On Wed, 2012-12-12 at 16:43 -0500, Johannes Weiner wrote:
> dc0422c "mm: vmscan: only evict file pages when we have plenty" makes
Can't find dc0422c.
> a point of not going for anonymous memory while there is still enough
> inactive cache around.
>
> The check was added only for global reclaim, but it is just as useful
> for memory cgroup reclaim.
>
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
> ---
> mm/vmscan.c | 19 ++++++++++---------
> 1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 157bb11..3874dcb 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1671,6 +1671,16 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
> denominator = 1;
> goto out;
> }
> + /*
> + * There is enough inactive page cache, do not reclaim
> + * anything from the anonymous working set right now.
> + */
> + if (!inactive_file_is_low(lruvec)) {
> + fraction[0] = 0;
> + fraction[1] = 1;
> + denominator = 1;
> + goto out;
> + }
>
> anon = get_lru_size(lruvec, LRU_ACTIVE_ANON) +
> get_lru_size(lruvec, LRU_INACTIVE_ANON);
> @@ -1688,15 +1698,6 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
> fraction[1] = 0;
> denominator = 1;
> goto out;
> - } else if (!inactive_file_is_low_global(zone)) {
> - /*
> - * There is enough inactive page cache, do not
> - * reclaim anything from the working set right now.
> - */
> - fraction[0] = 0;
> - fraction[1] = 1;
> - denominator = 1;
> - goto out;
> }
> }
>
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