Eric Lee / smarc-fsl-linux-kernel

08 May, 2007

1 commit

  • d85f33855   Make page->private usable in compound pages ... Browse Code »

    If we add a new flag so that we can distinguish between the first page and the
    tail pages then we can avoid to use page->private in the first page.
    page->private == page for the first page, so there is no real information in
    there.

    Freeing up page->private makes the use of compound pages more transparent.
    They become more usable like real pages. Right now we have to be careful f.e.
    if we are going beyond PAGE_SIZE allocations in the slab on i386 because we
    can then no longer use the private field. This is one of the issues that
    cause us not to support debugging for page size slabs in SLAB.

    Having page->private available for SLUB would allow more meta information in
    the page struct. I can probably avoid the 16 bit ints that I have in there
    right now.

    Also if page->private is available then a compound page may be equipped with
    buffer heads. This may free up the way for filesystems to support larger
    blocks than page size.

    We add PageTail as an alias of PageReclaim. Compound pages cannot currently
    be reclaimed. Because of the alias one needs to check PageCompound first.

    The RFC for the this approach was discussed at
    http://marc.info/?t=117574302800001&r=1&w=2

    [nacc@us.ibm.com: fix hugetlbfs]
    Signed-off-by: Christoph Lameter
    Signed-off-by: Nishanth Aravamudan
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Christoph Lameter
     

26 Sep, 2006

1 commit

  • 725d704ec   [PATCH] mm: VM_BUG_ON ... Browse Code »

    Introduce a VM_BUG_ON, which is turned on with CONFIG_DEBUG_VM. Use this
    in the lightweight, inline refcounting functions; PageLRU and PageActive
    checks in vmscan, because they're pretty well confined to vmscan. And in
    page allocate/free fastpaths which can be the hottest parts of the kernel
    for kbuilds.

    Unlike BUG_ON, VM_BUG_ON must not be used to execute statements with
    side-effects, and should not be used outside core mm code.

    Signed-off-by: Nick Piggin
    Cc: Hugh Dickins
    Cc: Christoph Lameter
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

22 Mar, 2006

3 commits

  • 7835e98b2   [PATCH] remove set_page_count() outside mm/ ... Browse Code »

    set_page_count usage outside mm/ is limited to setting the refcount to 1.
    Remove set_page_count from outside mm/, and replace those users with
    init_page_count() and set_page_refcounted().

    This allows more debug checking, and tighter control on how code is allowed
    to play around with page->_count.

    Signed-off-by: Nick Piggin
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     
  • 84097518d   [PATCH] mm: nommu use compound pages ... Browse Code »

    Now that compound page handling is properly fixed in the VM, move nommu
    over to using compound pages rather than rolling their own refcounting.

    nommu vm page refcounting is broken anyway, but there is no need to have
    divergent code in the core VM now, nor when it gets fixed.

    Signed-off-by: Nick Piggin
    Cc: David Howells

    (Needs testing, please).
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     
  • 0f8053a50   [PATCH] mm: make __put_page internal ... Browse Code »

    Remove __put_page from outside the core mm/. It is dangerous because it does
    not handle compound pages nicely, and misses 1->0 transitions. If a user
    later appears that really needs the extra speed we can reevaluate.

    Signed-off-by: Nick Piggin
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

07 Jan, 2006

2 commits

  • a226f6c89   [PATCH] FRV: Clean up bootmem allocator's page freeing algorithm ... Browse Code »

    The attached patch cleans up the way the bootmem allocator frees pages.

    A new function, __free_pages_bootmem(), is provided in mm/page_alloc.c that is
    called from mm/bootmem.c to turn pages over to the main allocator. All the
    bits of code to initialise pages (clearing PG_reserved and setting the page
    count) are moved to here. The checks on page validity are removed, on the
    assumption that the struct page arrays will have been prepared correctly.

    Signed-off-by: David Howells
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    David Howells
     
  • 77a8a7883   [PATCH] mm: set_page_refs opt ... Browse Code »

    Inline set_page_refs.

    Signed-off-by: Nick Piggin
    Cc: Hugh Dickins
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

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