#include <algorithm>
#include <vector>
-#include <cds/gc/dhp_smr.h>
+#include <cds/gc/dhp.h>
#include <cds/os/thread.h>
namespace cds { namespace gc { namespace dhp {
}
};
+ stat s_postmortem_stat;
} // namespace
/*static*/ CDS_EXPORT_API smr* smr::instance_ = nullptr;
// allocate new block
gb = new( s_alloc_memory( sizeof( guard_block ) + sizeof( guard ) * defaults::c_extended_guard_block_size )) guard_block;
new ( gb->first() ) guard[defaults::c_extended_guard_block_size];
+
+ CDS_HPSTAT( block_allocated_.fetch_add( 1, atomics::memory_order_relaxed ));
}
// links guards in the block
// allocate new block
rb = new( s_alloc_memory( sizeof( retired_block ) + sizeof( retired_ptr ) * retired_block::c_capacity )) retired_block;
new ( rb->first()) retired_ptr[retired_block::c_capacity];
+ CDS_HPSTAT( block_allocated_.fetch_add( 1, atomics::memory_order_relaxed ) );
}
rb->next_ = nullptr;
thread_record( guard* guards, size_t guard_count )
: thread_data( guards, guard_count )
+ , m_pNextNode( nullptr )
+ , m_idOwner( cds::OS::c_NullThreadId )
, m_bFree( false )
{}
};
}
CDS_EXPORT_API smr::smr( size_t nInitialHazardPtrCount )
- : thread_list_( nullptr )
- , initial_hazard_count_( nInitialHazardPtrCount < 4 ? 16 : nInitialHazardPtrCount )
+ : initial_hazard_count_( nInitialHazardPtrCount < 4 ? 16 : nInitialHazardPtrCount )
, last_plist_size_( initial_hazard_count_ * 64 )
- {}
+ {
+ thread_list_.store( nullptr, atomics::memory_order_release );
+ }
CDS_EXPORT_API smr::~smr()
{
CDS_DEBUG_ONLY( const cds::OS::ThreadId nullThreadId = cds::OS::c_NullThreadId; )
CDS_DEBUG_ONLY( const cds::OS::ThreadId mainThreadId = cds::OS::get_current_thread_id(); )
+ CDS_HPSTAT( statistics( s_postmortem_stat ) );
+
thread_record* pHead = thread_list_.load( atomics::memory_order_relaxed );
- thread_list_.store( nullptr, atomics::memory_order_relaxed );
+ thread_list_.store( nullptr, atomics::memory_order_release );
thread_record* pNext = nullptr;
for ( thread_record* hprec = pHead; hprec; hprec = pNext )
{
assert( hprec->m_idOwner.load( atomics::memory_order_relaxed ) == nullThreadId
- || hprec->m_idOwner.load( atomics::memory_order_relaxed ) == mainThreadId
- || !cds::OS::is_thread_alive( hprec->m_idOwner.load( atomics::memory_order_relaxed ) )
- );
+ || hprec->m_idOwner.load( atomics::memory_order_relaxed ) == mainThreadId );
retired_array& retired = hprec->retired_;
// delete retired data
for ( retired_block* block = retired.list_head_; block && block != retired.current_block_; block = block->next_ ) {
- for ( retired_ptr* p = block->first(); p != block->last(); ++p )
+ for ( retired_ptr* p = block->first(); p != block->last(); ++p ) {
p->free();
+ CDS_HPSTAT( ++s_postmortem_stat.free_count );
+ }
}
if ( retired.current_block_ ) {
- for ( retired_ptr* p = retired.current_block_->first(); p != retired.current_cell_; ++p )
+ for ( retired_ptr* p = retired.current_block_->first(); p != retired.current_cell_; ++p ) {
p->free();
+ CDS_HPSTAT( ++s_postmortem_stat.free_count );
+ }
}
hprec->retired_.fini();
hprec->hazards_.clear();
const cds::OS::ThreadId curThreadId = cds::OS::get_current_thread_id();
// First try to reuse a free (non-active) DHP record
- for ( hprec = thread_list_.load( atomics::memory_order_acquire ); hprec; hprec = hprec->m_pNextNode.load( atomics::memory_order_relaxed ) ) {
+ for ( hprec = thread_list_.load( atomics::memory_order_acquire ); hprec; hprec = hprec->m_pNextNode.load( atomics::memory_order_acquire ) ) {
cds::OS::ThreadId thId = nullThreadId;
if ( !hprec->m_idOwner.compare_exchange_strong( thId, curThreadId, atomics::memory_order_relaxed, atomics::memory_order_relaxed ) )
continue;
hprec = create_thread_data();
hprec->m_idOwner.store( curThreadId, atomics::memory_order_relaxed );
- thread_record* pOldHead = thread_list_.load( atomics::memory_order_relaxed );
+ thread_record* pOldHead = thread_list_.load( atomics::memory_order_acquire );
do {
- hprec->m_pNextNode.store( pOldHead, atomics::memory_order_relaxed );
+ hprec->m_pNextNode.store( pOldHead, atomics::memory_order_release );
} while ( !thread_list_.compare_exchange_weak( pOldHead, hprec, atomics::memory_order_release, atomics::memory_order_acquire ) );
}
for ( retired_ptr* p = block->first(), *end = p + block_size; p != end; ++p ) {
if ( cds_unlikely( std::binary_search( hp_begin, hp_end, p->m_p )))
- stg.safe_push( p );
+ stg.repush( p );
else {
p->free();
++count;
{
thread_record* pRec = static_cast<thread_record*>( pThreadRec );
+ CDS_HPSTAT( ++pRec->scan_call_count_ );
+
