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gcpriv.h
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#ifndef _DEBUG
#ifdef _MSC_VER
// optimize for speed
#pragma optimize( "t", on )
#endif
#endif
#ifdef __GNUC__
#define inline __attribute__((always_inline)) inline
#else
#define inline __forceinline
#endif // __GNUC__
#include "gc.h"
#include "gcrecord.h"
#ifdef _MSC_VER
#pragma warning(disable:4293)
#pragma warning(disable:4477)
#endif //_MSC_VER
inline void FATAL_GC_ERROR()
{
GCToOSInterface::DebugBreak();
_ASSERTE(!"Fatal Error in GC.");
GCToEEInterface::HandleFatalError((unsigned int)COR_E_EXECUTIONENGINE);
}
#ifdef MULTIPLE_HEAPS
// This turns on instrumentation that collects info for heap balancing.
// Define it and make sure you have HEAP_BALANCE_LOG/HEAP_BALANCE_TEMP_LOG
// level logging enabled *only*.
//#define HEAP_BALANCE_INSTRUMENTATION
#endif //MULTIPLE_HEAPS
#ifdef _MSC_VER
#pragma inline_depth(20)
#endif
/* the following section defines the optional features */
// Regions invariants -
//
// + each generation consists of 1+ regions.
// + a region is in a contiguous address range; different regions could have
// gaps inbetween.
// + a region cannot contain more than one generation.
//
// This means any empty regions can be freely used for any generation. For
// Server GC we will balance regions between heaps.
// For now disable regions for StandAlone GC, NativeAOT and MacOS builds
#if defined (HOST_64BIT) && !defined (BUILD_AS_STANDALONE) && !defined(__APPLE__)
#define USE_REGIONS
#endif //HOST_64BIT && BUILD_AS_STANDALONE
#ifdef USE_REGIONS
// Currently this -
// + creates some pins on our own
// + creates some ro segs
// We can add more mechanisms here.
//#define STRESS_REGIONS
#endif //USE_REGIONS
// FEATURE_STRUCTALIGN was added by Midori. In CLR we are not interested
// in supporting custom alignments on LOH. Currently FEATURE_LOH_COMPACTION
// and FEATURE_STRUCTALIGN are mutually exclusive. It shouldn't be much
// work to make FEATURE_STRUCTALIGN not apply to LOH so they can be both
// turned on.
#define FEATURE_LOH_COMPACTION
#ifdef FEATURE_64BIT_ALIGNMENT
// We need the following feature as part of keeping 64-bit types aligned in the GC heap.
#define RESPECT_LARGE_ALIGNMENT //Preserve double alignment of objects during relocation
#endif //FEATURE_64BIT_ALIGNMENT
#define SHORT_PLUGS //used to keep ephemeral plugs short so they fit better into the oldest generation free items
#ifdef SHORT_PLUGS
#define DESIRED_PLUG_LENGTH (1000)
#endif //SHORT_PLUGS
#define FEATURE_PREMORTEM_FINALIZATION
#define GC_HISTORY
#define BACKGROUND_GC //concurrent background GC (requires WRITE_WATCH)
// We need the lower 3 bits in the MT to do our bookkeeping so doubly linked free list is only for 64-bit
#if defined(BACKGROUND_GC) && defined(HOST_64BIT)
#define DOUBLY_LINKED_FL
#endif //HOST_64BIT
#ifndef FEATURE_NATIVEAOT
#define HEAP_ANALYZE
#define COLLECTIBLE_CLASS
#endif // !FEATURE_NATIVEAOT
#ifdef HEAP_ANALYZE
#define initial_internal_roots (1024*16)
#endif // HEAP_ANALYZE
#ifdef SERVER_GC
#define MH_SC_MARK //scalable marking
//#define SNOOP_STATS //diagnostic
#endif //SERVER_GC
//This is used to mark some type volatile only when the scalable marking is used.
#if defined (SERVER_GC) && defined (MH_SC_MARK)
#define SERVER_SC_MARK_VOLATILE(x) VOLATILE(x)
#else //SERVER_GC&&MH_SC_MARK
#define SERVER_SC_MARK_VOLATILE(x) x
#endif //SERVER_GC&&MH_SC_MARK
//#define MULTIPLE_HEAPS //Allow multiple heaps for servers
#define CARD_BUNDLE //enable card bundle feature.(requires WRITE_WATCH)
#define ALLOW_REFERENCES_IN_POH //Allow POH objects to contain references.
