void
initStorage( void )
{
- nat g;
+ nat g, n;
if (generations != NULL) {
// multi-init protection
* doing something reasonable.
*/
/* We use the NOT_NULL variant or gcc warns that the test is always true */
- ASSERT(LOOKS_LIKE_INFO_PTR_NOT_NULL((StgWord)&stg_BLACKHOLE_info));
+ ASSERT(LOOKS_LIKE_INFO_PTR_NOT_NULL((StgWord)&stg_BLOCKING_QUEUE_CLEAN_info));
ASSERT(LOOKS_LIKE_CLOSURE_PTR(&stg_dummy_ret_closure));
ASSERT(!HEAP_ALLOCED(&stg_dummy_ret_closure));
allocNurseries();
weak_ptr_list = NULL;
- caf_list = NULL;
- revertible_caf_list = NULL;
+ caf_list = END_OF_STATIC_LIST;
+ revertible_caf_list = END_OF_STATIC_LIST;
/* initialise the allocate() interface */
alloc_blocks_lim = RtsFlags.GcFlags.minAllocAreaSize;
N = 0;
+ // allocate a block for each mut list
+ for (n = 0; n < n_capabilities; n++) {
+ for (g = 1; g < RtsFlags.GcFlags.generations; g++) {
+ capabilities[n].mut_lists[g] = allocBlock();
+ }
+ }
+
initGcThreads();
IF_DEBUG(gc, statDescribeGens());
The entry code for every CAF does the following:
- - builds a CAF_BLACKHOLE in the heap
- - pushes an update frame pointing to the CAF_BLACKHOLE
- - invokes UPD_CAF(), which:
- - calls newCaf, below
- - updates the CAF with a static indirection to the CAF_BLACKHOLE
+ - builds a BLACKHOLE in the heap
+ - pushes an update frame pointing to the BLACKHOLE
+ - calls newCaf, below
+ - updates the CAF with a static indirection to the BLACKHOLE
- Why do we build a BLACKHOLE in the heap rather than just updating
+ Why do we build an BLACKHOLE in the heap rather than just updating
the thunk directly? It's so that we only need one kind of update
frame - otherwise we'd need a static version of the update frame too.
newCaf() does the following:
- - it puts the CAF on the oldest generation's mut-once list.
- This is so that we can treat the CAF as a root when collecting
+ - it puts the CAF on the oldest generation's mutable list.
+ This is so that we treat the CAF as a root when collecting
younger generations.
For GHCI, we have additional requirements when dealing with CAFs:
-------------------------------------------------------------------------- */
void
-newCAF(StgClosure* caf)
+newCAF(StgRegTable *reg, StgClosure* caf)
{
- ACQUIRE_SM_LOCK;
-
-#ifdef DYNAMIC
if(keepCAFs)
{
// HACK:
// do another hack here and do an address range test on caf to figure
// out whether it is from a dynamic library.
((StgIndStatic *)caf)->saved_info = (StgInfoTable *)caf->header.info;
+
+ ACQUIRE_SM_LOCK; // caf_list is global, locked by sm_mutex
((StgIndStatic *)caf)->static_link = caf_list;
caf_list = caf;
+ RELEASE_SM_LOCK;
}
else
-#endif
{
- /* Put this CAF on the mutable list for the old generation.
- * This is a HACK - the IND_STATIC closure doesn't really have
- * a mut_link field, but we pretend it has - in fact we re-use
- * the STATIC_LINK field for the time being, because when we
- * come to do a major GC we won't need the mut_link field
- * any more and can use it as a STATIC_LINK.
- */
+ // Put this CAF on the mutable list for the old generation.
((StgIndStatic *)caf)->saved_info = NULL;
- recordMutableGen(caf, oldest_gen->no);
+ if (oldest_gen->no != 0) {
+ recordMutableCap(caf, regTableToCapability(reg), oldest_gen->no);
+ }
}
-
- RELEASE_SM_LOCK;
+}
+
+// External API for setting the keepCAFs flag. see #3900.
+void
+setKeepCAFs (void)
+{
+ keepCAFs = 1;
}
// An alternate version of newCaf which is used for dynamically loaded
// The linker hackily arranges that references to newCaf from dynamic
// code end up pointing to newDynCAF.
void
-newDynCAF(StgClosure *caf)
+newDynCAF (StgRegTable *reg STG_UNUSED, StgClosure *caf)
{
ACQUIRE_SM_LOCK;
allocNursery (bdescr *tail, nat blocks)
{
bdescr *bd;
- nat i;
+ nat i, n;
- // Allocate a nursery: we allocate fresh blocks one at a time and
- // cons them on to the front of the list, not forgetting to update
- // the back pointer on the tail of the list to point to the new block.
