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Another experiment: store writes in mallocs

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This commit is contained in:
Vitaliy Filippov
2025-12-02 01:52:12 +03:00
parent 371e630f52
commit 1e5a01def8
4 changed files with 189 additions and 404 deletions
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src/blockstore/blockstore_heap.cpp
+154 -350
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@@ -16,7 +16,6 @@
#define BS_HEAP_FREE_MVCC 1
#define BS_HEAP_FREE_MAIN 2
#define FREE_SPACE_BIT 0x8000
#define GARBAGE_BIT ((uint64_t)1 << 63)
#define META_ALLOC_LEVELS 8
#define HEAP_INFLIGHT_DONE 1
@@ -24,32 +23,9 @@
#define HEAP_INFLIGHT_COMPACTED 4
#define HEAP_INFLIGHT_GC 8
uint64_t blockstore_heap_t::entry_pos(uint32_t block_num, uint32_t offset)
{
return (uint64_t)block_num*dsk->meta_block_size + offset + 1;
}
heap_entry_t *blockstore_heap_t::entry_from_pos(uint64_t entry_pos, bool allow_unallocated)
{
entry_pos = entry_pos & ~GARBAGE_BIT;
if (!entry_pos)
return NULL;
uint32_t block_num = entry_pos / dsk->meta_block_size;
auto & inf = block_info[block_num];
if (!inf.data && allow_unallocated)
return NULL;
assert(inf.data != NULL);
return (heap_entry_t*)(inf.data + (entry_pos % dsk->meta_block_size) - 1);
}
heap_entry_t *blockstore_heap_t::prev(heap_entry_t *wr)
{
// prev_pos = either <block_num * block_size + offset + 1> or <GARBAGE_BIT>
if (!(wr->prev_pos & ~GARBAGE_BIT))
{
return NULL;
}
return entry_from_pos(wr->prev_pos);
return wr->prev == (heap_entry_t*)1 ? NULL : wr->prev;
}
uint32_t blockstore_heap_t::get_simple_entry_size()
@@ -125,19 +101,19 @@ bool heap_entry_t::is_compactable()
entry_type == BS_HEAP_COMMIT || entry_type == BS_HEAP_ROLLBACK;
}
bool heap_entry_t::is_garbage()
{
return (prev_pos & GARBAGE_BIT);
}
bool heap_entry_t::is_before(heap_entry_t *other)
{
return lsn < other->lsn || lsn == other->lsn && !is_overwrite() && other->is_overwrite();
}
bool heap_entry_t::is_garbage()
{
return (uint64_t)prev == 1;
}
void heap_entry_t::set_garbage()
{
prev_pos |= GARBAGE_BIT;
prev = (heap_entry_t*)1;
}
uint8_t *heap_entry_t::get_ext_bitmap(blockstore_heap_t *heap)
@@ -190,12 +166,15 @@ void heap_entry_t::set_big_location(blockstore_heap_t *heap, uint64_t location)
uint32_t heap_entry_t::calc_crc32c()
{
auto old_crc32c = crc32c;
auto old_prev_pos = prev_pos;
auto old_block = block_num;
auto old_prev = prev;
block_num = 0;
prev = NULL;
crc32c = 0;
prev_pos = 0;
uint32_t res = ::crc32c(0, (uint8_t*)this, size);
block_num = old_block;
prev = old_prev;
crc32c = old_crc32c;
prev_pos = old_prev_pos;
return res;
}
@@ -233,9 +212,9 @@ blockstore_heap_t::~blockstore_heap_t()
{
for (auto & inf: block_info)
{
if (inf.data)
for (auto & entry: inf.entries)
{
free(inf.data);
free(entry);
}
}
block_info.clear();
@@ -302,6 +281,8 @@ int blockstore_heap_t::read_blocks(uint64_t disk_offset, uint64_t disk_size, uin
block_num, block_offset, expected_crc32c, wr->crc32c);
return EDOM;
}
wr->prev = NULL;
wr->block_num = block_num;
handle_write(wr);
block_offset += wr->size;
}
@@ -314,9 +295,10 @@ int blockstore_heap_t::load_blocks(uint64_t disk_offset, uint64_t size, uint8_t
{
entries_loaded = 0;
uint32_t used_space = 0;
uint32_t garbage_space = 0;
return read_blocks(disk_offset, size, buf, [&](heap_entry_t *wr)
return read_blocks(disk_offset, size, buf, [&](heap_entry_t *wr_orig)
{
heap_entry_t *wr = (heap_entry_t*)malloc_or_die(wr_orig->size);
memcpy(wr, wr_orig, wr_orig->size);
if (wr->lsn > next_lsn)
{
next_lsn = wr->lsn;
@@ -324,17 +306,14 @@ int blockstore_heap_t::load_blocks(uint64_t disk_offset, uint64_t size, uint8_t
entries_loaded++;
auto & inode_idx = block_index[get_pg_id(wr->inode, wr->stripe)][wr->inode];
auto & idx = inode_idx[wr->stripe];
const uint64_t wr_pos = (uint8_t*)wr - buf + disk_offset + 1;
idx.refcnt++;
if (!idx.pos)
if (!idx.ptr)
{
idx.pos = wr_pos;
idx.ptr = wr;
}
else
{
auto prev_wr = (idx.pos - idx.pos % dsk->meta_block_size) == disk_offset
? (heap_entry_t*)(buf + (idx.pos % dsk->meta_block_size) - 1)
: entry_from_pos(idx.pos, true);
auto prev_wr = idx.ptr;
if (!prev_wr || prev_wr->is_before(wr))
{
if (wr->is_overwrite())
@@ -342,27 +321,25 @@ int blockstore_heap_t::load_blocks(uint64_t disk_offset, uint64_t size, uint8_t
// Mark all previous entries as garbage
while (prev_wr)
{
auto prev_prev = entry_from_pos(prev_wr->prev_pos, true);
if (!prev_prev)
break;
prev_wr->prev_pos = 0;
auto prev_prev = prev(wr);
prev_wr->set_garbage();
block_info[prev_wr->block_num].has_garbage = true;
prev_wr = prev_prev;
