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    Subject[PATCH 18/23] mm: count writeback pages per BDI
    Count per BDI writeback pages.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    ---
    include/linux/backing-dev.h | 1 +
    mm/page-writeback.c | 12 ++++++++++--
    2 files changed, 11 insertions(+), 2 deletions(-)

    Index: linux-2.6/mm/page-writeback.c
    ===================================================================
    --- linux-2.6.orig/mm/page-writeback.c
    +++ linux-2.6/mm/page-writeback.c
    @@ -981,14 +981,18 @@ int test_clear_page_writeback(struct pag
    int ret;

    if (mapping) {
    + struct backing_dev_info *bdi = mapping->backing_dev_info;
    unsigned long flags;

    write_lock_irqsave(&mapping->tree_lock, flags);
    ret = TestClearPageWriteback(page);
    - if (ret)
    + if (ret) {
    radix_tree_tag_clear(&mapping->page_tree,
    page_index(page),
    PAGECACHE_TAG_WRITEBACK);
    + if (bdi_cap_writeback_dirty(bdi))
    + __dec_bdi_stat(bdi, BDI_WRITEBACK);
    + }
    write_unlock_irqrestore(&mapping->tree_lock, flags);
    } else {
    ret = TestClearPageWriteback(page);
    @@ -1004,14 +1008,18 @@ int test_set_page_writeback(struct page
    int ret;

    if (mapping) {
    + struct backing_dev_info *bdi = mapping->backing_dev_info;
    unsigned long flags;

    write_lock_irqsave(&mapping->tree_lock, flags);
    ret = TestSetPageWriteback(page);
    - if (!ret)
    + if (!ret) {
    radix_tree_tag_set(&mapping->page_tree,
    page_index(page),
    PAGECACHE_TAG_WRITEBACK);
    + if (bdi_cap_writeback_dirty(bdi))
    + __inc_bdi_stat(bdi, BDI_WRITEBACK);
    + }
    if (!PageDirty(page))
    radix_tree_tag_clear(&mapping->page_tree,
    page_index(page),
    Index: linux-2.6/include/linux/backing-dev.h
    ===================================================================
    --- linux-2.6.orig/include/linux/backing-dev.h
    +++ linux-2.6/include/linux/backing-dev.h
    @@ -28,6 +28,7 @@ typedef int (congested_fn)(void *, int);

    enum bdi_stat_item {
    BDI_RECLAIMABLE,
    + BDI_WRITEBACK,
    NR_BDI_STAT_ITEMS
    };

    --

    -
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