Beispiel #1
0
int
page_szc_lock_assert(page_t *pp)
{
	page_t *rootpp = PP_PAGEROOT(pp);
	kmutex_t *mtx = PAGE_SZC_MUTEX(rootpp);

	return (MUTEX_HELD(mtx));
}
Beispiel #2
0
/*
 * Page retire self-test. For now, it always returns 0.
 */
int
page_retire_test(void)
{
	page_t *first, *pp, *cpp, *cpp2, *lpp;

	/*
	 * Tests the corner case where a large page can't be retired
	 * because one of the constituent pages is locked. We mark
	 * one page to be retired and try to retire it, and mark the
	 * other page to be retired but don't try to retire it, so
	 * that page_unlock() in the failure path will recurse and try
	 * to retire THAT page. This is the worst possible situation
	 * we can get ourselves into.
	 */
	memsegs_lock(0);
	pp = first = page_first();
	do {
		if (pp->p_szc && PP_PAGEROOT(pp) == pp) {
			cpp = pp + 1;
			lpp = PP_ISFREE(pp)? pp : pp + 2;
			cpp2 = pp + 3;
			if (!page_trylock(lpp, pp == lpp? SE_EXCL : SE_SHARED))
				continue;
			if (!page_trylock(cpp, SE_EXCL)) {
				page_unlock(lpp);
				continue;
			}
			page_settoxic(cpp, PR_FMA | PR_BUSY);
			page_settoxic(cpp2, PR_FMA);
			page_tryretire(cpp);	/* will fail */
			page_unlock(lpp);
			(void) page_retire(cpp->p_pagenum, PR_FMA);
			(void) page_retire(cpp2->p_pagenum, PR_FMA);
		}
	} while ((pp = page_next(pp)) != first);
	memsegs_unlock(0);

	return (0);
}