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    Subject[PATCH] fork() failing

    Linus,

    As you know, we currently allow 1-order allocations to fail easily.

    However, there is one special case of 1-order allocations which cannot
    fail: fork.

    Here is the tested patch against pre4.

    --- linux.orig/mm/page_alloc.c Thu Oct 18 14:26:28 2001
    +++ linux/mm/page_alloc.c Thu Oct 18 16:23:15 2001
    @@ -393,8 +393,13 @@
    }
    }

    - /* Don't let big-order allocations loop */
    - if (order)
    + /* We have one special 1-order alloc user: fork().
    + * It obviously cannot fail easily like other
    + * high order allocations. This could also be fixed
    + * by having a __GFP_LOOP flag to indicate that the
    + * high order allocation is "critical".
    + */
    + if (order > 1)
    return NULL;

    /* Yield for kswapd, and try again */
    -
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