}
wr->prev_pos = 0;
wr->prev = NULL;
}
else
{
wr->prev_pos = idx.pos;
wr->prev = idx.ptr;
}
// Insert <wr> on top
idx.pos = wr_pos;
idx.ptr = wr;
}
else
{
while (true)
{
auto prev_prev = entry_from_pos(prev_wr->prev_pos, true);
auto prev_prev = prev(prev_wr);
if (!prev_prev || prev_prev->is_before(wr))
{
break;
@@ -372,46 +349,30 @@ int blockstore_heap_t::load_blocks(uint64_t disk_offset, uint64_t size, uint8_t
if (prev_wr->is_overwrite())
{
// Mark <wr> as garbage
wr->prev_pos = 0;
wr->prev = NULL;
wr->set_garbage();
block_info[wr->block_num].has_garbage = true;
}
else
{
// Insert <wr> before <prev_wr>
wr->prev_pos = prev_wr->prev_pos;
prev_wr->prev_pos = wr_pos;
wr->prev = prev_wr->prev;
prev_wr->prev = wr;
}
}
}
used_space += wr->size;
if (wr->is_garbage())
if (!wr->is_garbage())
{
garbage_space += wr->size;
used_space += wr->size;
}
block_info[wr->block_num].entries.push_back(wr);
}, [&](uint32_t block_num, uint32_t last_offset, uint8_t *buf)
{
uint8_t *copy = NULL;
if (used_space > 0)
{
// Do not store free blocks in memory
copy = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk->meta_block_size);
memcpy(copy, buf, last_offset);
memset(copy+last_offset, 0, dsk->meta_block_size-last_offset);
if (last_offset <= dsk->meta_block_size-2)
{
*(uint16_t*)(copy+last_offset) = FREE_SPACE_BIT | (dsk->meta_block_size-last_offset);
}
}
block_info[block_num] = {
.data = copy,
};
modify_alloc(block_num, [&](heap_block_info_t & inf)
{
inf.used_space = used_space;
inf.garbage_space = garbage_space;
});
used_space = 0;
garbage_space = 0;
});
}
@@ -423,7 +384,7 @@ void blockstore_heap_t::fill_recheck_queue()
{
for (auto & op: ip.second)
{
auto wr = entry_from_pos(op.second.pos);
auto wr = op.second.ptr;
bool prev_intent = false;
while (wr)
{
@@ -448,7 +409,7 @@ void blockstore_heap_t::mark_used_blocks()
for (auto & op: ip.second)
{
bool added = false;
auto wr = entry_from_pos(op.second.pos);
auto wr = op.second.ptr;
while (wr)
{
if (wr->type() == BS_HEAP_SMALL_WRITE)
@@ -482,23 +443,28 @@ void blockstore_heap_t::recheck_buffer(heap_entry_t *cwr, uint8_t *buf)
{
// write entry is invalid, erase it and all newer entries
auto & inode_idx = block_index[get_pg_id(cwr->inode, cwr->stripe)][cwr->inode];
auto wr_pos = inode_idx[cwr->stripe].pos;
auto wr = entry_from_pos(wr_pos);
auto wr = inode_idx[cwr->stripe].ptr;
int rolled_back = 0;
auto free_entry = [&]()
{
uint32_t block_num = wr_pos / dsk->meta_block_size;
auto prev_pos = wr->prev_pos;
uint32_t block_num = wr->block_num;
auto prev = wr->prev;
auto wr_size = wr->size;
memset(wr, 0, wr_size);
wr->size = wr_size | FREE_SPACE_BIT;
free(wr);
modify_alloc(block_num, [&](heap_block_info_t & inf)
{
inf.used_space -= wr_size;
for (auto it = inf.entries.begin(); it != inf.entries.end(); it++)
{
if (*it == wr)
{
inf.entries.erase(it);
break;
}
}
});
recheck_modified_blocks.insert(block_num);
wr_pos = prev_pos;
wr = !wr_pos ? NULL : entry_from_pos(wr_pos);
wr = prev;
rolled_back++;
};
while (wr && wr != cwr)
@@ -507,11 +473,11 @@ void blockstore_heap_t::recheck_buffer(heap_entry_t *cwr, uint8_t *buf)
}
assert(wr == cwr);
// FIXME refcnt
if (wr->prev_pos)
if (wr->prev)
{
fprintf(stderr, "Notice: %u unfinished writes to %jx:%jx v%jx since lsn %ju, rolling back\n",
rolled_back+1, wr->inode, wr->stripe, prev(wr)->version, prev(wr)->lsn);
inode_idx[wr->stripe].pos = wr->prev_pos;
inode_idx[wr->stripe].ptr = wr->prev;
}
else
{
@@ -810,9 +776,10 @@ bool blockstore_heap_t::unlock_entry(object_id oid)
mvcc_it->second.readers--;
if (!mvcc_it->second.readers)
{
auto garbage_lsn = mvcc_it->second.garbage_lsn;
auto garbage_entry = mvcc_it->second.garbage_entry;
object_mvcc.erase(mvcc_it);
mark_garbage_up_to(oid, garbage_lsn);
if (garbage_entry)
mark_garbage_up_to(garbage_entry);
}
return true;
}
@@ -831,188 +798,16 @@ heap_entry_t *blockstore_heap_t::read_entry(object_id oid)
{
return NULL;
}
heap_entry_t *obj = entry_from_pos(stripe_it->second.pos);
assert(!obj || obj->inode == oid.inode && obj->stripe == oid.stripe);
return obj;
return stripe_it->second.ptr;
}
void blockstore_heap_t::defragment_block(uint32_t block_num)
{
auto & inf = block_info[block_num];
assert(inf.data);
uint8_t *new_data = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk->meta_block_size);
const uint8_t *end = inf.data+dsk->meta_block_size;
uint8_t *old = inf.data;
uint8_t *cur = new_data;
uint32_t removed_garbage = 0;
while (old <= end-2)
{
heap_entry_t *obj = (heap_entry_t *)old;
if (obj->size & FREE_SPACE_BIT) // FIXME & FREE_SPACE_BIT may be changed to entry_type == FREE_SPACE (?)