#ifdef BACKGROUND_GC
#define BGC_SERVO_TUNING
#endif //BACKGROUND_GC
#if defined(BACKGROUND_GC) || defined(CARD_BUNDLE) || defined(FEATURE_USE_SOFTWARE_WRITE_WATCH_FOR_GC_HEAP)
#define WRITE_WATCH //Write Watch feature
#endif //BACKGROUND_GC || CARD_BUNDLE
#ifdef WRITE_WATCH
#define array_size 100
#endif //WRITE_WATCH
#define FFIND_DECAY 7 //Number of GC for which fast find will be active
#ifndef MAX_LONGPATH
#define MAX_LONGPATH 1024
#endif // MAX_LONGPATH
//#define TRACE_GC
//#define SIMPLE_DPRINTF
//#define JOIN_STATS //amount of time spent in the join
//#define SYNCHRONIZATION_STATS
//#define SEG_REUSE_STATS
#ifdef SYNCHRONIZATION_STATS
#define BEGIN_TIMING(x) \
int64_t x##_start; \
x##_start = GCToOSInterface::QueryPerformanceCounter()
#define END_TIMING(x) \
int64_t x##_end; \
x##_end = GCToOSInterface::QueryPerformanceCounter(); \
x += x##_end - x##_start
#else //SYNCHRONIZATION_STATS
#define BEGIN_TIMING(x)
#define END_TIMING(x)
#endif //SYNCHRONIZATION_STATS
#ifdef GC_CONFIG_DRIVEN
void GCLogConfig (const char *fmt, ... );
#define cprintf(x) {GCLogConfig x;}
#endif //GC_CONFIG_DRIVEN
// For the bestfit algorithm when we relocate ephemeral generations into an
// existing gen2 segment.
// We recorded sizes from 2^6, 2^7, 2^8...up to 2^30 (1GB). So that's 25 sizes total.
#define MIN_INDEX_POWER2 6
#ifdef SERVER_GC
#ifdef HOST_64BIT
#define MAX_INDEX_POWER2 30
#else
#define MAX_INDEX_POWER2 26
#endif // HOST_64BIT
#else //SERVER_GC
#ifdef HOST_64BIT
#define MAX_INDEX_POWER2 28
#else
#define MAX_INDEX_POWER2 24
#endif // HOST_64BIT
#endif //SERVER_GC
#define MAX_NUM_BUCKETS (MAX_INDEX_POWER2 - MIN_INDEX_POWER2 + 1)
#define MAX_NUM_FREE_SPACES 200
#define MIN_NUM_FREE_SPACES 5
#ifdef memcpy
#undef memcpy
#endif //memcpy
#ifdef FEATURE_STRUCTALIGN
#define REQD_ALIGN_DCL ,int requiredAlignment
#define REQD_ALIGN_ARG ,requiredAlignment
#define REQD_ALIGN_AND_OFFSET_DCL ,int requiredAlignment,size_t alignmentOffset
#define REQD_ALIGN_AND_OFFSET_DEFAULT_DCL ,int requiredAlignment=DATA_ALIGNMENT,size_t alignmentOffset=0
#define REQD_ALIGN_AND_OFFSET_ARG ,requiredAlignment,alignmentOffset
#else // FEATURE_STRUCTALIGN
#define REQD_ALIGN_DCL
#define REQD_ALIGN_ARG
#define REQD_ALIGN_AND_OFFSET_DCL
#define REQD_ALIGN_AND_OFFSET_DEFAULT_DCL
#define REQD_ALIGN_AND_OFFSET_ARG
#endif // FEATURE_STRUCTALIGN
#ifdef MULTIPLE_HEAPS
#define THREAD_NUMBER_DCL ,int thread
#define THREAD_NUMBER_ARG ,thread
#define THREAD_NUMBER_FROM_CONTEXT int thread = sc->thread_number;
#define THREAD_FROM_HEAP int thread = heap_number;
#define HEAP_FROM_THREAD gc_heap* hpt = gc_heap::g_heaps[thread];
#else
#define THREAD_NUMBER_DCL
#define THREAD_NUMBER_ARG
#define THREAD_NUMBER_FROM_CONTEXT
#define THREAD_FROM_HEAP
#define HEAP_FROM_THREAD gc_heap* hpt = 0;
#endif //MULTIPLE_HEAPS
//These constants are ordered
const int policy_sweep = 0;
const int policy_compact = 1;
const int policy_expand = 2;
#ifdef TRACE_GC
