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    SubjectRe: [RFC] 2.3.39 zone balancing
    On Thu, 13 Jan 2000, Rik van Riel wrote:

    >Now we'll only want to build something into kswapd
    >so that rebalancing the high memory zones is done in
    >the background.

    You never need to rebance the bigmem between 1g and 64g withing kswapd.
    This because bh/irq handlers are not going to use it. So kswapd has to
    care only about the memory below the bigmem boundary.

    BTW I just noticed currently (2.3.40pre1) kswapd is completly
    screwedup. kswapd should still do:

    while (nr_free_pages - nr_free_bigpages < freepages.high)

    exactly like in our early 2.3.18 bigmem code because _nothing_ is changed
    is the basic MM design since that time.

    The fix against 2.3.40pre1 to re-activate kswapd is this:

    --- 2.3.40pre1/mm/vmscan.c Sun Jan 9 20:45:31 2000
    +++ /tmp/vmscan.c Thu Jan 13 21:09:33 2000
    @@ -503,7 +503,7 @@
    do {
    /* kswapd is critical to provide GFP_ATOMIC
    allocations (not GFP_HIGHMEM ones). */
    - if (nr_free_buffer_pages() >= freepages.high)
    + if (nr_free_pages() - nr_free_highpages() >= freepages.high)
    break;
    if (!do_try_to_free_pages(GFP_KSWAPD, 0))
    break;

    Andrea


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