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rt: Set the initial obstack size to 128 bytes

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Double the size on each allocation
This commit is contained in:
Brian Anderson 2011-12-25 19:18:02 -08:00
parent b3eb9a0031
commit b9b9b3e570
1 changed files with 10 additions and 5 deletions
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15
src/rt/rust_obstack.cpp
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@ -20,8 +20,8 @@
#undef DPRINT
#define DPRINT(fmt, ...)
//const size_t DEFAULT_CHUNK_SIZE = 4096;
const size_t DEFAULT_CHUNK_SIZE = 500000;
const size_t DEFAULT_CHUNK_SIZE = 128;
const size_t MAX_CHUNK_SIZE = (1024*64);
const size_t DEFAULT_ALIGNMENT = 16;
// A single type-tagged allocation in a chunk.
@ -42,7 +42,6 @@ rust_obstack_chunk::alloc(size_t len, type_desc *tydesc) {
if (sizeof(rust_obstack_alloc) + len > size - alen) {
DPRINT("Not enough space, len=%lu!\n", len);
assert(0); // FIXME
return NULL; // Not enough space.
}
@ -70,9 +69,15 @@ rust_obstack_chunk::mark() {
// Allocates the given number of bytes in a new chunk.
void *
rust_obstack::alloc_new(size_t len, type_desc *tydesc) {
size_t default_chunk_size = DEFAULT_CHUNK_SIZE;
if (chunk) {
default_chunk_size = std::min(chunk->size * 2, MAX_CHUNK_SIZE);
}
size_t chunk_size = std::max(sizeof(rust_obstack_alloc) + len,
DEFAULT_CHUNK_SIZE);
void *ptr = task->malloc(sizeof(chunk) + chunk_size, "obstack");
default_chunk_size);
void *ptr = task->malloc(sizeof(rust_obstack_chunk) + chunk_size,
"obstack");
DPRINT("making new chunk at %p, len %lu\n", ptr, chunk_size);
chunk = new(ptr) rust_obstack_chunk(chunk, chunk_size);
return chunk->alloc(len, tydesc);