#define MIN_CUSTOM_LOG_LEVEL 7
#define SEG_REUSE_LOG_0 (MIN_CUSTOM_LOG_LEVEL)
#define SEG_REUSE_LOG_1 (MIN_CUSTOM_LOG_LEVEL + 1)
#define DT_LOG_0 (MIN_CUSTOM_LOG_LEVEL + 2)
#define BGC_TUNING_LOG (MIN_CUSTOM_LOG_LEVEL + 3)
#define GTC_LOG (MIN_CUSTOM_LOG_LEVEL + 4)
#define GC_TABLE_LOG (MIN_CUSTOM_LOG_LEVEL + 5)
#define JOIN_LOG (MIN_CUSTOM_LOG_LEVEL + 6)
#define SPINLOCK_LOG (MIN_CUSTOM_LOG_LEVEL + 7)
#define SNOOP_LOG (MIN_CUSTOM_LOG_LEVEL + 8)
#define REGIONS_LOG (MIN_CUSTOM_LOG_LEVEL + 9)
// NOTE! This is for HEAP_BALANCE_INSTRUMENTATION
// This particular one is special and needs to be well formatted because we
// do post processing on it with tools\GCLogParser. If you need to add some
// detail to help with investigation that's not 't processed by tooling
// prefix it with TEMP so that line will be written to the results as is in
// the result. I have some already logged with HEAP_BALANCE_TEMP_LOG.
#define HEAP_BALANCE_LOG (MIN_CUSTOM_LOG_LEVEL + 10)
#define HEAP_BALANCE_TEMP_LOG (MIN_CUSTOM_LOG_LEVEL + 11)
#ifdef SIMPLE_DPRINTF
void GCLog (const char *fmt, ... );
#define dprintf(l,x) {if ((l == 1) || (l == GTC_LOG)) {GCLog x;}}
#else //SIMPLE_DPRINTF
#ifdef HOST_64BIT
#define dprintf(l,x) STRESS_LOG_VA(l,x);
#else
#error Logging dprintf to stress log on 32 bits platforms is not supported.
#endif
#endif //SIMPLE_DPRINTF
#else //TRACE_GC
#define dprintf(l,x)
#endif //TRACE_GC
#if !defined(FEATURE_NATIVEAOT) && !defined(BUILD_AS_STANDALONE)
#undef assert
#define assert _ASSERTE
#undef ASSERT
#define ASSERT _ASSERTE
#endif // FEATURE_NATIVEAOT
struct GCDebugSpinLock {
VOLATILE(int32_t) lock; // -1 if free, 0 if held
#ifdef _DEBUG
VOLATILE(Thread *) holding_thread; // -1 if no thread holds the lock.
VOLATILE(BOOL) released_by_gc_p; // a GC thread released the lock.
#endif
#if defined (SYNCHRONIZATION_STATS)
// number of times we went into SwitchToThread in enter_spin_lock.
unsigned int num_switch_thread;
// number of times we went into WaitLonger.
unsigned int num_wait_longer;
// number of times we went to calling SwitchToThread in WaitLonger.
unsigned int num_switch_thread_w;
// number of times we went to calling DisablePreemptiveGC in WaitLonger.
unsigned int num_disable_preemptive_w;
#endif
GCDebugSpinLock()
: lock(-1)
#ifdef _DEBUG
, holding_thread((Thread*) -1)
#endif
#if defined (SYNCHRONIZATION_STATS)
, num_switch_thread(0), num_wait_longer(0), num_switch_thread_w(0), num_disable_preemptive_w(0)
#endif
{
}
#if defined (SYNCHRONIZATION_STATS)
void init()
{
num_switch_thread = 0;
num_wait_longer = 0;
num_switch_thread_w = 0;
num_disable_preemptive_w = 0;
}
#endif
};
typedef GCDebugSpinLock GCSpinLock;
class mark;
class heap_segment;
class CObjectHeader;
class sorted_table;
class seg_free_spaces;
class gc_heap;
#ifdef BACKGROUND_GC
class exclusive_sync;
class recursive_gc_sync;
#endif //BACKGROUND_GC
#ifdef MULTIPLE_HEAPS
// This feature hasn't been enabled for regions yet.
