[PATCH] lglock: add read-preference local-global rwlock

[Oleg Nesterov]

On 03/02, Michel Lespinasse wrote:
>
> My version would be slower if it needs to take the
> slow path in a reentrant way, but I'm not sure it matters either :)

I'd say, this doesn't matter at all, simply because this can only happen
if we race with the active writer.

Oleg.