On Tue, 2006-04-11 at 01:54 -0600, Andreas Dilger wrote:
> On Apr 10, 2006 18:09 -0700, Mingming Cao wrote:
> > +static void __percpu_counter_mod(struct percpu_counter *fbc, long amount,
> > + int ul_overflow_check)
> > {
> > + * Before updating the global counter, if we detect the
> > + * updated new value will cause overflow, then we should not
> > + * do the update from this local counter at this moment. (i.e.
> > + * the local counter will not be cleared right now). The update
> > + * will be deferred at some point until either other local
> > + * counter updated the global counter first, or the local
> > + * counter's value will not cause global counter overflow.
>
> Wouldn't it be better to update the counter by the maximum amount possible
> to avoid overflow/underflow?
>
Yep. Thanks for pointing this out.:)
Mingming
> Cheers, Andreas
> --
> Andreas Dilger
> Principal Software Engineer
> Cluster File Systems, Inc.
>
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