//#ifndef USE_REGIONS
// card marking stealing only makes sense in server GC
// but it works and is easier to debug for workstation GC
// so turn it on for server GC, turn on for workstation GC if necessary
#define FEATURE_CARD_MARKING_STEALING
//#endif //!USE_REGIONS
#endif //MULTIPLE_HEAPS
#ifdef FEATURE_CARD_MARKING_STEALING
class card_marking_enumerator;
#define CARD_MARKING_STEALING_ARG(a) ,a
#define CARD_MARKING_STEALING_ARGS(a,b,c) ,a,b,c
#else // FEATURE_CARD_MARKING_STEALING
#define CARD_MARKING_STEALING_ARG(a)
#define CARD_MARKING_STEALING_ARGS(a,b,c)
#endif // FEATURE_CARD_MARKING_STEALING
// The following 2 modes are of the same format as in clr\src\bcl\system\runtime\gcsettings.cs
// make sure you change that one if you change this one!
enum gc_pause_mode
{
pause_batch = 0, //We are not concerned about pause length
pause_interactive = 1, //We are running an interactive app
pause_low_latency = 2, //short pauses are essential
//avoid long pauses from blocking full GCs unless running out of memory
pause_sustained_low_latency = 3,
pause_no_gc = 4
};
enum gc_loh_compaction_mode
{
loh_compaction_default = 1, // the default mode, don't compact LOH.
loh_compaction_once = 2, // only compact once the next time a blocking full GC happens.
loh_compaction_auto = 4 // GC decides when to compact LOH, to be implemented.
};
enum set_pause_mode_status
{
set_pause_mode_success = 0,
set_pause_mode_no_gc = 1 // NoGCRegion is in progress, can't change pause mode.
};
/*
Latency modes required user to have specific GC knowledge (eg, budget, full blocking GC).
We are trying to move away from them as it makes a lot more sense for users to tell
us what's the most important out of the perf aspects that make sense to them.
In general there are 3 such aspects:
+ memory footprint
+ throughput
+ pause predictibility
Currently the following levels are supported. We may (and will likely) add more
in the future.
+----------+--------------------+---------------------------------------+
| Level | Optimization Goals | Latency Characteristics |
+==========+====================+=======================================+
| 0 | memory footprint | pauses can be long and more frequent |
+----------+--------------------+---------------------------------------+
| 1 | balanced | pauses are more predictable and more |
| | | frequent. the longest pauses are |
| | | shorter than 1. |
+----------+--------------------+---------------------------------------+
*/
enum gc_latency_level
{
latency_level_first = 0,
latency_level_memory_footprint = latency_level_first,
latency_level_balanced = 1,
latency_level_last = latency_level_balanced,
latency_level_default = latency_level_balanced
};
enum gc_tuning_point
{
tuning_deciding_condemned_gen = 0,
tuning_deciding_full_gc = 1,
tuning_deciding_compaction = 2,
tuning_deciding_expansion = 3,
tuning_deciding_promote_ephemeral = 4,
tuning_deciding_short_on_seg = 5
};
enum gc_oh_num
{
soh = 0,
loh = 1,
poh = 2,
unknown = -1,
};
const int total_oh_count = gc_oh_num::poh + 1;
const int recorded_committed_free_bucket = total_oh_count;
const int recorded_committed_bookkeeping_bucket = recorded_committed_free_bucket + 1;
const int recorded_committed_bucket_counts = recorded_committed_bookkeeping_bucket + 1;
gc_oh_num gen_to_oh (int gen);
enum memory_type
{
memory_type_reserved = 0,
memory_type_committed = 1
};
#if defined(TRACE_GC) && defined(BACKGROUND_GC)
static const char * const str_bgc_state[] =
{
"not_in_process",
"mark_handles",
"mark_stack",
"revisit_soh",
"revisit_loh",
"overflow_soh",
"overflow_loh",
"final_marking",
"sweep_soh",
"sweep_loh",
"plan_phase"
};
#endif // defined(TRACE_GC) && defined(BACKGROUND_GC)
enum allocation_state
{
a_state_start = 0,
a_state_can_allocate,
a_state_cant_allocate,
// This could be due to having to wait till a GC is done,
// or having to try a different heap.
