On Wed, 2012-12-12 at 16:43 -0500, Johannes Weiner wrote:
> When a reclaim scanner is doing its final scan before giving up and
> there is swap space available, pay no attention to swappiness
> preference anymore. Just swap.
>
Confuse! If it's final scan and still swap space available, why nr[lru]
= div64_u64(scan * fraction[file], denominator); instead of nr[lru] =
scan; ?
> Note that this change won't make too big of a difference for general
> reclaim: anonymous pages are already force-scanned when there is only
> very little file cache left, and there very likely isn't when the
> reclaimer enters this final cycle.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> ---
> mm/vmscan.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 3874dcb..6e53446 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1751,7 +1751,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
> unsigned long scan;
>
> scan = get_lru_size(lruvec, lru);
> - if (sc->priority || noswap || !vmscan_swappiness(sc)) {
> + if (sc->priority || noswap) {
> scan >>= sc->priority;
> if (!scan && force_scan)
> scan = SWAP_CLUSTER_MAX;
--
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