"