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    Subject[RFC][PATCH] vm_swap_full

    I my opinion, basing the vm_swap_full test on the size of swap is bogus.
    If you have a 512M box with 128M of swap its a good idea to always release
    aggressively. If the same box has 2G of swap (has /tmp on tmpfs maybe), it
    does not make sense to start the agressive release at 1G. I suggest the
    following makes more sense.

    --- linux/include/linux/swap.h.orig Sun Nov 4 09:30:14 2001
    +++ linux/include/linux/swap.h Sun Nov 4 09:32:46 2001
    @@ -80,8 +80,8 @@

    extern int nr_swap_pages;

    -/* Swap 50% full? Release swapcache more aggressively.. */
    -#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages)
    +/* Free swap less than inactive pages? Release swapcache more aggressively.. */
    +#define vm_swap_full() (nr_swap_pages < nr_inactive_pages)

    extern unsigned int nr_free_pages(void);
    extern unsigned int nr_free_buffer_pages(void);
    This starts aggressive swaping when the ammount of space left in swap is
    less than the size of the inactive pages.

    Ed Tomlinson
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