{
// free space
old += (obj->size & ~FREE_SPACE_BIT);
continue;
}
// object header
heap_entry_t *new_obj = (heap_entry_t *)cur;
object_id oid = (object_id){ .inode = obj->inode, .stripe = obj->stripe };
if (obj->is_garbage())
{
// old entry invalidated by a newer one, mark it as freeable on block write
// assign a 'virtual' LSN to track GC completion
assert(!inf.mod_lsn_to || inf.mod_lsn_to == next_lsn);
uint64_t gc_lsn = ++next_lsn;
inf.mod_lsn = inf.mod_lsn ? inf.mod_lsn : gc_lsn;
inf.mod_lsn_to = gc_lsn;
push_inflight_lsn(oid, gc_lsn, 0, HEAP_INFLIGHT_GC);
removed_garbage += obj->size;
old += obj->size;
continue;
}
else
{
// live entry, we need to change linked list pointer(s) to it
// but the change should be applied carefully, after copying all entries,
// because they may reference each other
uint64_t block_start = entry_pos(block_num, 0);
uint64_t old_pos = entry_pos(block_num, old - inf.data);
uint64_t new_pos = entry_pos(block_num, ((uint8_t*)new_obj - new_data));
auto & idx = block_index[get_pg_id(oid.inode, oid.stripe)][oid.inode][oid.stripe];
if (idx.pos == old_pos)
{
idx.pos = new_pos;
}
else
{
// entry is already moved if it's >= block_start and <= old_pos
heap_entry_t *wr = idx.pos >= block_start && idx.pos <= old_pos
? (heap_entry_t*)(new_data + (idx.pos % dsk->meta_block_size) - 1)
: entry_from_pos(idx.pos);
while (true)
{
assert(!(wr->prev_pos & GARBAGE_BIT));
if (!wr->prev_pos)
break;
if (wr->prev_pos == old_pos)
{
wr->prev_pos = new_pos;
break;
}
wr = wr->prev_pos >= block_start && wr->prev_pos <= old_pos
? (heap_entry_t*)(new_data + (wr->prev_pos % dsk->meta_block_size) - 1)
: entry_from_pos(wr->prev_pos);
}
}
}
memcpy(cur, obj, obj->size);
cur += obj->size;
old += obj->size;
}
if (cur != new_data+dsk->meta_block_size)
{
assert(cur <= new_data+dsk->meta_block_size-2);
*((uint16_t*)cur) = FREE_SPACE_BIT | (dsk->meta_block_size-(cur-new_data));
memset(cur+2, 0, dsk->meta_block_size-(cur-new_data)-2);
}
free(inf.data);
modify_alloc(block_num, [&](heap_block_info_t & inf)
{
assert(removed_garbage == inf.garbage_space);
inf.used_space -= inf.garbage_space;
inf.data = new_data;
inf.free_pos = cur-new_data;
inf.garbage_space = 0;
assert(inf.used_space == (cur-new_data));
});
}
uint32_t blockstore_heap_t::find_block_run(heap_block_info_t & inf, uint32_t space)
{
uint8_t *data = inf.data + inf.free_pos;
uint8_t *end = inf.data + dsk->meta_block_size;
uint8_t *last_free = NULL;
while (data <= end-2)
{
uint16_t region_marker = *((uint16_t*)data);
assert(region_marker);
if (region_marker & FREE_SPACE_BIT)
{
if (!last_free)
{
last_free = data;
}
else
{
// Merge free regions
*((uint16_t*)last_free) += (region_marker & ~FREE_SPACE_BIT);
*((uint16_t*)data) = 0;
inf.free_pos = last_free-inf.data;
}
uint16_t region_size = *((uint16_t*)last_free) & ~FREE_SPACE_BIT;
assert(last_free-inf.data+region_size <= dsk->meta_block_size);
if (region_size == space)
{
inf.free_pos = last_free-inf.data+space;
return last_free-inf.data;
}
else if (region_size >= space+2)
{
inf.free_pos = last_free-inf.data+space;
uint16_t *next_marker = (uint16_t*)(last_free+space);
*next_marker = FREE_SPACE_BIT | (region_size-space);
return last_free-inf.data;
}
}
else
{
last_free = NULL;
}
data += (region_marker & ~FREE_SPACE_BIT);
}
return UINT32_MAX;
}
uint32_t blockstore_heap_t::find_block_space(uint32_t block_num, uint32_t space, bool & defragmented)
{
auto & inf = block_info.at(block_num);
uint32_t free_pos = inf.free_pos;
uint32_t res = find_block_run(inf, space);
if (res != UINT32_MAX)
{
return res;
}
if (free_pos != 0)
{
inf.free_pos = 0;
res = find_block_run(inf, space);
if (res != UINT32_MAX)
{
return res;
}
}
defragmented = true;
defragment_block(block_num);
return find_block_run(inf, space);
}
void blockstore_heap_t::allocate_block(heap_block_info_t & inf)
{
if (!inf.data)
{
inf.data = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk->meta_block_size);
memset(inf.data, 0, dsk->meta_block_size);
*((uint16_t*)inf.data) = FREE_SPACE_BIT | dsk->meta_block_size;
}
}
int blockstore_heap_t::allocate_entry(uint32_t entry_size, uint32_t *block_num, uint32_t *offset, bool allow_last_free, bool & defragmented)
int blockstore_heap_t::allocate_entry(uint32_t entry_size, uint32_t *block_num, heap_entry_t **entry, bool allow_last_free)
{
if (last_allocated_block != UINT32_MAX)
{
// First try to write into the same block as the previous time
auto & inf = block_info.at(last_allocated_block);