- for (i=0; i < blocks; i++) {
- // @LDV profiling
- /*
- processNursery() in LdvProfile.c assumes that every block group in
- the nursery contains only a single block. So, if a block group is
- given multiple blocks, change processNursery() accordingly.
- */
- bd = allocBlock();
- bd->link = tail;
- // double-link the nursery: we might need to insert blocks
- if (tail != NULL) {
- tail->u.back = bd;
- }
- initBdescr(bd, g0, g0);
- bd->flags = 0;
- bd->free = bd->start;
- tail = bd;
+ // We allocate the nursery as a single contiguous block and then
+ // divide it into single blocks manually. This way we guarantee
+ // that the nursery blocks are adjacent, so that the processor's
+ // automatic prefetching works across nursery blocks. This is a
+ // tiny optimisation (~0.5%), but it's free.
+
+ while (blocks > 0) {
+ n = stg_min(blocks, BLOCKS_PER_MBLOCK);
+ blocks -= n;
+
+ bd = allocGroup(n);
+ for (i = 0; i < n; i++) {
+ initBdescr(&bd[i], g0, g0);
+
+ bd[i].blocks = 1;
+ bd[i].flags = 0;
+
+ if (i > 0) {
+ bd[i].u.back = &bd[i-1];
+ }
+
+ if (i+1 < n) {
+ bd[i].link = &bd[i+1];
+ } else {
+ bd[i].link = tail;
+ if (tail != NULL) {
+ tail->u.back = &bd[i];
+ }
+ }
+
+ bd[i].free = bd[i].start;
+ }
+
+ tail = &bd[0];
}
- tail->u.back = NULL;
- return tail;
+
+ return &bd[0];
}
static void
}
p = bd->free;
bd->free += n;
+
+ IF_DEBUG(sanity, ASSERT(*((StgWord8*)p) == 0xaa));
return p;
}
dirty_MUT_VAR(StgRegTable *reg, StgClosure *p)
{
Capability *cap = regTableToCapability(reg);
- bdescr *bd;
if (p->header.info == &stg_MUT_VAR_CLEAN_info) {
p->header.info = &stg_MUT_VAR_DIRTY_info;
- bd = Bdescr((StgPtr)p);
- if (bd->gen_no > 0) recordMutableCap(p,cap,bd->gen_no);
+ recordClosureMutated(cap,p);
}
}
void
setTSOLink (Capability *cap, StgTSO *tso, StgTSO *target)
{
- bdescr *bd;
if (tso->dirty == 0 && (tso->flags & TSO_LINK_DIRTY) == 0) {
tso->flags |= TSO_LINK_DIRTY;
- bd = Bdescr((StgPtr)tso);
- if (bd->gen_no > 0) recordMutableCap((StgClosure*)tso,cap,bd->gen_no);
+ recordClosureMutated(cap,(StgClosure*)tso);
}
tso->_link = target;
}
void
+setTSOPrev (Capability *cap, StgTSO *tso, StgTSO *target)
+{
+ if (tso->dirty == 0 && (tso->flags & TSO_LINK_DIRTY) == 0) {
+ tso->flags |= TSO_LINK_DIRTY;
+ recordClosureMutated(cap,(StgClosure*)tso);
+ }
+ tso->block_info.prev = target;
+}
+
+void
dirty_TSO (Capability *cap, StgTSO *tso)
{
- bdescr *bd;
if (tso->dirty == 0 && (tso->flags & TSO_LINK_DIRTY) == 0) {
- bd = Bdescr((StgPtr)tso);
- if (bd->gen_no > 0) recordMutableCap((StgClosure*)tso,cap,bd->gen_no);
+ recordClosureMutated(cap,(StgClosure*)tso);
}
tso->dirty = 1;
}
void
dirty_MVAR(StgRegTable *reg, StgClosure *p)
{
- Capability *cap = regTableToCapability(reg);
- bdescr *bd;
- bd = Bdescr((StgPtr)p);
- if (bd->gen_no > 0) recordMutableCap(p,cap,bd->gen_no);
+ recordClosureMutated(regTableToCapability(reg),p);
}
/* -----------------------------------------------------------------------------