linux-kernel - RCU: Question on force_qs

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Date:   Mon, 14 Sep 2020 07:55:18 +0000
From:   "Zhang, Qiang" <Qiang.Zhang@...driver.com>
To:     "paulmck@...nel.org" <paulmck@...nel.org>
CC:     Joel Fernandes <joel@...lfernandes.org>,
        Uladzislau Rezki <urezki@...il.com>,
        "josh@...htriplett.org" <josh@...htriplett.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RCU: Question on force_qs_rnp

Hello Paul

I have some questions for you .
in force_qs_rnp func ,  if  "f(rdp)" func return true we will call rcu_report_qs_rnp func
report a quiescent state for this rnp node, and clear grpmask form rnp->qsmask.
after that ,  can we make a check for this rnp->qsmask,  if  rnp->qsmask == 0, 
we will check blocked readers in this rnp node,  instead of jumping directly to the next node .

Thanks
Qiang