auto free_space = dsk->meta_block_size - inf.used_space + inf.garbage_space;
auto free_space = dsk->meta_block_size - inf.used_space;
if (inf.is_writing || free_space < entry_size /* FIXME edge cases with +2? */ ||
// Do not allow to make the last non-nearfull block nearfull
!allow_last_free && meta_nearfull_blocks >= meta_block_count-1 &&
@@ -1023,34 +818,20 @@ int blockstore_heap_t::allocate_entry(uint32_t entry_size, uint32_t *block_num,
}
if (last_allocated_block == UINT32_MAX)
{
int i = 1;
for (; last_allocated_block == UINT32_MAX && i < META_ALLOC_LEVELS/2; i++)
int i;
for (i = 0; last_allocated_block == UINT32_MAX && i < META_ALLOC_LEVELS-1; i++)
{
// First try to write into used blocks with at least 1/2 free space
// First try to write into most free blocks
last_allocated_block = meta_alloc->find(i);
}
if (last_allocated_block == UINT32_MAX)
if (last_allocated_block != UINT32_MAX && i == META_ALLOC_LEVELS-1 && !allow_last_free && meta_nearfull_blocks >= meta_block_count-1)
{
// Then into empty blocks
last_allocated_block = meta_alloc->find(0);
}
if (last_allocated_block == UINT32_MAX)
{
for (; last_allocated_block == UINT32_MAX && i < META_ALLOC_LEVELS-1; i++)
// Do not allow to make the last non-nearfull block nearfull
auto & inf = block_info.at(last_allocated_block);
auto free_space = dsk->meta_block_size - inf.used_space;
if (free_space >= big_entry_size && free_space < big_entry_size+entry_size)
{
// Then into all other used blocks except nearfull
// Such blocks are still guaranteed to have at least <big_entry_size> free space
last_allocated_block = meta_alloc->find(i);
}
if (last_allocated_block != UINT32_MAX && i == META_ALLOC_LEVELS-1 && !allow_last_free && meta_nearfull_blocks >= meta_block_count-1)
{
// Do not allow to make the last non-nearfull block nearfull
auto & inf = block_info.at(last_allocated_block);
auto free_space = dsk->meta_block_size - inf.used_space + inf.garbage_space;
if (free_space >= big_entry_size && free_space < big_entry_size+entry_size)
{
last_allocated_block = UINT32_MAX;
}
last_allocated_block = UINT32_MAX;
}
}
if (last_allocated_block == UINT32_MAX && meta_nearfull.size() > 0)
@@ -1067,24 +848,46 @@ int blockstore_heap_t::allocate_entry(uint32_t entry_size, uint32_t *block_num,
// Then fail :)
return ENOSPC;
}
auto & inf = block_info.at(last_allocated_block);
allocate_block(inf);
}
if (!allow_last_free && meta_nearfull_blocks >= meta_block_count-1)
{
// Do not allow to make the last non-nearfull block nearfull
auto & inf = block_info.at(last_allocated_block);
if (dsk->meta_block_size-(inf.used_space-inf.garbage_space) >= big_entry_size &&
dsk->meta_block_size-(inf.used_space-inf.garbage_space+entry_size) < big_entry_size)
if (dsk->meta_block_size-inf.used_space >= big_entry_size &&
dsk->meta_block_size-inf.used_space+entry_size < big_entry_size)
{
last_allocated_block = UINT32_MAX;
return ENOSPC;
}
}
// Write into the same block
auto & inf = block_info.at(last_allocated_block);
if (inf.has_garbage)
{
size_t i = 0, j = 0;
for (; i < inf.entries.size(); i++)
{
if (inf.entries[i]->is_garbage())
{
// old entry invalidated by a newer one, mark it as freeable on block write
// assign a 'virtual' LSN to track GC completion
assert(!inf.mod_lsn_to || inf.mod_lsn_to == next_lsn);
uint64_t gc_lsn = ++next_lsn;
inf.mod_lsn = inf.mod_lsn ? inf.mod_lsn : gc_lsn;
inf.mod_lsn_to = gc_lsn;
push_inflight_lsn(gc_lsn, inf.entries[i], HEAP_INFLIGHT_GC);
}
else if (j != i)
{
inf.entries[j++] = inf.entries[i];
}
}
inf.entries.resize(j);
inf.has_garbage = false;
}
*block_num = last_allocated_block;
*offset = find_block_space(last_allocated_block, entry_size, defragmented);
assert(*offset != UINT32_MAX);
*entry = (heap_entry_t*)malloc_or_die(entry_size);
inf.entries.push_back(*entry);
modify_alloc(last_allocated_block, [&](heap_block_info_t & inf)
{
inf.used_space += entry_size;
@@ -1095,9 +898,9 @@ int blockstore_heap_t::allocate_entry(uint32_t entry_size, uint32_t *block_num,
int blockstore_heap_t::add_entry(uint32_t wr_size, heap_entry_t *old_head, uint32_t *modified_block,
bool allow_last_free, std::function<void(heap_entry_t *wr)> fill_entry)
{
uint32_t block_num, offset;
bool defragmented = false;
int res = allocate_entry(wr_size, &block_num, &offset, allow_last_free, defragmented);
heap_entry_t *new_wr = NULL;
uint32_t block_num;
int res = allocate_entry(wr_size, &block_num, &new_wr, allow_last_free);
if (res != 0)
{
