On Tue, May 29, 2018 at 10:03:38AM -0700, Davidlohr Bueso wrote:
> On Mon, 28 May 2018, Herbert Xu wrote:
> > > + /*
> > > + * This is api initialization and thus we need to guarantee the
> > > + * initial rhashtable allocation. Upon failure, retry with a
> > > + * smallest possible size, otherwise we exhaust our options with
> > > + * __GFP_NOFAIL.
> > > + */
> > > tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
> > > - if (tbl == NULL)
> > > - return -ENOMEM;
> > > + if (unlikely(tbl == NULL)) {
> > > + size = HASH_MIN_SIZE;
> > > +
> > > + tbl = bucket_table_alloc(ht, size, GFP_KERNEL);
> > > + if (tbl == NULL)
> > > + tbl = bucket_table_alloc_retry(ht, size, GFP_KERNEL);
> > > + }
> >
> > Perhaps you should also explain here why we don't just try the
> > minimum size with __GFP_NOFAIL as the second step rather than the
> > third.
>
> Please see the comment above, I try to explain the rationale.
It doesn't explain it at all. In fact I don't see why we neeed
three attempts, just do the GFP_NOFAIL as the second and final step.
Thanks,
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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