a_state_retry_allocate,
a_state_try_fit,
a_state_try_fit_new_seg,
a_state_try_fit_after_cg,
a_state_try_fit_after_bgc,
a_state_try_free_full_seg_in_bgc,
a_state_try_free_after_bgc,
a_state_try_seg_end,
a_state_acquire_seg,
a_state_acquire_seg_after_cg,
a_state_acquire_seg_after_bgc,
a_state_check_and_wait_for_bgc,
a_state_trigger_full_compact_gc,
a_state_trigger_ephemeral_gc,
a_state_trigger_2nd_ephemeral_gc,
a_state_check_retry_seg,
a_state_max
};
enum gc_type
{
gc_type_compacting = 0,
gc_type_blocking = 1,
#ifdef BACKGROUND_GC
gc_type_background = 2,
#endif //BACKGROUND_GC
gc_type_max = 3
};
//encapsulates the mechanism for the current gc
class gc_mechanisms
{
public:
VOLATILE(size_t) gc_index; // starts from 1 for the first GC, like dd_collection_count
int condemned_generation;
BOOL promotion;
BOOL compaction;
BOOL loh_compaction;
BOOL heap_expansion;
uint32_t concurrent;
BOOL demotion;
BOOL card_bundles;
int gen0_reduction_count;
BOOL should_lock_elevation;
int elevation_locked_count;
BOOL elevation_reduced;
BOOL minimal_gc;
gc_reason reason;
gc_pause_mode pause_mode;
BOOL found_finalizers;
#ifdef BACKGROUND_GC
BOOL background_p;
bgc_state b_state;
#endif //BACKGROUND_GC
#ifdef STRESS_HEAP
BOOL stress_induced;
#endif // STRESS_HEAP
// These are opportunistically set
uint32_t entry_memory_load;
uint64_t entry_available_physical_mem;
uint32_t exit_memory_load;
void init_mechanisms(); //for each GC
void first_init(); // for the life of the EE
void record (gc_history_global* history);
};
// This is a compact version of gc_mechanism that we use to save in the history.
class gc_mechanisms_store
{
public:
size_t gc_index;
bool promotion;
bool compaction;
bool loh_compaction;
bool heap_expansion;
bool concurrent;
bool demotion;
bool card_bundles;
bool should_lock_elevation;
int condemned_generation : 8;
int gen0_reduction_count : 8;
int elevation_locked_count : 8;
gc_reason reason : 8;
gc_pause_mode pause_mode : 8;
#ifdef BACKGROUND_GC
bgc_state b_state : 8;
#endif //BACKGROUND_GC
bool found_finalizers;
#ifdef BACKGROUND_GC
bool background_p;
#endif //BACKGROUND_GC
#ifdef STRESS_HEAP
bool stress_induced;
#endif // STRESS_HEAP
#ifdef HOST_64BIT
uint32_t entry_memory_load;
#endif // HOST_64BIT
void store (gc_mechanisms* gm)
{
gc_index = gm->gc_index;
condemned_generation = gm->condemned_generation;
promotion = (gm->promotion != 0);
compaction = (gm->compaction != 0);
loh_compaction = (gm->loh_compaction != 0);
heap_expansion = (gm->heap_expansion != 0);
concurrent = (gm->concurrent != 0);
demotion = (gm->demotion != 0);
card_bundles = (gm->card_bundles != 0);
gen0_reduction_count = gm->gen0_reduction_count;
should_lock_elevation = (gm->should_lock_elevation != 0);
elevation_locked_count = gm->elevation_locked_count;
reason = gm->reason;
pause_mode = gm->pause_mode;
found_finalizers = (gm->found_finalizers != 0);
#ifdef BACKGROUND_GC
background_p = (gm->background_p != 0);
b_state = gm->b_state;
#endif //BACKGROUND_GC
#ifdef STRESS_HEAP
stress_induced = (gm->stress_induced != 0);
#endif // STRESS_HEAP
#ifdef HOST_64BIT
entry_memory_load = gm->entry_memory_load;
#endif // HOST_64BIT
}
};
typedef DPTR(class heap_segment) PTR_heap_segment;
typedef DPTR(class gc_heap) PTR_gc_heap;
typedef DPTR(PTR_gc_heap) PTR_PTR_gc_heap;
#ifdef FEATURE_PREMORTEM_FINALIZATION
typedef DPTR(class CFinalize) PTR_CFinalize;
#endif // FEATURE_PREMORTEM_FINALIZATION
//-------------------------------------
//generation free list. It is an array of free lists bucketed by size, starting at sizes lower than (1 << first_bucket_bits)
//and doubling each time. The last bucket (index == num_buckets) is for largest sizes with no limit
#define MAX_SOH_BUCKET_COUNT (13)//Max number of buckets for the SOH generations.
