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prefetch btree nodes when walking a tree

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This commit is contained in:
Joe Thornber 2014-07-25 16:32:59 +01:00
parent 11469a2fda
commit ecb6bee2b2
4 changed files with 17 additions and 6 deletions
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6
persistent-data/block.h
View File

@ -55,11 +55,6 @@ namespace persistent_data {
unsigned max_concurrent_locks,
mode m);
enum block_type {
BT_SUPERBLOCK,
BT_NORMAL
};
typedef void (*put_behaviour_fn)(block_cache &, block_cache::block &);
class read_ref {
@ -142,6 +137,7 @@ namespace persistent_data {
block_address get_nr_blocks() const;
void prefetch(block_address b) const;
void flush() const;

7
persistent-data/block.tcc
View File

@ -270,6 +270,13 @@ namespace persistent_data {
return bc_.get_nr_blocks();
}
template <uint32_t BlockSize>
void
block_manager<BlockSize>::prefetch(block_address b) const
{
bc_.prefetch(b);
}
template <uint32_t BlockSize>
void
block_manager<BlockSize>::flush() const

6
persistent-data/data-structures/btree.tcc
View File

@ -827,7 +827,10 @@ namespace persistent_data {
// FIXME: use a switch statement
if (o.get_type() == INTERNAL) {
if (v.visit_internal(loc, o))
if (v.visit_internal(loc, o)) {
for (unsigned i = 0; i < o.get_nr_entries(); i++)
tm_->prefetch(o.value_at(i));
for (unsigned i = 0; i < o.get_nr_entries(); i++) {
node_location loc2(loc);
@ -836,6 +839,7 @@ namespace persistent_data {
walk_tree(v, loc2, o.value_at(i));
}
}
} else if (loc.path.size() < Levels - 1) {
if (v.visit_internal_leaf(loc, o))

4
persistent-data/transaction_manager.h
View File

@ -66,6 +66,10 @@ namespace persistent_data {
return bm_;
}
void prefetch(block_address b) {
bm_->prefetch(b);
}
private:
void add_shadow(block_address b);
void remove_shadow(block_address b);