On (02/02/15 11:45), Minchan Kim wrote:
> On Mon, Feb 02, 2015 at 10:59:40AM +0900, Sergey Senozhatsky wrote:
> > On (02/02/15 10:43), Minchan Kim wrote:
> > > > static inline int init_done(struct zram *zram)
> > > > {
> > > > - return zram->meta != NULL;
> > > > + return atomic_read(&zram->refcount);
> > >
> > > As I said previous mail, it could make livelock so I want to use disksize
> > > in here to prevent further I/O handling.
> >
> > just as I said in my previous email -- is this live lock really possible?
> > we need to umount device to continue with reset. and umount will kill IOs out
> > of our way.
> >
> > the other reset caller is __exit zram_exit(). but once again, I don't
> > expect this function being executed on mounted device and module being
> > in use.
> >
> >
> > > > +static inline void zram_put(struct zram *zram)
> > > > +{
> > > > + if (atomic_dec_and_test(&zram->refcount))
> > > > + complete(&zram->io_done);
> > > > +}
> > >
> > > Although I suggested this complete, it might be rather overkill(pz,
> > > understand me it was work in midnight. :))
> > > Instead, we could use just atomic_dec in here and
> > > use wait_event(event, atomic_read(&zram->refcount) == 0) in reset.
> > >
> >
> > yes, I think it can do the trick.
>
> Hey, it's not a trick. It suits for the our goal well. Completion
> was too much, I think.
>
sure :)
-ss
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