On (06/22/16 11:27), Ganesh Mahendran wrote:
[..]
> > > Signed-off-by: Ganesh Mahendran <opensource.gan...@gmail.com>
> > > ---
> > > 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.
hm, looking at ->scan (lowmem_scan) shouldn't it return SHRINK_STOP
when it has nothing to free instead of 0?
-ss
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