Hi, David:
On Tue, Jun 21, 2016 at 01:22:00PM -0700, David Rientjes wrote:
> On Tue, 21 Jun 2016, Ganesh Mahendran wrote:
>
> > lowmem_count() should only count anon pages when we have swap device.
> >
>
> Why?
I make a mistake. I thought lowmem_count will return the shrinkalbe page
of a process.
>
> > Signed-off-by: Ganesh Mahendran <opensource.ganesh@xxxxxxxxx>
> > ---
> > drivers/staging/android/lowmemorykiller.c | 12 ++++++++----
> > 1 file changed, 8 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/staging/android/lowmemorykiller.c b/drivers/staging/android/lowmemorykiller.c
> > index 6da9260..1d8de47 100644
> > --- a/drivers/staging/android/lowmemorykiller.c
> > +++ b/drivers/staging/android/lowmemorykiller.c
> > @@ -73,10 +73,14 @@ static unsigned long lowmem_deathpending_timeout;
> > static unsigned long lowmem_count(struct shrinker *s,
> > struct shrink_control *sc)
> > {
> > - return global_page_state(NR_ACTIVE_ANON) +
> > - global_page_state(NR_ACTIVE_FILE) +
> > - global_page_state(NR_INACTIVE_ANON) +
> > - global_page_state(NR_INACTIVE_FILE);
> > + unsigned long freeable = global_page_state(NR_ACTIVE_FILE) +
> > + global_page_state(NR_INACTIVE_FILE);
> > +
> > + if (get_nr_swap_pages() > 0)
> > + freeable += global_page_state(NR_ACTIVE_ANON) +
> > + global_page_state(NR_INACTIVE_ANON);
> > +
> > + return freeable;
> > }
> >
> > static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
>
> Shouldn't this be advertising the amount of memory that is freeable by
> killing the process with the highest priority oom_score_adj? It's not
> legitimate to say it can free all anon and file memory if nothing is oom
> killable, so this function is wrong both originally and with your patched
> version.
Yes, so should we just simply return 1 to make do_shrink_slab() go ahead?
Then lowmem_scan() will do the real job to scan all the process.
Thanks.
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