#define MAX_BUCKET_COUNT (20)//Max number of buckets.
class alloc_list
{
#ifdef DOUBLY_LINKED_FL
uint8_t* added_head;
uint8_t* added_tail;
#endif //DOUBLY_LINKED_FL
uint8_t* head;
uint8_t* tail;
size_t damage_count;
public:
#ifdef FL_VERIFICATION
size_t item_count;
#endif //FL_VERIFICATION
#ifdef DOUBLY_LINKED_FL
uint8_t*& added_alloc_list_head () { return added_head;}
uint8_t*& added_alloc_list_tail () { return added_tail;}
#endif //DOUBLY_LINKED_FL
uint8_t*& alloc_list_head () { return head;}
uint8_t*& alloc_list_tail () { return tail;}
size_t& alloc_list_damage_count(){ return damage_count; }
alloc_list()
{
#ifdef DOUBLY_LINKED_FL
added_head = 0;
added_tail = 0;
#endif //DOUBLY_LINKED_FL
head = 0;
tail = 0;
damage_count = 0;
}
};
#ifdef FEATURE_EVENT_TRACE
struct etw_bucket_info
{
uint16_t index;
uint32_t count;
size_t size;
void set (uint16_t _index, uint32_t _count, size_t _size)
{
index = _index;
count = _count;
size = _size;
}
};
#endif //FEATURE_EVENT_TRACE
class allocator
{
int first_bucket_bits;
unsigned int num_buckets;
alloc_list first_bucket;
alloc_list* buckets;
int gen_number;
alloc_list& alloc_list_of (unsigned int bn);
size_t& alloc_list_damage_count_of (unsigned int bn);
void thread_free_item_end (uint8_t* free_item, uint8_t*& head, uint8_t*& tail, int bn);
public:
allocator (unsigned int num_b, int fbb, alloc_list* b, int gen=-1);
allocator()
{
num_buckets = 1;
first_bucket_bits = sizeof(size_t) * 8 - 1;
// for young gens we just set it to 0 since we don't treat
// them differently from each other
gen_number = 0;
}
unsigned int number_of_buckets()
{
return num_buckets;
}
// skip buckets that cannot possibly fit "size" and return the next one
// there is always such bucket since the last one fits everything
unsigned int first_suitable_bucket (size_t size)
{
// sizes taking first_bucket_bits or less are mapped to bucket 0
// others are mapped to buckets 0, 1, 2 respectively
size = (size >> first_bucket_bits) | 1;
DWORD highest_set_bit_index;
#ifdef HOST_64BIT
BitScanReverse64(&highest_set_bit_index, size);
#else
BitScanReverse(&highest_set_bit_index, size);
#endif
return min ((unsigned int)highest_set_bit_index, (num_buckets - 1));
}
size_t first_bucket_size()
{
return ((size_t)1 << (first_bucket_bits + 1));
}
uint8_t*& alloc_list_head_of (unsigned int bn)
{
return alloc_list_of (bn).alloc_list_head();
}
uint8_t*& alloc_list_tail_of (unsigned int bn)
{
return alloc_list_of (bn).alloc_list_tail();
}
#ifdef DOUBLY_LINKED_FL
uint8_t*& added_alloc_list_head_of (unsigned int bn)
{
return alloc_list_of (bn).added_alloc_list_head();
}
uint8_t*& added_alloc_list_tail_of (unsigned int bn)
{
return alloc_list_of (bn).added_alloc_list_tail();
}
#endif //DOUBLY_LINKED_FL
void clear();
BOOL discard_if_no_fit_p()
{
return (num_buckets == 1);
}
// This is when we know there's nothing to repair because this free
// list has never gone through plan phase. Right now it's only used
// by the background ephemeral sweep when we copy the local free list
// to gen0's free list.