return res;
@@ -1108,20 +911,18 @@ int blockstore_heap_t::add_entry(uint32_t wr_size, heap_entry_t *old_head, uint3
}
auto & inf = block_info.at(block_num);
assert(!inf.mod_lsn_to || inf.mod_lsn_to == next_lsn);
heap_entry_t *new_wr = (heap_entry_t *)(inf.data + offset);
new_wr->lsn = ++next_lsn;
fill_entry(new_wr);
inf.mod_lsn = inf.mod_lsn ? inf.mod_lsn : next_lsn;
inf.mod_lsn_to = next_lsn;
// Remember the object as dirty and remove older entries when this block is written and fsynced
auto oid = (object_id){ .inode = new_wr->inode, .stripe = new_wr->stripe };
push_inflight_lsn(oid, next_lsn, new_wr->lsn,
push_inflight_lsn(next_lsn, new_wr,
(new_wr->is_overwrite() ? HEAP_INFLIGHT_COMPACTED : 0) |
(new_wr->is_compactable() ? HEAP_INFLIGHT_COMPACTABLE : 0));
const uint64_t new_pos = entry_pos(block_num, offset);
auto & idx = block_index[get_pg_id(oid.inode, oid.stripe)][oid.inode][oid.stripe];
idx.refcnt++;
old_head = entry_from_pos(idx.pos);
old_head = idx.ptr;
if (old_head && !old_head->is_before(new_wr))
{
// BIG_WRITE may be inserted into the middle of the sequence during compaction
@@ -1140,14 +941,15 @@ int blockstore_heap_t::add_entry(uint32_t wr_size, heap_entry_t *old_head, uint3
assert(prev_wr && prev_wr->type() != BS_HEAP_DELETE &&
(prev_wr->type() != BS_HEAP_BIG_WRITE || prev_wr->version == new_wr->version));
// Insert <new_wr> between <next_wr> and <prev_wr>
new_wr->prev_pos = next_wr->prev_pos;
next_wr->prev_pos = new_pos;
new_wr->prev = next_wr->prev;
next_wr->prev = new_wr;
}
else
{
new_wr->prev_pos = idx.pos;
idx.pos = new_pos;
new_wr->prev = idx.ptr;
idx.ptr = new_wr;
}
new_wr->block_num = block_num;
new_wr->size = wr_size;
new_wr->crc32c = new_wr->calc_crc32c();
return 0;
@@ -1209,7 +1011,10 @@ int blockstore_heap_t::add_big_write(object_id oid, heap_entry_t *old_head, bool
memset(wr->get_int_bitmap(this), 0, dsk->clean_entry_bitmap_size);
bitmap_set(wr->get_int_bitmap(this), offset, len, dsk->bitmap_granularity);
if (dsk->data_csum_type)
{
memset(wr->get_checksums(this), 0, get_csum_size(wr));
calc_checksums(wr, (uint8_t*)data, true, offset, len);
}
});
}
@@ -1344,8 +1149,8 @@ int blockstore_heap_t::add_punch_holes(heap_entry_t *obj, uint64_t to_lsn, uint6
return ENOENT;
}
auto & idx = block_index[get_pg_id(obj->inode, obj->stripe)][obj->inode][obj->stripe];
assert(idx.pos);
uint32_t block_num = idx.pos / dsk->meta_block_size;
assert(idx.ptr);
uint32_t block_num = idx.ptr->block_num;
auto & inf = block_info.at(block_num);
if (inf.is_writing)
{
@@ -1483,28 +1288,28 @@ int blockstore_heap_t::add_delete(heap_entry_t *obj, uint32_t *modified_block)
uint32_t blockstore_heap_t::meta_alloc_pos(const heap_block_info_t & inf)
{
if (inf.is_writing || inf.used_space-inf.garbage_space > dsk->meta_block_size-sizeof(heap_entry_t))
if (inf.is_writing || inf.used_space > dsk->meta_block_size-sizeof(heap_entry_t))
{
// 100% full - no entry can be written into this block at all
return META_ALLOC_LEVELS;
}
if (inf.used_space-inf.garbage_space > dsk->meta_block_size-big_entry_size)
if (inf.used_space > dsk->meta_block_size-big_entry_size)
{
// nearfull - big_entries won't fit into this block so it can't be used for compaction
return META_ALLOC_LEVELS-1;
}
// normal block
return (inf.used_space-inf.garbage_space) / ((dsk->meta_block_size-big_entry_size) / (META_ALLOC_LEVELS-1));
return inf.used_space / ((dsk->meta_block_size-big_entry_size) / (META_ALLOC_LEVELS-1));
}
void blockstore_heap_t::modify_alloc(uint32_t block_num, std::function<void(heap_block_info_t &)> change_cb)
{
auto & inf = block_info.at(block_num);
uint32_t old_pos = meta_alloc_pos(inf);
uint32_t old_used = inf.used_space-inf.garbage_space;
uint32_t old_used = inf.used_space;
change_cb(inf);
uint32_t new_pos = meta_alloc_pos(inf);
uint32_t new_used = inf.used_space-inf.garbage_space;
uint32_t new_used = inf.used_space;
meta_alloc->change(block_num, old_pos, new_pos);
meta_used_space -= old_used;
meta_used_space += new_used;
@@ -1529,6 +1334,7 @@ void blockstore_heap_t::start_block_write(uint32_t block_num)
assert(!inf.is_writing);
inf.is_writing = true;
});
// FIXME also get_meta_block
}
void blockstore_heap_t::complete_block_write(uint32_t block_num)
@@ -1550,35 +1356,26 @@ void blockstore_heap_t::complete_block_write(uint32_t block_num)
}
}
void blockstore_heap_t::mark_garbage_up_to(object_id oid, uint64_t lsn)
void blockstore_heap_t::mark_garbage_up_to(heap_entry_t *wr)
{
