Eric Lee / smarc-fsl-linux-kernel

22 Jun, 2005

1 commit

  • c475a8ab6   [PATCH] can_share_swap_page: use page_mapcount ... Browse Code »

    Remember that ironic get_user_pages race? when the raised page_count on a
    page swapped out led do_wp_page to decide that it had to copy on write, so
    substituted a different page into userspace. 2.6.7 onwards have Andrea's
    solution, where try_to_unmap_one backs out if it finds page_count raised.

    Which works, but is unsatisfying (rmap.c has no other page_count heuristics),
    and was found a few months ago to hang an intensive page migration test. A
    year ago I was hesitant to engage page_mapcount, now it seems the right fix.

    So remove the page_count hack from try_to_unmap_one; and use activate_page in
    unuse_mm when dropping lock, to replace its secondary effect of helping
    swapoff to make progress in that case.

    Simplify can_share_swap_page (now called only on anonymous pages) to check
    page_mapcount + page_swapcount == 1: still needs the page lock to stabilize
    their (pessimistic) sum, but does not need swapper_space.tree_lock for that.

    In do_swap_page, move swap_free and unlock_page below page_add_anon_rmap, to
    keep sum on the high side, and correct when can_share_swap_page called.

    Signed-off-by: Hugh Dickins
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Hugh Dickins
     

25 May, 2005

1 commit

  • cafdd8ba0   [PATCH] try_to_unmap_cluster() passes out-of-bounds pte to pte_unmap() ... Browse Code »

    try_to_unmap_cluster() does:
    for (pte = pte_offset_map(pmd, address);
    address < end; pte++, address += PAGE_SIZE) {
    ...
    }

    pte_unmap(pte);

    It may take a little staring to notice, but pte can actually fall off the
    end of the pte page in this iteration, which makes life difficult for
    kmap_atomic() and the users not expecting it to BUG(). Of course, we're
    somewhat lucky in that arithmetic elsewhere in the function guarantees that
    at least one iteration is made, lest this force larger rearrangements to be
    made. This issue and patch also apply to non-mm mainline and with trivial
    adjustments, at least two related kernels.

    Discovered during internal testing at Oracle.

    Signed-off-by: William Irwin
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    William Lee Irwin III
     

17 May, 2005

1 commit

01 May, 2005

1 commit

  • 81b4082dc   [PATCH] mm: rmap.c cleanup ... Browse Code »

    mm/rmap.c:page_referenced_one() and mm/rmap.c:try_to_unmap_one() contain
    identical code that

    - takes mm->page_table_lock;

    - drills through page tables;

    - checks that correct pte is reached.

    Coalesce this into page_check_address()

    Signed-off-by: Nikita Danilov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nikita Danilov
     

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds