Re: [PATCH 2/2] rcu: eliminate rcu_data.last_qsctr

[William Lee Irwin III]

On Sun, Nov 28, 2004 at 06:06:55PM +0300, Oleg Nesterov wrote:
> Is the rcu_data.last_qsctr really needed?
> It is used in rcu_check_quiescent_state() exclusively.
> I think we can reset qsctr at the start of the grace period,
> and then just test qsctr against 0.

That might work if there were only 1 cpu. The local cpu owns ->qsctr,
->last_qsctr is stored and loaded by remote cpus under locks.


-- wli
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/