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    SubjectRe: Pagecache: find_or_create_page does not call a proper page allocator function
    And the second fix (cleanup patch will follow)

    Pagecache: find_or_create_page does not spread memory.

    The find_or_create function calls alloc_page with the gfp_mask passed to it
    which is derived from the mappings gfp mask. So the allocation flags are right
    (assuming my bugfix to fs/buffer.c is applied).

    However, we call a alloc_page instead of page_cache_alloc in find_or_create_page.
    This means that the page cache allocation will not obey cpuset memory spreading.

    We really need to call __page_cache_alloc there.

    Also stick a comment in there explaining how the allocation mask passed to
    find_or_create_page needs to be handled.

    Signed-off-by: Christoph Lameter <>

    mm/filemap.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    Index: linux-2.6.21-rc7/mm/filemap.c
    --- linux-2.6.21-rc7.orig/mm/filemap.c 2007-04-23 15:37:27.000000000 -0700
    +++ linux-2.6.21-rc7/mm/filemap.c 2007-04-23 15:38:09.000000000 -0700
    @@ -648,7 +648,8 @@ EXPORT_SYMBOL(find_lock_page);
    * find_or_create_page - locate or add a pagecache page
    * @mapping: the page's address_space
    * @index: the page's index into the mapping
    - * @gfp_mask: page allocation mode
    + * @gfp_mask: page allocation mode. This must be derived from the
    + * allocation flags of the mapping!
    * Locates a page in the pagecache. If the page is not present, a new page
    * is allocated using @gfp_mask and is added to the pagecache and to the VM's
    @@ -670,7 +671,8 @@ repeat:
    page = find_lock_page(mapping, index);
    if (!page) {
    if (!cached_page) {
    - cached_page = alloc_page(gfp_mask);
    + cached_page =
    + __page_cache_alloc(gfp_mask);
    if (!cached_page)
    return NULL;
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      Last update: 2007-04-24 00:45    [W:0.020 / U:5.604 seconds]
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