hp_vector plist;
size_t plist_size = last_plist_size_.load( std::memory_order_relaxed );
plist.reserve( plist_size );
if ( pNode->m_idOwner.load( std::memory_order_relaxed ) != cds::OS::c_NullThreadId ) {
copy_hazards( plist, pNode->hazards_.array_, pNode->hazards_.initial_capacity_ );
- for ( guard_block* block = pNode->hazards_.extended_list_; block; block = block->next_ )
+ for ( guard_block* block = pNode->hazards_.extended_list_.load( atomics::memory_order_acquire );
+ block;
+ block = block->next_block_.load( atomics::memory_order_acquire ) )
+ {
copy_hazards( plist, block->first(), defaults::c_extended_guard_block_size );
+ }
}
pNode = pNode->m_pNextNode.load( atomics::memory_order_relaxed );
// Stage 2: Search plist
size_t free_count = 0;
+ size_t retired_count = 0;
retired_block* last_block = pRec->retired_.current_block_;
retired_ptr* last_block_cell = pRec->retired_.current_cell_;
bool const end_block = block == last_block;
size_t const size = end_block ? last_block_cell - block->first() : retired_block::c_capacity;
+ retired_count += retired_block::c_capacity;
free_count += retire_data( plist, pRec->retired_, block, size );
if ( end_block )
break;
}
+ CDS_HPSTAT( pRec->free_call_count_ += free_count );
// If the count of freed elements is too small, increase retired array
- if ( free_count == 0 && last_block == pRec->retired_.list_tail_ && last_block_cell == last_block->last() )
+ if ( free_count < retired_count / 4 && last_block == pRec->retired_.list_tail_ && last_block_cell == last_block->last() )
pRec->retired_.extend();
}
CDS_EXPORT_API void smr::help_scan( thread_data* pThis )
{
assert( static_cast<thread_record*>( pThis )->m_idOwner.load( atomics::memory_order_relaxed ) == cds::OS::get_current_thread_id() );
+ CDS_HPSTAT( ++pThis->help_scan_call_count_ );
const cds::OS::ThreadId nullThreadId = cds::OS::c_NullThreadId;
const cds::OS::ThreadId curThreadId = cds::OS::get_current_thread_id();
for ( thread_record* hprec = thread_list_.load( atomics::memory_order_acquire ); hprec; hprec = hprec->m_pNextNode.load( atomics::memory_order_relaxed ) )
{
+ if ( hprec == static_cast<thread_record*>( pThis ))
+ continue;
+
// If m_bFree == true then hprec->retired_ is empty - we don't need to see it
if ( hprec->m_bFree.load( atomics::memory_order_acquire ) ) {
+ CDS_TSAN_ANNOTATE_IGNORE_READS_BEGIN;
assert( hprec->retired_.empty() );
+ CDS_TSAN_ANNOTATE_IGNORE_READS_END;
continue;
}
// Several threads may work concurrently so we use atomic technique
{
cds::OS::ThreadId curOwner = hprec->m_idOwner.load( atomics::memory_order_relaxed );
- if ( curOwner == nullThreadId || !cds::OS::is_thread_alive( curOwner ) ) {
+ if ( curOwner == nullThreadId ) {
if ( !hprec->m_idOwner.compare_exchange_strong( curOwner, curThreadId, atomics::memory_order_acquire, atomics::memory_order_relaxed ) )
continue;
}
}
// We own the thread record successfully. Now, we can see whether it has retired pointers.
- // If it has ones then we move to pThis that is private for current thread.
+ // If it has ones then we move them to pThis that is private for current thread.
retired_array& src = hprec->retired_;
retired_array& dest = pThis->retired_;
scan( pThis );
}
+ CDS_EXPORT_API void smr::statistics( stat& st )
+ {
+ st.clear();
+# ifdef CDS_ENABLE_HPSTAT
+ for ( thread_record* hprec = thread_list_.load( atomics::memory_order_acquire ); hprec; hprec = hprec->m_pNextNode.load( atomics::memory_order_relaxed ) )
+ {
+ CDS_TSAN_ANNOTATE_IGNORE_READS_BEGIN;
+ ++st.thread_rec_count;
+ st.guard_allocated += hprec->hazards_.alloc_guard_count_;
+ st.guard_freed += hprec->hazards_.free_guard_count_;
+ st.hp_extend_count += hprec->hazards_.extend_call_count_;
+ st.retired_count += hprec->retired_.retire_call_count_;
+ st.retired_extend_count += hprec->retired_.extend_call_count_;
+ st.free_count += hprec->free_call_count_;
+ st.scan_count += hprec->scan_call_count_;
+ st.help_scan_count += hprec->help_scan_call_count_;
+ CDS_TSAN_ANNOTATE_IGNORE_READS_END;
+ }
+
+ CDS_TSAN_ANNOTATE_IGNORE_READS_BEGIN;
+ st.hp_block_count = hp_allocator_.block_allocated_.load( atomics::memory_order_relaxed );
+ st.retired_block_count = retired_allocator_.block_allocated_.load( atomics::memory_order_relaxed );
+ CDS_TSAN_ANNOTATE_IGNORE_READS_END;
+# endif
+ }
+
+
}}} // namespace cds::gc::dhp
+
+CDS_EXPORT_API /*static*/ cds::gc::DHP::stat const& cds::gc::DHP::postmortem_statistics()
+{
+ return cds::gc::dhp::s_postmortem_stat;
+}
+
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