diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2024-08-23-11-26-54.gh-issue-122298.ZMyln4.rst b/Misc/NEWS.d/next/Core_and_Builtins/2024-08-23-11-26-54.gh-issue-122298.ZMyln4.rst new file mode 100644 index 00000000000..e7645bfc5f3 --- /dev/null +++ b/Misc/NEWS.d/next/Core_and_Builtins/2024-08-23-11-26-54.gh-issue-122298.ZMyln4.rst @@ -0,0 +1,3 @@ +Restore printout of GC stats when ``gc.set_debug(gc.DEBUG_STATS)`` is +called. This featue was accidentally removed when implementing incremental +GC. diff --git a/Python/gc.c b/Python/gc.c index aa8b216124c..de24e486541 100644 --- a/Python/gc.c +++ b/Python/gc.c @@ -1289,6 +1289,7 @@ gc_collect_young(PyThreadState *tstate, GCState *gcstate = &tstate->interp->gc; PyGC_Head *young = &gcstate->young.head; PyGC_Head *visited = &gcstate->old[gcstate->visited_space].head; + GC_STAT_ADD(0, collections, 1); #ifdef Py_STATS { Py_ssize_t count = 0; @@ -1417,6 +1418,7 @@ completed_cycle(GCState *gcstate) static void gc_collect_increment(PyThreadState *tstate, struct gc_collection_stats *stats) { + GC_STAT_ADD(1, collections, 1); GCState *gcstate = &tstate->interp->gc; PyGC_Head *not_visited = &gcstate->old[gcstate->visited_space^1].head; PyGC_Head *visited = &gcstate->old[gcstate->visited_space].head; @@ -1462,6 +1464,7 @@ static void gc_collect_full(PyThreadState *tstate, struct gc_collection_stats *stats) { + GC_STAT_ADD(2, collections, 1); GCState *gcstate = &tstate->interp->gc; validate_old(gcstate); PyGC_Head *young = &gcstate->young.head; @@ -1784,6 +1787,24 @@ PyGC_IsEnabled(void) return gcstate->enabled; } +// Show stats for objects in each generations +static void +show_stats_each_generations(GCState *gcstate) +{ + char buf[100]; + size_t pos = 0; + + for (int i = 0; i < NUM_GENERATIONS && pos < sizeof(buf); i++) { + pos += PyOS_snprintf(buf+pos, sizeof(buf)-pos, + " %zd", + gc_list_size(GEN_HEAD(gcstate, i))); + } + PySys_FormatStderr( + "gc: objects in each generation:%s\n" + "gc: objects in permanent generation: %zd\n", + buf, gc_list_size(&gcstate->permanent_generation.head)); +} + Py_ssize_t _PyGC_Collect(PyThreadState *tstate, int generation, _PyGC_Reason reason) { @@ -1799,6 +1820,10 @@ _PyGC_Collect(PyThreadState *tstate, int generation, _PyGC_Reason reason) if (reason != _Py_GC_REASON_SHUTDOWN) { invoke_gc_callback(gcstate, "start", generation, &stats); } + if (gcstate->debug & _PyGC_DEBUG_STATS) { + PySys_WriteStderr("gc: collecting generation %d...\n", generation); + show_stats_each_generations(gcstate); + } if (PyDTrace_GC_START_ENABLED()) { PyDTrace_GC_START(generation); }