//
// We copy head and tail manually (vs together like copy_to_alloc_list)
// since we need to copy tail first because when we get the free items off
// of each bucket we check head first. We also need to copy the
// smaller buckets first so when gen0 allocation needs to thread
// smaller items back that bucket is guaranteed to have been full
// copied.
void copy_with_no_repair (allocator* allocator_to_copy)
{
assert (num_buckets == allocator_to_copy->number_of_buckets());
for (unsigned int i = 0; i < num_buckets; i++)
{
alloc_list* al = &(allocator_to_copy->alloc_list_of (i));
alloc_list_tail_of(i) = al->alloc_list_tail();
#if !defined(TARGET_AMD64) && !defined(TARGET_X86)
// ensure that the write to the tail is seen by
// the allocating thread *before* the write to the head
MemoryBarrier();
#endif
alloc_list_head_of(i) = al->alloc_list_head();
}
}
void unlink_item (unsigned int bn, uint8_t* item, uint8_t* previous_item, BOOL use_undo_p);
void thread_item (uint8_t* item, size_t size);
void thread_item_front (uint8_t* itme, size_t size);
#ifdef DOUBLY_LINKED_FL
int thread_item_front_added (uint8_t* itme, size_t size);
void unlink_item_no_undo (uint8_t* item, size_t size);
void unlink_item_no_undo (unsigned int bn, uint8_t* item, size_t size);
void unlink_item_no_undo_added (unsigned int bn, uint8_t* item, uint8_t* previous_item);
#endif //DOUBLY_LINKED_FL
void copy_to_alloc_list (alloc_list* toalist);
void copy_from_alloc_list (alloc_list* fromalist);
void commit_alloc_list_changes();
#ifdef USE_REGIONS
void thread_sip_fl (heap_segment* region);
#endif //USE_REGIONS
#ifdef FEATURE_EVENT_TRACE
uint16_t count_largest_items (etw_bucket_info* bucket_info,
size_t max_size,
size_t max_item_count,
size_t* recorded_fl_info_size);
#endif //FEATURE_EVENT_TRACE
};
#define NUM_GEN_POWER2 (20)
#define BASE_GEN_SIZE (1*512)
// group the frequently used ones together (need intrumentation on accessors)
class generation
{
public:
// Don't move these first two fields without adjusting the references
// from the __asm in jitinterface.cpp.
alloc_context allocation_context;
PTR_heap_segment start_segment;
#ifndef USE_REGIONS
uint8_t* allocation_start;
#endif //!USE_REGIONS
heap_segment* allocation_segment;
uint8_t* allocation_context_start_region;
#ifdef USE_REGIONS
heap_segment* tail_region;
heap_segment* plan_start_segment;
// only max_generation could have ro regions; for other generations
// this will be 0.
heap_segment* tail_ro_region;
#endif //USE_REGIONS
allocator free_list_allocator;
size_t free_list_allocated;
size_t end_seg_allocated;
BOOL allocate_end_seg_p;
size_t condemned_allocated;
size_t sweep_allocated;
size_t free_list_space;
size_t free_obj_space;
size_t allocation_size;
#ifndef USE_REGIONS
uint8_t* plan_allocation_start;
size_t plan_allocation_start_size;
#endif //!USE_REGIONS
// this is the pinned plugs that got allocated into this gen.
size_t pinned_allocated;
size_t pinned_allocation_compact_size;
size_t pinned_allocation_sweep_size;
int gen_num;
#ifdef DOUBLY_LINKED_FL
BOOL set_bgc_mark_bit_p;
uint8_t* last_free_list_allocated;
#endif //DOUBLY_LINKED_FL
#ifdef FREE_USAGE_STATS
size_t gen_free_spaces[NUM_GEN_POWER2];
// these are non pinned plugs only
size_t gen_plugs[NUM_GEN_POWER2];
size_t gen_current_pinned_free_spaces[NUM_GEN_POWER2];
size_t pinned_free_obj_space;
// this is what got allocated into the pinned free spaces.
size_t allocated_in_pinned_free;
size_t allocated_since_last_pin;
#endif //FREE_USAGE_STATS
};
// static data remains the same after it's initialized.