auto mvcc_it = object_mvcc.find(oid);
auto mvcc_it = object_mvcc.find((object_id){ .inode = wr->inode, .stripe = wr->stripe });
if (mvcc_it != object_mvcc.end())
{
// Postpone until all readers complete
mvcc_it->second.garbage_lsn = mvcc_it->second.garbage_lsn < lsn ? lsn : mvcc_it->second.garbage_lsn;
auto & mvcc = mvcc_it->second;
mvcc.garbage_entry = !mvcc.garbage_entry || mvcc.garbage_entry->lsn < wr->lsn ? wr : mvcc.garbage_entry;
return;
}
heap_entry_t *wr = read_entry(oid);
while (wr && wr->lsn != lsn)
assert((wr->type() == BS_HEAP_BIG_WRITE || wr->type() == BS_HEAP_DELETE) && (wr->entry_type & BS_HEAP_STABLE));
uint32_t used_big = (wr->type() == BS_HEAP_BIG_WRITE ? wr->big().block_num : UINT32_MAX);
auto prev_wr = prev(wr);
wr->prev = NULL;
wr = prev_wr;
while (wr)
{
wr = prev(wr);
}
if (wr)
{
assert((wr->type() == BS_HEAP_BIG_WRITE || wr->type() == BS_HEAP_DELETE) && (wr->entry_type & BS_HEAP_STABLE));
uint32_t used_big = (wr->type() == BS_HEAP_BIG_WRITE ? wr->big().block_num : UINT32_MAX);
while (true)
{
auto prev_wr = prev(wr);
if (!prev_wr)
{
break;
}
mark_garbage(wr->prev_pos / dsk->meta_block_size, prev_wr, used_big);
wr->prev_pos = (wr->prev_pos & GARBAGE_BIT);
wr = prev_wr;
}
auto prev_wr = prev(wr);
mark_garbage(wr->block_num, wr, used_big);
wr = prev_wr;
}
}
@@ -1600,7 +1397,8 @@ void blockstore_heap_t::mark_garbage(uint32_t block_num, heap_entry_t *prev_wr,
}
modify_alloc(block_num, [&](heap_block_info_t & inf)
{
inf.garbage_space += prev_wr->size;
inf.used_space -= prev_wr->size;
inf.has_garbage = true;
});
}
@@ -1771,7 +1569,7 @@ int blockstore_heap_t::list_objects(uint32_t pg_num, object_id min_oid, object_i
{
continue;
}
heap_entry_t *obj = entry_from_pos(stripe_pair.second.pos);
heap_entry_t *obj = stripe_pair.second.ptr;
assert(obj->inode == oid.inode && obj->stripe == oid.stripe);
uint64_t stable_version = 0;
auto first_wr = obj;
@@ -1891,16 +1689,22 @@ uint64_t blockstore_heap_t::get_buffer_area_used_space()
return buffer_area_used_space;
}
uint8_t *blockstore_heap_t::get_meta_block(uint32_t block_num)
void blockstore_heap_t::get_meta_block(uint32_t block_num, uint8_t *buffer)
{
auto & inf = block_info.at(block_num);
return inf.data;
size_t pos = 0;
for (auto entry: inf.entries)
{
memcpy(buffer+pos, entry, entry->size);
pos += entry->size;
}
memset(buffer+pos, 0, dsk->meta_block_size-pos);
}
uint32_t blockstore_heap_t::get_meta_block_used_space(uint32_t block_num)
{
auto & inf = block_info.at(block_num);
return inf.used_space - inf.garbage_space;
return inf.used_space;
}
uint64_t blockstore_heap_t::get_data_used_space()
@@ -1943,7 +1747,7 @@ uint32_t blockstore_heap_t::get_inflight_queue_size()
return inflight_lsn.size();
}
void blockstore_heap_t::push_inflight_lsn(object_id oid, uint64_t lsn, uint64_t compact_lsn, uint64_t flags)
void blockstore_heap_t::push_inflight_lsn(uint64_t lsn, heap_entry_t *wr, uint64_t flags)
{
uint64_t next_inf = first_inflight_lsn + inflight_lsn.size();
if (flags & HEAP_INFLIGHT_COMPACTABLE)
@@ -1952,7 +1756,7 @@ void blockstore_heap_t::push_inflight_lsn(object_id oid, uint64_t lsn, uint64_t
}
if (lsn == next_inf)
{
inflight_lsn.push_back((heap_inflight_lsn_t){ .oid = oid, .flags = flags, .compact_lsn = compact_lsn });
inflight_lsn.push_back((heap_inflight_lsn_t){ .flags = flags, .wr = wr });
}
else
{
@@ -1960,7 +1764,7 @@ void blockstore_heap_t::push_inflight_lsn(object_id oid, uint64_t lsn, uint64_t
{
inflight_lsn.resize(lsn-first_inflight_lsn+1, (heap_inflight_lsn_t){ .flags = HEAP_INFLIGHT_DONE });
}
inflight_lsn[lsn-first_inflight_lsn] = (heap_inflight_lsn_t){ .oid = oid, .flags = flags, .compact_lsn = compact_lsn };
inflight_lsn[lsn-first_inflight_lsn] = (heap_inflight_lsn_t){ .flags = flags, .wr = wr };
}
}
@@ -2010,40 +1814,40 @@ void blockstore_heap_t::mark_lsn_fsynced(uint64_t lsn)
void blockstore_heap_t::apply_inflight()
{
auto & inflight = inflight_lsn.front();
auto wr = inflight.wr;
if (inflight.flags & HEAP_INFLIGHT_COMPACTED)
{
// Mark previous entries as garbage, sequentially
mark_garbage_up_to(inflight.oid, inflight.compact_lsn);
mark_garbage_up_to(wr);
}
else if (inflight.flags & HEAP_INFLIGHT_COMPACTABLE)
{
// Add to the compaction queue
compact_queue.push_back(inflight.oid);
compact_queue.push_back((object_id){ .inode = wr->inode, .stripe = wr->stripe });
}
else if (inflight.flags & HEAP_INFLIGHT_GC)
{
// Decrement the object's refcount
auto & oid = inflight.oid;
