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[S390] add support for nonquiescing sske

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Improve performance of the sske operation by using the nonquiescing
variant if the affected page has no mappings established. On machines
with no support for the new sske variant the mask bit will be ignored.

Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Martin Schwidefsky 2010-10-25 16:10:14 +02:00 • committed by Martin Schwidefsky
commit e2b8d7af0e
7 changed files with 18 additions and 12 deletions
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4
mm/rmap.c
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@ -745,7 +745,7 @@ int page_mkclean(struct page *page)
if (mapping) {
ret = page_mkclean_file(mapping, page);
if (page_test_dirty(page)) {
page_clear_dirty(page);
page_clear_dirty(page, 1);
ret = 1;
}
}
@ -942,7 +942,7 @@ void page_remove_rmap(struct page *page)
* containing the swap entry, but page not yet written to swap.
*/
if ((!PageAnon(page) || PageSwapCache(page)) && page_test_dirty(page)) {
page_clear_dirty(page);
page_clear_dirty(page, 1);
set_page_dirty(page);
}
/*