Eric Dumazet wrote:
On Tuesday 08 August 2006 18:34, Nick Piggin wrote:
Eric Dumazet wrote:
We certainly can. But if you insist of using mmap sem at all, then we
have a problem.
rbtree would not reduce cacheline bouncing, so :
We could use a hashtable (allocated on demand) of size N, N depending on
NR_CPUS for example. each chain protected by a private spinlock. If N is
well chosen, we might reduce lock cacheline bouncing. (different threads
fighting on different private futexes would have a good chance to get
different cachelines in this hashtable)
See other mail. We already have a hash table ;)
Yes but still you want at FUTEX_WAIT time to tell the kernel the futex is
private to this process.
Yes, but I'm saying we already have a hash table. The hash table.
I'm *not* saying you *don't* also want a private directive from userspace.
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