Messages in this thread | | | Date | Sun, 28 Nov 2004 19:12:38 +0300 | From | Oleg Nesterov <> | Subject | Re: [PATCH 2/2] rcu: eliminate rcu_data.last_qsctr |
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William Lee Irwin III wrote: > > 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.
How can it be?
Afaics, the whole rcu_data is cpu local.
If i am wrong, could you please clarify?
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