#include <stddef.h>
#include "OSThreads.h"
+#include "SMP.h"
/* -----------------------------------------------------------------------------
* Generational GC
* ------------------------------------------------------------------------- */
typedef struct step_ {
- unsigned int no; /* step number */
- bdescr * blocks; /* blocks in this step */
- unsigned int n_blocks; /* number of blocks */
- struct step_ * to; /* destination step for live objects */
- struct generation_ * gen; /* generation this step belongs to */
- unsigned int gen_no; /* generation number (cached) */
- bdescr * large_objects; /* large objects (doubly linked) */
- unsigned int n_large_blocks; /* no. of blocks used by large objs */
- int is_compacted; /* compact this step? (old gen only) */
-
- /* During GC, if we are collecting this step, blocks and n_blocks
- * are copied into the following two fields. After GC, these blocks
- * are freed. */
- bdescr * old_blocks; /* bdescr of first from-space block */
- unsigned int n_old_blocks; /* number of blocks in from-space */
-
- /* temporary use during GC: */
- StgPtr hp; /* next free locn in to-space */
- StgPtr hpLim; /* end of current to-space block */
- bdescr * hp_bd; /* bdescr of current to-space block */
- StgPtr scavd_hp; /* ... same as above, but already */
- StgPtr scavd_hpLim; /* scavenged. */
- bdescr * scan_bd; /* block currently being scanned */
- StgPtr scan; /* scan pointer in current block */
- bdescr * new_large_objects; /* large objects collected so far */
- bdescr * scavenged_large_objects; /* live large objs after GC (d-link) */
- unsigned int n_scavenged_large_blocks;/* size of above */
- bdescr * bitmap; /* bitmap for compacting collection */
+ unsigned int no; // step number in this generation
+ unsigned int abs_no; // absolute step number
+ int is_compacted; // compact this step? (old gen only)
+
+ struct generation_ * gen; // generation this step belongs to
+ unsigned int gen_no; // generation number (cached)
+
+ bdescr * blocks; // blocks in this step
+ unsigned int n_blocks; // number of blocks
+
+ struct step_ * to; // destination step for live objects
+
+ bdescr * large_objects; // large objects (doubly linked)
+ unsigned int n_large_blocks; // no. of blocks used by large objs
+
+
+ // ------------------------------------
+ // Fields below are used during GC only
+
+ // During GC, if we are collecting this step, blocks and n_blocks
+ // are copied into the following two fields. After GC, these blocks
+ // are freed.
+
+#if defined(THREADED_RTS)
+ char pad[128]; // make sure the following is
+ // on a separate cache line.
+ SpinLock sync_todo; // lock for todos
+ SpinLock sync_large_objects; // lock for large_objects
+ // and scavenged_large_objects
+#endif
+
+ bdescr * old_blocks; // bdescr of first from-space block
+ unsigned int n_old_blocks; // number of blocks in from-space
+
+ bdescr * todos; // blocks waiting to be scavenged
+ unsigned int n_todos; // count of above
+
+ bdescr * scavenged_large_objects; // live large objs after GC (d-link)
+ unsigned int n_scavenged_large_blocks; // size (not count) of above
+
+ bdescr * bitmap; // bitmap for compacting collection
+
+
} step;
+
typedef struct generation_ {
- unsigned int no; /* generation number */
- step * steps; /* steps */
- unsigned int n_steps; /* number of steps */
- unsigned int max_blocks; /* max blocks in step 0 */
- bdescr *mut_list; /* mut objects in this gen (not G0)*/
-
- /* temporary use during GC: */
- bdescr *saved_mut_list;
-
- /* stats information */
- unsigned int collections;
- unsigned int failed_promotions;
+ unsigned int no; // generation number
+ step * steps; // steps
+ unsigned int n_steps; // number of steps
+ unsigned int max_blocks; // max blocks in step 0
+ bdescr *mut_list; // mut objects in this gen (not G0)
+
+ // stats information
+ unsigned int collections;
+ unsigned int failed_promotions;
+
+ // temporary use during GC:
+ bdescr *saved_mut_list;
} generation;
extern generation * RTS_VAR(generations);
extern generation * RTS_VAR(g0);
extern step * RTS_VAR(g0s0);
extern generation * RTS_VAR(oldest_gen);
+extern step * RTS_VAR(all_steps);
+extern nat total_steps;
/* -----------------------------------------------------------------------------
Initialisation / De-initialisation
extern bdescr * RTS_VAR(large_alloc_list);
extern bdescr * RTS_VAR(pinned_object_block);
-extern StgPtr RTS_VAR(alloc_Hp);
-extern StgPtr RTS_VAR(alloc_HpLim);
-
extern nat RTS_VAR(alloc_blocks);
extern nat RTS_VAR(alloc_blocks_lim);
extern void *allocateExec (nat bytes);
extern void freeExec (void *p);
+/* for splitting blocks groups in two */
+extern bdescr * splitLargeBlock (bdescr *bd, nat blocks);
+
/* -----------------------------------------------------------------------------
Performing Garbage Collection
'get_roots' is called to find all the
roots that the system knows about.
