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improved read cache memory utilization

This commit is contained in:
Arvid Norberg 2009-05-24 15:32:14 +00:00
parent a89d6cced1
commit 29d56f9a8b
2 changed files with 43 additions and 5 deletions
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2
include/libtorrent/disk_io_thread.hpp
View File

@ -308,7 +308,7 @@ namespace libtorrent
int cache_block(disk_io_job& j, mutex_t::scoped_lock& l);
// read cache operations
int clear_oldest_read_piece(cache_t::iterator ignore
int clear_oldest_read_piece(int num_blocks, cache_t::iterator ignore
, mutex_t::scoped_lock& l);
int read_into_piece(cached_piece_entry& p, int start_block
, int options, mutex_t::scoped_lock& l);

46
src/disk_io_thread.cpp
View File

@ -478,7 +478,8 @@ namespace libtorrent
// returns the number of blocks that were freed
int disk_io_thread::clear_oldest_read_piece(
cache_t::iterator ignore
int num_blocks
, cache_t::iterator ignore
, mutex_t::scoped_lock& l)
{
INVARIANT_CHECK;
@ -491,8 +492,44 @@ namespace libtorrent
{
// don't replace an entry that is less than one second old
if (time_now() - i->last_use < seconds(1)) return 0;
int blocks = free_piece(*i, l);
m_read_pieces.erase(i);
int blocks = 0;
if (num_blocks >= i->num_blocks)
{
blocks = free_piece(*i, l);
}
else
{
// delete blocks from the start and from the end
// until num_blocks have been freed
int end = (i->storage->info()->piece_size(i->piece) + m_block_size - 1) / m_block_size - 1;
int start = 0;
while (num_blocks)
{
while (i->blocks[start] == 0 && start <= end) ++start;
if (start > end) break;
free_buffer(i->blocks[start]);
i->blocks[start] = 0;
++blocks;
--i->num_blocks;
--m_cache_stats.cache_size;
--m_cache_stats.read_cache_size;
--num_blocks;
if (!num_blocks) break;
while (i->blocks[end] == 0 && start <= end) --end;
if (start > end) break;
free_buffer(i->blocks[end]);
i->blocks[end] = 0;
++blocks;
--i->num_blocks;
--m_cache_stats.cache_size;
--m_cache_stats.read_cache_size;
--num_blocks;
}
}
if (i->num_blocks == 0) m_read_pieces.erase(i);
return blocks;
}
return 0;
@ -555,7 +592,7 @@ namespace libtorrent
int ret = 0;
int tmp = 0;
do {
tmp = clear_oldest_read_piece(ignore, l);
tmp = clear_oldest_read_piece(blocks, ignore, l);
blocks -= tmp;
ret += tmp;
} while (tmp > 0 && blocks > 0);
@ -747,6 +784,7 @@ namespace libtorrent
++m_cache_stats.read_cache_size;
++end_block;
++num_read;
#error the length should be min(read_cache_line_size, (cache_size - in_use())/2)
if (num_read >= m_settings.read_cache_line_size) break;
}