On Wed, 2012-12-12 at 16:53 -0500, Rik van Riel wrote:
> On 12/12/2012 04:43 PM, Johannes Weiner wrote:
> > dc0422c "mm: vmscan: only evict file pages when we have plenty" makes
> > 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 <han...@cmpxchg.org>
> > ---
> > 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;
> > }
> > }
> >
> >
>
> I believe the if() block should be moved to AFTER
> the check where we make sure we actually have enough
> file pages.
Where check enough file pages?
if (unlikely(file + free <= high_wmark_pages(zone))), correct?
>
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