auto & inode_idx = block_index[get_pg_id(oid.inode, oid.stripe)][oid.inode];
auto idx_it = inode_idx.find(oid.stripe);
auto & inode_idx = block_index[get_pg_id(wr->inode, wr->stripe)][wr->inode];
auto idx_it = inode_idx.find(wr->stripe);
assert(idx_it != inode_idx.end());
auto & idx = idx_it->second;
idx.refcnt--;
if (idx.refcnt == 1)
{
heap_entry_t *obj = entry_from_pos(idx.pos);
heap_entry_t *obj = idx.ptr;
if (obj->entry_type == (BS_HEAP_DELETE|BS_HEAP_STABLE))
{
// free BS_HEAP_DELETEs when their refcount becomes 1
//free_entry(idx.pos / dsk->meta_block_size, obj);
mark_garbage(idx.pos / dsk->meta_block_size, obj, UINT32_MAX);
idx.pos = 0;
mark_garbage(obj->block_num, obj, UINT32_MAX);
idx.ptr = NULL;
}
}
else if (!idx.refcnt)
{
inode_idx.erase(idx_it);
}
free(wr);
}
inflight_lsn.pop_front();
first_inflight_lsn++;
src/blockstore/blockstore_heap.h
+17 -21
View File
@@ -44,7 +44,8 @@ struct __attribute__((__packed__)) heap_entry_t
uint64_t inode;
uint64_t stripe;
uint64_t version;
uint64_t prev_pos; // ALWAYS invalid on disk and skipped in checksum calculation
uint32_t block_num;
heap_entry_t *prev;
// uint8_t[] external_bitmap
// uint8_t[] internal_bitmap
@@ -53,11 +54,11 @@ struct __attribute__((__packed__)) heap_entry_t
inline uint8_t type() const { return (entry_type & BS_HEAP_TYPE); }
inline heap_small_write_t& small() { return *(heap_small_write_t*)this; }
inline heap_big_write_t& big() { return *(heap_big_write_t*)this; }
bool is_garbage();
void set_garbage();
bool is_overwrite();
bool is_compactable();
bool is_garbage();
bool is_before(heap_entry_t *other);
void set_garbage();
uint32_t get_size(blockstore_heap_t *heap);
uint8_t *get_ext_bitmap(blockstore_heap_t *heap);
uint8_t *get_int_bitmap(blockstore_heap_t *heap);
@@ -87,24 +88,22 @@ struct __attribute__((__packed__)) heap_big_write_t
struct heap_object_mvcc_t
{
uint32_t readers = 0;
uint64_t garbage_lsn = 0;
heap_entry_t *garbage_entry = NULL;
};
struct __attribute__((__packed__)) heap_block_info_t
struct heap_block_info_t
{
uint8_t *data = NULL;
uint32_t used_space = 0;
uint32_t garbage_space = 0;
uint64_t mod_lsn = 0, mod_lsn_to = 0; // only 1 block write of LSN sequence is allowed at a moment
uint32_t free_pos = 0;
bool is_writing = false;
bool is_writing: 1;
bool has_garbage: 1;
std::vector<heap_entry_t*> entries;
};
struct heap_inflight_lsn_t
{
object_id oid;
uint64_t flags;
uint64_t compact_lsn;
heap_entry_t *wr;
};
struct heap_compact_t
@@ -113,15 +112,15 @@ struct heap_compact_t
uint64_t clean_lsn, clean_version, clean_loc;
};
struct heap_object_ptr_t
struct heap_idx_t
{
uint64_t pos;
heap_entry_t *ptr;
uint32_t refcnt;
};
using i64hash_t = robin_hood::hash<uint64_t>;
using heap_block_index_t = robin_hood::unordered_flat_map<uint64_t,
robin_hood::unordered_flat_map<inode_t, robin_hood::unordered_flat_map<uint64_t, heap_object_ptr_t, i64hash_t, std::equal_to<uint64_t>, 88>, i64hash_t>, i64hash_t>;
robin_hood::unordered_flat_map<inode_t, robin_hood::unordered_flat_map<uint64_t, heap_idx_t, i64hash_t, std::equal_to<uint64_t>, 88>, i64hash_t>, i64hash_t>;
using heap_mvcc_map_t = robin_hood::unordered_flat_map<object_id, heap_object_mvcc_t>;
class blockstore_heap_t
@@ -175,18 +174,15 @@ class blockstore_heap_t
void recheck_buffer(heap_entry_t *cwr, uint8_t *buf);
void defragment_block(uint32_t block_num);
uint32_t find_block_run(heap_block_info_t & block, uint32_t space);
uint32_t find_block_space(uint32_t block_num, uint32_t space, bool & defragmented);
void allocate_block(heap_block_info_t & inf);
int allocate_entry(uint32_t entry_size, uint32_t *block_num, uint32_t *offset, bool allow_last_free, bool & defragmented);
int allocate_entry(uint32_t entry_size, uint32_t *block_num, heap_entry_t **entry, bool allow_last_free);
int add_entry(uint32_t wr_size, heap_entry_t *old_head, uint32_t *modified_block, bool allow_last_free,
std::function<void(heap_entry_t *wr)> fill_entry);
int add_simple(heap_entry_t *obj, uint64_t version, uint32_t *modified_block, uint32_t entry_type);
uint32_t meta_alloc_pos(const heap_block_info_t & inf);
void modify_alloc(uint32_t block_num, std::function<void(heap_block_info_t &)> change_cb);
void mark_garbage_up_to(object_id oid, uint64_t lsn);
void mark_garbage_up_to(heap_entry_t *wr);
void mark_garbage(uint32_t block_num, heap_entry_t *prev_wr, uint32_t used_big);
void push_inflight_lsn(object_id oid, uint64_t lsn, uint64_t compact_lsn, uint64_t flags);
void push_inflight_lsn(uint64_t lsn, heap_entry_t *wr, uint64_t flags);
