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gststructure: Inline array and contents
Instead of having 3 allocations: * One for GstStructure * One for GArray * One for the array *within* GArray We try to limit this to a single allocation, inlining everything. This reduces the number of micro-allocations and improves locality of data access.
This commit is contained in:
Edward Hervey
Edward Hervey
parent
a1aebe73d5
commit
1b568fa01f
1 changed files with 97 additions and 31 deletions
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@ -94,14 +94,24 @@ typedef struct
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/* owned by parent structure, NULL if no parent */
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gint *parent_refcount;
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GArray *fields;
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guint fields_len; /* Number of valid items in fields */
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guint fields_alloc; /* Allocated items in fields */
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/* Fields are allocated if GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY(),
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* else it's a pointer to the arr field. */
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GstStructureField *fields;
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GstStructureField arr[1];
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} GstStructureImpl;
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#define GST_STRUCTURE_REFCOUNT(s) (((GstStructureImpl*)(s))->parent_refcount)
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#define GST_STRUCTURE_FIELDS(s) (((GstStructureImpl*)(s))->fields)
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#define GST_STRUCTURE_LEN(s) (((GstStructureImpl*)(s))->fields_len)
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#define GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY(s) \
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(((GstStructureImpl*)(s))->fields != &((GstStructureImpl*)(s))->arr[0])
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#define GST_STRUCTURE_FIELD(structure, index) \
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&g_array_index(GST_STRUCTURE_FIELDS(structure), GstStructureField, (index))
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(&((GstStructureImpl*)(structure))->fields[(index)])
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#define IS_MUTABLE(structure) \
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(!GST_STRUCTURE_REFCOUNT(structure) || \
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@ -110,6 +120,54 @@ typedef struct
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#define IS_TAGLIST(structure) \
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(structure->name == GST_QUARK (TAGLIST))
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/* Replacement for g_array_append_val */
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static void
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_structure_append_val (GstStructure * s, GstStructureField * val)
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{
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GstStructureImpl *impl = (GstStructureImpl *) s;
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/* resize if needed */
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if (G_UNLIKELY (impl->fields_len == impl->fields_alloc)) {
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guint want_alloc;
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if (G_UNLIKELY (impl->fields_alloc > (G_MAXUINT / 2)))
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g_error ("Growing structure would result in overflow");
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want_alloc =
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MAX (GST_ROUND_UP_8 (impl->fields_len + 1), impl->fields_alloc * 2);
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if (GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY (s)) {
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impl->fields = g_renew (GstStructureField, impl->fields, want_alloc);
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} else {
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impl->fields = g_new0 (GstStructureField, want_alloc);
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memcpy (impl->fields, &impl->arr[0],
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impl->fields_len * sizeof (GstStructureField));
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GST_CAT_LOG (GST_CAT_PERFORMANCE, "Exceeding pre-allocated array");
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}
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impl->fields_alloc = want_alloc;
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}
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/* Finally set value */
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impl->fields[impl->fields_len++] = *val;
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}
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/* Replacement for g_array_remove_index */
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static inline void
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_structure_remove_index (GstStructure * s, guint idx)
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{
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GstStructureImpl *impl = (GstStructureImpl *) s;
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/* We never "reduce" the memory footprint. */
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if (idx >= impl->fields_len)
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return;
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/* Shift everything if it's not the last item */
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if (idx != impl->fields_len)
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memmove (&impl->fields[idx],
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&impl->fields[idx + 1],
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(impl->fields_len - idx - 1) * sizeof (GstStructureField));
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impl->fields_len--;
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}
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static void gst_structure_set_field (GstStructure * structure,
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GstStructureField * field);
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static GstStructureField *gst_structure_get_field (const GstStructure *
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@ -142,14 +200,24 @@ _priv_gst_structure_initialize (void)
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static GstStructure *
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gst_structure_new_id_empty_with_size (GQuark quark, guint prealloc)
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{
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guint n_alloc;
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GstStructureImpl *structure;
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structure = g_slice_new (GstStructureImpl);
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if (prealloc == 0)
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prealloc = 1;
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n_alloc = GST_ROUND_UP_8 (prealloc);
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structure =
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g_malloc0 (sizeof (GstStructureImpl) + (n_alloc -
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1) * sizeof (GstStructureField));
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((GstStructure *) structure)->type = _gst_structure_type;
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((GstStructure *) structure)->name = quark;
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GST_STRUCTURE_REFCOUNT (structure) = NULL;
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GST_STRUCTURE_FIELDS (structure) =
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g_array_sized_new (FALSE, FALSE, sizeof (GstStructureField), prealloc);
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structure->fields_len = 0;
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structure->fields_alloc = n_alloc;
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structure->fields = &structure->arr[0];
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GST_TRACE ("created structure %p", structure);
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@ -343,7 +411,7 @@ gst_structure_copy (const GstStructure * structure)
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g_return_val_if_fail (structure != NULL, NULL);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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new_structure = gst_structure_new_id_empty_with_size (structure->name, len);
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for (i = 0; i < len; i++) {
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@ -353,7 +421,7 @@ gst_structure_copy (const GstStructure * structure)
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new_field.name = field->name;
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gst_value_init_and_copy (&new_field.value, &field->value);
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g_array_append_val (GST_STRUCTURE_FIELDS (new_structure), new_field);
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_structure_append_val (new_structure, &new_field);
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}
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GST_CAT_TRACE (GST_CAT_PERFORMANCE, "doing copy %p -> %p",
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structure, new_structure);
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@ -377,7 +445,7 @@ gst_structure_free (GstStructure * structure)
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g_return_if_fail (structure != NULL);
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g_return_if_fail (GST_STRUCTURE_REFCOUNT (structure) == NULL);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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@ -385,13 +453,15 @@ gst_structure_free (GstStructure * structure)
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g_value_unset (&field->value);
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}
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}
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g_array_free (GST_STRUCTURE_FIELDS (structure), TRUE);
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if (GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY (structure))
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g_free (((GstStructureImpl *) structure)->fields);
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#ifdef USE_POISONING
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memset (structure, 0xff, sizeof (GstStructure));
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#endif
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GST_TRACE ("free structure %p", structure);
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g_slice_free1 (sizeof (GstStructureImpl), structure);
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g_free (structure);
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}
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/**
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@ -842,7 +912,7 @@ gst_structure_set_field (GstStructure * structure, GstStructureField * field)
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GType field_value_type;
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guint i, len;
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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field_value_type = G_VALUE_TYPE (&field->value);
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if (field_value_type == G_TYPE_STRING) {
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@ -903,7 +973,7 @@ gst_structure_set_field (GstStructure * structure, GstStructureField * field)
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}
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}
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g_array_append_val (GST_STRUCTURE_FIELDS (structure), *field);
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_structure_append_val (structure, field);
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}
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/* If there is no field with the given ID, NULL is returned.
