When shadowing objects, adjust the page coloring of the shadowing object
such that pages in the combined/shadowed object are consistantly colored. Submitted by: "John S. Dyson" <dyson@iquest.net>
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@ -61,7 +61,7 @@
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_object.c,v 1.143 1999/02/03 01:57:17 dillon Exp $
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* $Id: vm_object.c,v 1.144 1999/02/04 17:47:52 dillon Exp $
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*/
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/*
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@ -936,6 +936,10 @@ vm_object_shadow(object, offset, length)
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* Our caller changes his reference to point to the new object,
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* removing a reference to the source object. Net result: no change
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* of reference count.
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*
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* Try to optimize the result object's page color when shadowing
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* in order to maintain page coloring consistancy in the combined
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* shadowed object.
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*/
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result->backing_object = source;
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if (source) {
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@ -943,6 +947,7 @@ vm_object_shadow(object, offset, length)
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vm_object_clear_flag(source, OBJ_ONEMAPPING);
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source->shadow_count++;
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source->generation++;
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result->pg_color = (source->pg_color + OFF_TO_IDX(*offset)) & PQ_L2_MASK;
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}
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/*
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