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    Subject[PATCH 3/9] clockpro-PG_test.patch
    Date

    From: Peter Zijlstra <a.p.zijlstra@chello.nl>

    Introduce a new PG_flag, needed for the clockpro work.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

    include/linux/page-flags.h | 8 ++++++++
    mm/page_alloc.c | 3 ++-
    2 files changed, 10 insertions(+), 1 deletion(-)

    Index: linux-2.6-git/include/linux/page-flags.h
    ===================================================================
    --- linux-2.6-git.orig/include/linux/page-flags.h
    +++ linux-2.6-git/include/linux/page-flags.h
    @@ -76,6 +76,8 @@
    #define PG_nosave_free 18 /* Free, should not be written */
    #define PG_uncached 19 /* Page has been mapped as uncached */

    +#define PG_test 20 /* Page is in its test period */
    +
    /*
    * Global page accounting. One instance per CPU. Only unsigned longs are
    * allowed.
    @@ -303,6 +305,12 @@ extern void __mod_page_state(unsigned lo
    #define SetPageUncached(page) set_bit(PG_uncached, &(page)->flags)
    #define ClearPageUncached(page) clear_bit(PG_uncached, &(page)->flags)

    +#define PageTest(page) test_bit(PG_test, &(page)->flags)
    +#define SetPageTest(page) set_bit(PG_test, &(page)->flags)
    +#define TestSetPageTest(page) test_and_set_bit(PG_test, &(page)->flags)
    +#define ClearPageTest(page) clear_bit(PG_test, &(page)->flags)
    +#define TestClearPageTest(page) test_and_clear_bit(PG_test, &(page)->flags)
    +
    struct page; /* forward declaration */

    int test_clear_page_dirty(struct page *page);
    Index: linux-2.6-git/mm/page_alloc.c
    ===================================================================
    --- linux-2.6-git.orig/mm/page_alloc.c
    +++ linux-2.6-git/mm/page_alloc.c
    @@ -499,7 +499,8 @@ static int prep_new_page(struct page *pa

    page->flags &= ~(1 << PG_uptodate | 1 << PG_error |
    1 << PG_referenced | 1 << PG_arch_1 |
    - 1 << PG_checked | 1 << PG_mappedtodisk);
    + 1 << PG_checked | 1 << PG_mappedtodisk |
    + 1 << PG_test);
    set_page_private(page, 0);
    set_page_refs(page, order);
    kernel_map_pages(page, 1 << order, 1);
    -
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