Keep track of an accurate count of live words in each step

[ghc-hetmet.git] / rts / sm / GC.h

diff --git a/rts/sm/GC.h b/rts/sm/GC.h
index 488a2db..5a9cb98 100644 (file)
--- a/rts/sm/GC.h
+++ b/rts/sm/GC.h
@@ -73,24 +73,30 @@
    ------------------------------------------------------------------------- */
 
 typedef struct step_workspace_ {
-    step * stp;                        // the step for this workspace 
+    step * step;               // the step for this workspace 
     struct gc_thread_ * gct;    // the gc_thread that contains this workspace
 
     // block that is currently being scanned
     bdescr *     scan_bd;
-    StgPtr       scan;               // the scan pointer
 
     // where objects to be scavenged go
     bdescr *     todo_bd;
+    StgPtr       todo_free;            // free ptr for todo_bd
+    StgPtr       todo_lim;             // lim for todo_bd
+
     bdescr *     buffer_todo_bd;     // buffer to reduce contention
                                      // on the step's todos list
 
     // where large objects to be scavenged go
     bdescr *     todo_large_objects;
 
-    // Objects that need not be, or have already been, scavenged.
+    // Objects that have already been, scavenged.
     bdescr *     scavd_list;
-    lnat         n_scavd_blocks;     // count of blocks in this list
+    nat          n_scavd_blocks;     // count of blocks in this list
+
+    // Partially-full, scavenged, blocks
+    bdescr *     part_list;
+    unsigned int n_part_blocks;      // count of above
 
 } step_workspace;
 
@@ -113,12 +119,13 @@ typedef struct gc_thread_ {
 #endif
     nat thread_index;              // a zero based index identifying the thread
 
-    step_workspace ** steps;      // 2-d array (gen,step) of workspaces
-
     bdescr * free_blocks;          // a buffer of free blocks for this thread
                                    //  during GC without accessing the block
                                    //   allocators spin lock. 
 
+    StgClosure* static_objects;      // live static objects
+    StgClosure* scavenged_static_objects;   // static objects scavenged so far
+
     lnat gc_count;                 // number of gc's this thread has done
 
     // --------------------
@@ -132,9 +139,9 @@ typedef struct gc_thread_ {
                                    // optimise it into a per-thread
                                    // variable).
 
-    rtsBool failed_to_evac;        // failue to evacuate an object typically 
-                                   //  causes it to be recorded in the mutable 
-                                   //  object list
+    rtsBool failed_to_evac;        // failure to evacuate an object typically 
+                                   // Causes it to be recorded in the mutable 
+                                   // object list
 
     rtsBool eager_promotion;       // forces promotion to the evac gen
                                    // instead of the to-space
@@ -142,18 +149,37 @@ typedef struct gc_thread_ {
 
     lnat thunk_selector_depth;     // ummm.... not used as of now
 
+#ifdef USE_PAPI
+    int papi_events;
+#endif
+
+    // -------------------
+    // stats
+
+    lnat copied;
+    lnat any_work;
+    lnat no_work;
+    lnat scav_find_work;
+
+    // -------------------
+    // workspaces
+
+    // array of workspaces, indexed by stp->abs_no.  This is placed
+    // directly at the end of the gc_thread structure so that we can get from
+    // the gc_thread pointer to a workspace using only pointer
+    // arithmetic, no memory access.  This happens in the inner loop
+    // of the GC, see Evac.c:alloc_for_copy().
+    step_workspace steps[];
 } gc_thread;
 
 extern nat N;
 extern rtsBool major_gc;
+extern nat n_gc_threads;
 
-extern gc_thread *gc_threads;
+extern gc_thread **gc_threads;
 register gc_thread *gct __asm__("%rbx");
 // extern gc_thread *gct;  // this thread's gct TODO: make thread-local
 
-extern StgClosure* static_objects;
-extern StgClosure* scavenged_static_objects;
-
 extern bdescr *mark_stack_bdescr;
 extern StgPtr *mark_stack;
 extern StgPtr *mark_sp;
@@ -164,11 +190,6 @@ extern bdescr *oldgen_scan_bd;
 extern StgPtr  oldgen_scan;
 
 extern long copied;
-extern long scavd_copied;
-
-#ifdef THREADED_RTS
-extern SpinLock static_objects_sync;
-#endif
 
 #ifdef DEBUG
 extern nat mutlist_MUTVARS, mutlist_MUTARRS, mutlist_MVARS, mutlist_OTHERS;
@@ -176,4 +197,6 @@ extern nat mutlist_MUTVARS, mutlist_MUTARRS, mutlist_MVARS, mutlist_OTHERS;
 
 StgClosure * isAlive(StgClosure *p);
 
+#define WORK_UNIT_WORDS 128
+
 #endif /* GC_H */