Hi,
first of all I hope this patching in of the Mesage-ID works for threaded
views :-)
On 13/02/14 10:42:31, Mel Gorman wrote:
>
>
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>
> List: linux-mm
> Subject: [PATCH] mm: swap: Use swapfiles in priority order
> From: Mel Gorman <mgorman () suse ! de>
> Date: 2014-02-13 10:42:31
> Message-ID: 20140213104231.GX6732 () suse ! de
> [Download message RAW]
>
> According to the swapon documentation
>
> Swap pages are allocated from areas in priority order,
> highest priority first. For areas with different priorities, a
> higher-priority area is exhausted before using a lower-priority area.
>
> A user reported
That was me and I can confirm that for all my setup were we encountered
the issue is fixed with the new patch.
On top of that it also fixed a long running issue that swap gets slower
the more swap targets you have - which was formerly discussed in detail
here http://www.spinics.net/lists/linux-mm/msg68624.html
> that the reality is different. When multiple swap files
> are enabled and a memory consumer started, the swap files are consumed in
> pairs after the highest priority file is exhausted. Early in the lifetime
> of the test, swapfile consumptions looks like
>
[...]
>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
> ---
> mm/swapfile.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 4a7f7e6..6d0ac2b 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -651,7 +651,7 @@ swp_entry_t get_swap_page(void)
> goto noswap;
> atomic_long_dec(&nr_swap_pages);
>
> - for (type = swap_list.next; type >= 0 && wrapped < 2; type = next) {
> + for (type = swap_list.head; type >= 0 && wrapped < 2; type = next) {
> hp_index = atomic_xchg(&highest_priority_index, -1);
> /*
> * highest_priority_index records current highest priority swap
--
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