- StgClosure Called by get_roots on each root.
- MarkRoot(StgClosure *p) Returns the new location of the root.
+
-------------------------------------------------------------------------- */
extern void GarbageCollect(rtsBool force_major_gc);
#if defined(THREADED_RTS)
extern Mutex sm_mutex;
extern Mutex atomic_modify_mutvar_mutex;
+extern SpinLock recordMutableGen_sync;
#endif
#if defined(THREADED_RTS)
RELEASE_SM_LOCK;
}
+extern bdescr *allocBlock_sync(void);
+
+// Version of recordMutableGen() for use in parallel GC. The same as
+// recordMutableGen(), except that we surround it with a spinlock and
+// call the spinlock version of allocBlock().
+INLINE_HEADER void
+recordMutableGen_GC(StgClosure *p, generation *gen)
+{
+ bdescr *bd;
+
+ ACQUIRE_SPIN_LOCK(&recordMutableGen_sync);
+
+ bd = gen->mut_list;
+ if (bd->free >= bd->start + BLOCK_SIZE_W) {
+ bdescr *new_bd;
+ new_bd = allocBlock_sync();
+ new_bd->link = bd;
+ bd = new_bd;
+ gen->mut_list = bd;
+ }
+ *bd->free++ = (StgWord)p;
+
+ RELEASE_SPIN_LOCK(&recordMutableGen_sync);
+}
+
INLINE_HEADER void
recordMutable(StgClosure *p)
{
-------------------------------------------------------------------------- */
#define LOOKS_LIKE_INFO_PTR(p) \
- (p && ((StgInfoTable *)(INFO_PTR_TO_STRUCT(p)))->type != INVALID_OBJECT && \
+ (p && LOOKS_LIKE_INFO_PTR_NOT_NULL(p))
+
+#define LOOKS_LIKE_INFO_PTR_NOT_NULL(p) \
+ (((StgInfoTable *)(INFO_PTR_TO_STRUCT(p)))->type != INVALID_OBJECT && \
((StgInfoTable *)(INFO_PTR_TO_STRUCT(p)))->type < N_CLOSURE_TYPES)
#define LOOKS_LIKE_CLOSURE_PTR(p) \
extern void threadPaused ( Capability *cap, StgTSO * );
extern StgClosure * isAlive ( StgClosure *p );
extern void markCAFs ( evac_fn evac );
+extern void GetRoots ( evac_fn evac );
/* -----------------------------------------------------------------------------
Stats 'n' DEBUG stuff
extern ullong RTS_VAR(total_allocated);
extern lnat calcAllocated ( void );
-extern lnat calcLive ( void );
+extern lnat calcLiveBlocks ( void );
+extern lnat calcLiveWords ( void );
+extern lnat countOccupied ( bdescr *bd );
extern lnat calcNeeded ( void );
#if defined(DEBUG)
-extern void memInventory(void);
+extern void memInventory(rtsBool show);
extern void checkSanity(void);
extern nat countBlocks(bdescr *);
extern void checkNurserySanity( step *stp );
extern void move_TSO(StgTSO *src, StgTSO *dest);
extern StgTSO *relocate_stack(StgTSO *dest, ptrdiff_t diff);
-extern StgClosure * RTS_VAR(scavenged_static_objects);
extern StgWeak * RTS_VAR(old_weak_ptr_list);
extern StgWeak * RTS_VAR(weak_ptr_list);
extern StgClosure * RTS_VAR(caf_list);