/* Process one page of b during a union op */
static void
tbm_union_page(HashBitmap *a, const PagetableEntry *bpage)
{
PagetableEntry *apage;
int wordnum;
if (bpage->ischunk)
{
/* Scan b's chunk, mark each indicated page lossy in a */
for (wordnum = 0; wordnum < WORDS_PER_PAGE; wordnum++)
{
tbm_bitmapword w = bpage->words[wordnum];
if (w != 0)
{
BlockNumber pg;
pg = bpage->blockno + (wordnum * TBM_BITS_PER_BITMAPWORD);
while (w != 0)
{
if (w & 1)
tbm_mark_page_lossy(a, pg);
pg++;
w >>= 1;
}
}
}
}
/*
* tbm_add_page - add a whole page to a TIDBitmap
*
* This causes the whole page to be reported (with the recheck flag)
* when the TIDBitmap is scanned.
*/
void
tbm_add_page(TIDBitmap *tbm, BlockNumber pageno)
{
/* Enter the page in the bitmap, or mark it lossy if already present */
tbm_mark_page_lossy(tbm, pageno);
/* If we went over the memory limit, lossify some more pages */
if (tbm->nentries > tbm->maxentries)
tbm_lossify(tbm);
}