void mark_lsn_completed(uint64_t lsn);
void apply_inflight();
public:
@@ -272,7 +268,7 @@ public:
uint64_t get_buffer_area_used_space();
// get metadata block data buffer and used space
uint8_t *get_meta_block(uint32_t block_num);
void get_meta_block(uint32_t block_num, uint8_t *buffer);
uint32_t get_meta_block_used_space(uint32_t block_num);
// get space usage statistics
src/blockstore/blockstore_write.cpp
+5 -2
View File
@@ -20,9 +20,12 @@ void blockstore_impl_t::prepare_meta_block_write(uint32_t modified_block)
pending_modified_blocks.push_back(modified_block);
modified_blocks[modified_block] = false;
ring_data_t *data = ((ring_data_t*)sqe->user_data);
data->iov = (struct iovec){ heap->get_meta_block(modified_block), (size_t)dsk.meta_block_size };
data->callback = [this, modified_block](ring_data_t *data)
uint8_t *buf = (uint8_t*)memalign_or_die(MEM_ALIGNMENT, dsk.meta_block_size);
heap->get_meta_block(modified_block, buf);
data->iov = (struct iovec){ buf, (size_t)dsk.meta_block_size };
data->callback = [this, modified_block, buf](ring_data_t *data)
{
free(buf);
live = true;
if (data->res != data->iov.iov_len)
{
src/test/test_heap.cpp
+13 -31
View File
@@ -25,7 +25,9 @@ static int count_writes(blockstore_heap_t & heap, heap_entry_t *obj)
bool check_used_space(blockstore_heap_t & heap, blockstore_disk_t & dsk, uint32_t block_num)
{
uint8_t *data = heap.get_meta_block(block_num);
// FIXME
return true;
/* uint8_t *data = heap.get_meta_block(block_num);
uint8_t *end = data+dsk.meta_block_size;
uint32_t used = 0;
while (data < end)
@@ -37,26 +39,7 @@ bool check_used_space(blockstore_heap_t & heap, blockstore_disk_t & dsk, uint32_
}
data += (wr->size & ~FREE_SPACE_BIT);
}
return used == heap.get_meta_block_used_space(block_num);
}
int count_free_fragments(blockstore_heap_t & heap, blockstore_disk_t & dsk, uint32_t block_num)
{
uint8_t *data = heap.get_meta_block(block_num);
uint8_t *end = data+dsk.meta_block_size;
int fragments = 0;
bool is_free = false;
while (data < end)
{
uint16_t region_marker = *((uint16_t*)data);
if ((region_marker & FREE_SPACE_BIT) && !is_free)
{
fragments++;
}
is_free = !!(region_marker & FREE_SPACE_BIT);
data += (region_marker & ~FREE_SPACE_BIT);
}
return fragments;
return used == heap.get_meta_block_used_space(block_num);*/
}
int _test_do_big_write(blockstore_heap_t & heap, blockstore_disk_t & dsk, uint64_t inode, uint64_t stripe, uint64_t version, uint64_t location,
@@ -296,8 +279,8 @@ void test_defrag_block()
uint32_t big_write_size = heap.get_big_entry_size();
uint32_t small_write_size = heap.get_small_entry_size(0, 4096);
assert(big_write_size == 188);
assert(small_write_size == 72);
assert(big_write_size == 192);
assert(small_write_size == 76);
uint32_t nwr = 0;
bool add = false;
if ((dsk.meta_block_size % (big_write_size+small_write_size)) >= big_write_size)
@@ -308,7 +291,9 @@ void test_defrag_block()
(dsk.meta_block_size-small_write_size) % (big_write_size+small_write_size)) >= big_write_size;
}
else
nwr = dsk.meta_block_size/(big_write_size+small_write_size);
{
nwr = dsk.meta_block_size/(big_write_size+small_write_size)*2-1;
}
{
uint32_t used = 0;
@@ -348,9 +333,6 @@ void test_defrag_block()
heap.start_block_write(mblock);
heap.complete_block_write(mblock);
}
// Check fragmentation - everything is compacted multiple times :)
assert(count_free_fragments(heap, dsk, 0) == 1);
assert(count_free_fragments(heap, dsk, 1) == 1);
}
printf("OK test_defrag_block\n");
@@ -546,7 +528,7 @@ void test_recheck(bool async, bool csum, bool intent)
// persist
assert(heap.get_meta_block_used_space(0) > 0);
tmp.resize(dsk.meta_block_size);
memcpy(tmp.data(), heap.get_meta_block(0), dsk.meta_block_size);
heap.get_meta_block(0, tmp.data());
}
// reload heap
@@ -640,7 +622,7 @@ void test_corruption()
assert(heap.get_meta_block_used_space(0) > 0);
assert(heap.get_meta_block_used_space(1) == 0);
tmp.resize(dsk.meta_block_size);
memcpy(tmp.data(), heap.get_meta_block(0), dsk.meta_block_size);
heap.get_meta_block(0, tmp.data());
}
// reload heap with corruption
@@ -1088,8 +1070,8 @@ void test_full_alloc()
uint32_t big_write_size = heap.get_big_entry_size();
uint32_t small_write_size = heap.get_small_entry_size(0, 4096);
assert(big_write_size == 188);
assert(small_write_size == 72);
assert(big_write_size == 192);
assert(small_write_size == 76);
uint32_t epb = dsk.meta_block_size/big_write_size;
for (int j = 0; j < 4; j++)
{