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Use much bigger hash tables for memory allocations now that we are

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allocating lots of small objects. Previous size was scaling poorly
and taking a lot of time to free, causing things like -listxml
and -validate to be a lot slower than before since the new 
driver_enumerator actually frees all of its memory at the end.

Also changed resource_pool to support a hash table size as input to
the constructor, which allows the global pool to be large, while
the machine-local pools can remain smaller.
This commit is contained in:
Aaron Giles 2011-04-19 15:08:42 +00:00
parent d3a1560433
commit a0647e8e68
2 changed files with 14 additions and 12 deletions
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19
src/emu/emualloc.c
View File

@ -87,7 +87,7 @@ public:
int m_line; // line number within that file
UINT64 m_id; // unique id
static const int k_hash_prime = 193;
static const int k_hash_prime = 6151;
static UINT64 s_curid; // current ID
static osd_lock * s_lock; // lock for managing the list
@ -113,7 +113,7 @@ private:
//**************************************************************************
// global resource pool to handle allocations outside of the emulator context
resource_pool global_resource_pool;
resource_pool global_resource_pool(6151);
// dummy zeromem object
const zeromem_t zeromem = { };
@ -246,12 +246,14 @@ void dump_unfreed_mem()
// pool
//-------------------------------------------------
resource_pool::resource_pool()
: m_listlock(osd_lock_alloc()),
resource_pool::resource_pool(int hash_size)
: m_hash_size(hash_size),
m_listlock(osd_lock_alloc()),
m_hash(new resource_pool_item *[hash_size]),
m_ordered_head(NULL),
m_ordered_tail(NULL)
{
memset(m_hash, 0, sizeof(m_hash));
memset(m_hash, 0, hash_size * sizeof(m_hash[0]));
}
@ -266,6 +268,7 @@ resource_pool::~resource_pool()
clear();
if (m_listlock != NULL)
osd_lock_free(m_listlock);
delete[] m_hash;
}
@ -278,7 +281,7 @@ void resource_pool::add(resource_pool_item &item)
osd_lock_acquire(m_listlock);
// insert into hash table
int hashval = reinterpret_cast<FPTR>(item.m_ptr) % k_hash_prime;
int hashval = reinterpret_cast<FPTR>(item.m_ptr) % m_hash_size;
item.m_next = m_hash[hashval];
m_hash[hashval] = &item;
@ -338,7 +341,7 @@ void resource_pool::remove(void *ptr)
// search for the item
osd_lock_acquire(m_listlock);
int hashval = reinterpret_cast<FPTR>(ptr) % k_hash_prime;
int hashval = reinterpret_cast<FPTR>(ptr) % m_hash_size;
for (resource_pool_item **scanptr = &m_hash[hashval]; *scanptr != NULL; scanptr = &(*scanptr)->m_next)
// must match the pointer
@ -379,7 +382,7 @@ resource_pool_item *resource_pool::find(void *ptr)
// search for the item
osd_lock_acquire(m_listlock);
int hashval = reinterpret_cast<FPTR>(ptr) % k_hash_prime;
int hashval = reinterpret_cast<FPTR>(ptr) % m_hash_size;
resource_pool_item *item;
for (item = m_hash[hashval]; item != NULL; item = item->m_next)
if (item->m_ptr == ptr)

7
src/emu/emualloc.h
View File

@ -277,7 +277,7 @@ private:
resource_pool &operator=(const resource_pool &);
public:
resource_pool();
resource_pool(int hash_size = 193);
~resource_pool();
void add(resource_pool_item &item);
@ -292,10 +292,9 @@ public:
template<class T> T *add_array(T* array, int count) { add(*EMUALLOC_SELF_NEW resource_pool_array<T>(array, count)); return array; }
private:
static const int k_hash_prime = 193;
int m_hash_size;
osd_lock * m_listlock;
resource_pool_item * m_hash[k_hash_prime];
resource_pool_item ** m_hash;
resource_pool_item * m_ordered_head;
resource_pool_item * m_ordered_tail;
};