[ofa-general] Re: [PATCH 17/21] RDS/IB: Receive datagrams via IB
Olaf Kirch
okir at suse.de
Thu Jan 29 13:02:28 PST 2009
On Thursday 29 January 2009 03:20:40 Andy Grover wrote:
> > This is racy. You check if you're at the limit, do the allocation, and
> > then increment the atomic rds_ib_allocation count. So many threads can
> > pass the atomic_read() test and then take you over the limit. If you
> > want to make it safe then you could do atomic_inc_return() and check if
> > that took you over the limit.
>
> Woah, yup, thanks.
The refill code used to be single-threaded; and I think it still is. So
this can't race I think
Olaf
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