// It's per generation.
// TODO: for gen_time_tuning, we should put the multipliers in static data.
struct static_data
{
size_t min_size;
size_t max_size;
size_t fragmentation_limit;
float fragmentation_burden_limit;
float limit;
float max_limit;
uint64_t time_clock; // time after which to collect generation, in performance counts (see QueryPerformanceCounter)
size_t gc_clock; // number of gcs after which to collect generation
};
// The dynamic data fields are grouped into 3 categories:
//
// calculated logical data (like desired_allocation)
// physical data (like fragmentation)
// const data (sdata), initialized at the beginning
class dynamic_data
{
public:
ptrdiff_t new_allocation;
ptrdiff_t gc_new_allocation; // new allocation at beginning of gc
float surv;
size_t desired_allocation;
// # of bytes taken by objects (ie, not free space) at the beginning
// of the GC.
size_t begin_data_size;
// # of bytes taken by survived objects after mark.
size_t survived_size;
// # of bytes taken by survived pinned plugs after mark.
size_t pinned_survived_size;
size_t artificial_pinned_survived_size;
size_t added_pinned_size;
#ifdef SHORT_PLUGS
size_t padding_size;
#endif //SHORT_PLUGS
#if defined (RESPECT_LARGE_ALIGNMENT) || defined (FEATURE_STRUCTALIGN)
// # of plugs that are not pinned plugs.
size_t num_npinned_plugs;
#endif //RESPECT_LARGE_ALIGNMENT || FEATURE_STRUCTALIGN
//total object size after a GC, ie, doesn't include fragmentation
size_t current_size;
size_t collection_count;
size_t promoted_size;
size_t freach_previous_promotion;
size_t fragmentation; //fragmentation when we don't compact
size_t gc_clock; //gc# when last GC happened
uint64_t time_clock; //time when last gc started
uint64_t previous_time_clock; // time when previous gc started
size_t gc_elapsed_time; // Time it took for the gc to complete
float gc_speed; // speed in bytes/msec for the gc to complete
size_t min_size;
static_data* sdata;
};
struct recorded_generation_info
{
size_t size_before;
size_t fragmentation_before;
size_t size_after;
size_t fragmentation_after;
};
struct last_recorded_gc_info
{
VOLATILE(size_t) index;
size_t total_committed;
size_t promoted;
size_t pinned_objects;
size_t finalize_promoted_objects;
size_t pause_durations[2];
float pause_percentage;
recorded_generation_info gen_info[total_generation_count];
size_t heap_size;
size_t fragmentation;
uint32_t memory_load;
uint8_t condemned_generation;
bool compaction;
bool concurrent;
};
// alignment helpers
//Alignment constant for allocation
#define ALIGNCONST (DATA_ALIGNMENT-1)
inline
size_t Align (size_t nbytes, int alignment=ALIGNCONST)
{
return (nbytes + alignment) & ~alignment;
}
//return alignment constant for small object heap vs large object heap
inline
int get_alignment_constant (BOOL small_object_p)
{
#ifdef FEATURE_STRUCTALIGN
// If any objects on the large object heap require 8-byte alignment,
// the compiler will tell us so. Let's not guess an alignment here.
return ALIGNCONST;
#else // FEATURE_STRUCTALIGN
return small_object_p ? ALIGNCONST : 7;
#endif // FEATURE_STRUCTALIGN
}
struct etw_opt_info
{
size_t desired_allocation;
size_t new_allocation;
int gen_number;
};
// Note, I am not removing the ones that are no longer used
// because the older versions of the runtime still use them
// and ETW interprets them.
enum alloc_wait_reason
{
// When we don't care about firing an event for
// this.
awr_ignored = -1,
// when we detect we are in low memory
awr_low_memory = 0,
// when we detect the ephemeral segment is too full
awr_low_ephemeral = 1,
// we've given out too much budget for gen0.
awr_gen0_alloc = 2,
// we've given out too much budget for loh.
awr_loh_alloc = 3,
// this event is really obsolete - it's for pre-XP
// OSs where low mem notification is not supported.
awr_alloc_loh_low_mem = 4,