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[space-map-disk] Keep track of the allocated prefix so we can start searching in a better place.

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This commit is contained in:
Joe Thornber 2017-04-11 09:40:08 +01:00
parent 1a6b8bda3f
commit db44b5b928
1 changed files with 19 additions and 3 deletions
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22
persistent-data/space-maps/disk.cc
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@ -260,6 +260,7 @@ namespace {
indexes_(indexes),
nr_blocks_(0),
nr_allocated_(0),
search_start_(0),
ref_counts_(tm_, ref_count_traits::ref_counter()) {
}
@ -271,6 +272,7 @@ namespace {
indexes_(indexes),
nr_blocks_(root.nr_blocks_),
nr_allocated_(root.nr_allocated_),
search_start_(0),
ref_counts_(tm_, root.ref_count_root_, ref_count_traits::ref_counter()) {
}
@ -308,8 +310,11 @@ namespace {
if (old == 0)
nr_allocated_++;
else if (c == 0)
else if (c == 0) {
if (b < search_start_)
search_start_ = b;
nr_allocated_--;
}
}
void commit() {
@ -317,23 +322,31 @@ namespace {
}
void inc(block_address b) {
if (b == search_start_)
search_start_++;
// FIXME: 2 get_counts
ref_t old = get_count(b);
set_count(b, old + 1);
}
void dec(block_address b) {
// FIXME: 2 get_counts
ref_t old = get_count(b);
set_count(b, old - 1);
}
// FIXME: keep track of the lowest free block so we
// can start searching from a suitable place.
maybe_block find_free(span_iterator &it) {
for (maybe_span ms = it.first(); ms; ms = it.next()) {
block_address begin = ms->first;
block_address end = ms->second;
if (end < search_start_)
continue;
if (begin < search_start_)
begin = search_start_;
block_address begin_index = begin / ENTRIES_PER_BLOCK;
block_address end_index = div_up<block_address>(end, ENTRIES_PER_BLOCK);
@ -347,6 +360,8 @@ namespace {
boost::optional<unsigned> maybe_b = bm.find_free(bit_begin, bit_end);
if (maybe_b) {
block_address b = (index * ENTRIES_PER_BLOCK) + *maybe_b;
if (b)
search_start_ = b - 1;
return b;
}
}
@ -526,6 +541,7 @@ namespace {
index_store::ptr indexes_;
block_address nr_blocks_;
block_address nr_allocated_;
block_address search_start_;
btree<1, ref_count_traits> ref_counts_;
};