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@ -914,7 +984,7 @@ gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
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GstStructureField *field;
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guint i, len;
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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@ -1009,7 +1079,7 @@ gst_structure_remove_field (GstStructure * structure, const gchar * fieldname)
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g_return_if_fail (IS_MUTABLE (structure));
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id = g_quark_from_string (fieldname);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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@ -1018,8 +1088,7 @@ gst_structure_remove_field (GstStructure * structure, const gchar * fieldname)
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if (G_IS_VALUE (&field->value)) {
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g_value_unset (&field->value);
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}
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GST_STRUCTURE_FIELDS (structure) =
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g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
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_structure_remove_index (structure, i);
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return;
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}
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}
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@ -1088,14 +1157,13 @@ gst_structure_remove_all_fields (GstStructure * structure)
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g_return_if_fail (structure != NULL);
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g_return_if_fail (IS_MUTABLE (structure));
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for (i = GST_STRUCTURE_FIELDS (structure)->len - 1; i >= 0; i--) {
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for (i = GST_STRUCTURE_LEN (structure) - 1; i >= 0; i--) {
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field = GST_STRUCTURE_FIELD (structure, i);
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if (G_IS_VALUE (&field->value)) {
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g_value_unset (&field->value);
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}
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GST_STRUCTURE_FIELDS (structure) =
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g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
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_structure_remove_index (structure, i);
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}
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}
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@ -1139,7 +1207,7 @@ gst_structure_n_fields (const GstStructure * structure)
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{
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g_return_val_if_fail (structure != NULL, 0);
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return GST_STRUCTURE_FIELDS (structure)->len;
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return GST_STRUCTURE_LEN (structure);
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}
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/**
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@ -1157,7 +1225,7 @@ gst_structure_nth_field_name (const GstStructure * structure, guint index)
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GstStructureField *field;
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g_return_val_if_fail (structure != NULL, NULL);
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g_return_val_if_fail (index < GST_STRUCTURE_FIELDS (structure)->len, NULL);
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g_return_val_if_fail (index < GST_STRUCTURE_LEN (structure), NULL);
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field = GST_STRUCTURE_FIELD (structure, index);
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@ -1188,7 +1256,7 @@ gst_structure_foreach (const GstStructure * structure,
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g_return_val_if_fail (structure != NULL, FALSE);
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g_return_val_if_fail (func != NULL, FALSE);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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@ -1225,7 +1293,7 @@ gst_structure_map_in_place (GstStructure * structure,
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g_return_val_if_fail (structure != NULL, FALSE);
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g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
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g_return_val_if_fail (func != NULL, FALSE);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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@ -1263,7 +1331,7 @@ gst_structure_filter_and_map_in_place (GstStructure * structure,
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g_return_if_fail (structure != NULL);
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g_return_if_fail (IS_MUTABLE (structure));
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g_return_if_fail (func != NULL);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len;) {
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field = GST_STRUCTURE_FIELD (structure, i);
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@ -1274,9 +1342,8 @@ gst_structure_filter_and_map_in_place (GstStructure * structure,
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if (G_IS_VALUE (&field->value)) {
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g_value_unset (&field->value);
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}
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GST_STRUCTURE_FIELDS (structure) =
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g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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_structure_remove_index (structure, i);
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len = GST_STRUCTURE_LEN (structure);
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} else {
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i++;
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}
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@ -1864,7 +1931,7 @@ priv_gst_structure_append_to_gstring (const GstStructure * structure,
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g_return_val_if_fail (s != NULL, FALSE);
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len = GST_STRUCTURE_FIELDS (structure)->len;
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len = GST_STRUCTURE_LEN (structure);
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for (i = 0; i < len; i++) {
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char *t;
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GType type;
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@ -2872,8 +2939,7 @@ gst_structure_is_equal (const GstStructure * structure1,
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if (structure1->name != structure2->name) {
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return FALSE;
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}
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if (GST_STRUCTURE_FIELDS (structure1)->len !=
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GST_STRUCTURE_FIELDS (structure2)->len) {
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if (GST_STRUCTURE_LEN (structure1) != GST_STRUCTURE_LEN (structure2)) {
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return FALSE;
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}
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