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    SubjectRe: Results: 2.2.0-pre5 vs arcavm10 vs arcavm9 vs arcavm7
    On 7 Jan 1999, Zlatko Calusic wrote:

    > 2) In pre-5, under heavy load, free memory is hovering around
    > freepages.min instead of being somewhere between freepages.low &
    > freepages.max. This could make trouble for bursts of atomic
    > allocations (networking!).

    Agreed and I just fixed that with my updates to the memory trashing
    heuristic (see also the second patch in one of my last emails).

    A new minimal patch against 2.2.0-pre5 is this:

    Index: page_alloc.c
    ===================================================================
    RCS file: /var/cvs/linux/mm/page_alloc.c,v
    retrieving revision 1.1.1.6
    diff -u -2 -r1.1.1.6 page_alloc.c
    --- page_alloc.c 1999/01/07 11:21:35 1.1.1.6
    +++ linux/mm/page_alloc.c 1999/01/07 19:34:58
    @@ -4,4 +4,5 @@
    * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
    * Swap reorganised 29.12.95, Stephen Tweedie
    + * trashing_memory heuristic. Copyright (C) 1999 Andrea Arcangeli
    */

    @@ -259,7 +260,4 @@
    * to free things up until things are better.
    *
    - * Normally we shouldn't ever have to do this, with
    - * kswapd doing this in the background.
    - *
    * Most notably, this puts most of the onus of
    * freeing up memory on the processes that _use_
    @@ -269,8 +267,9 @@
    if (!current->trashing_memory)
    goto ok_to_allocate;
    - if (nr_free_pages > freepages.low) {
    + if (nr_free_pages > freepages.high) {
    current->trashing_memory = 0;
    goto ok_to_allocate;
    - }
    + } else if (nr_free_pages > freepages.low)
    + goto ok_to_allocate;
    }
    /*


    The problem is that I don't know if it's going to hurt performances... If
    somebody would try it out would be helpful... I don't think it can
    hurt but...

    Andrea Arcangeli


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