On Mon, 22 Sep 2014 09:03:08 +0900 Minchan Kim <minchan@xxxxxxxxxx> wrote:
> Now, swap leans on !p->highest_bit to indicate a swap is full.
> It works well for normal swap because every slot on swap device
> is used up when the swap is full but in case of zram, swap sees
> still many empty slot although backed device(ie, zram) is full
> since zram's limit is over so that it could make trouble when
> swap use highest_bit to select new slot via free_cluster.
>
> This patch introduces full varaiable in swap_info_struct
> to solve the problem.
>
> ...
>
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -224,6 +224,7 @@ struct swap_info_struct {
> struct swap_cluster_info free_cluster_tail; /* free cluster list tail */
> unsigned int lowest_bit; /* index of first free in swap_map */
> unsigned int highest_bit; /* index of last free in swap_map */
> + bool full; /* whether swap is full or not */
This is protected by swap_info_struct.lock, I worked out.
There's a large comment at swap_info_struct.lock which could be updated.
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