On 11 November 2012 13:40, Alan Cox <[email protected]> wrote: > > Agreed. Once upon time, before SMPng, M_NOWAIT was rarely used. It was > well understand that it should only be used by interrupt handlers. > > The trouble is that M_NOWAIT conflates two orthogonal things. The obvious > being that the allocation shouldn't sleep. The other being how far we're > willing to deplete the cache/free page queues. > > When fine-grained locking got sprinkled throughout the kernel, we all to > often found ourselves wanting to do allocations without the possibility of > blocking. So, M_NOWAIT became commonplace, where it wasn't before.
Well, what's the current set of best practices for allocating mbufs? I don't mind going through ath(4) and net80211(4), looking to make it behave better with mbuf allocations. There's 49 M_NOWAIT's in net80211 and 10 in ath(4). I wonder how many of them are synonyms with "don't fail allocating", too. Hm. Adrian _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
