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Date: Mon, 18 Sep 2017 11:11:05 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Neeraj Upadhyay <neeraju@...eaurora.org> Cc: paulmck@...ux.vnet.ibm.com, josh@...htriplett.org, mathieu.desnoyers@...icios.com, jiangshanlai@...il.com, linux-kernel@...r.kernel.org, sramana@...eaurora.org, prsood@...eaurora.org, pkondeti@...eaurora.org, markivx@...eaurora.org, peterz@...radead.org Subject: Re: Query regarding synchronize_sched_expedited and resched_cpu On Sun, 17 Sep 2017 11:37:06 +0530 Neeraj Upadhyay <neeraju@...eaurora.org> wrote: > Hi Paul, how about replacing raw_spin_trylock_irqsave with > raw_spin_lock_irqsave in resched_cpu()? Are there any paths > in RCU code, which depend on trylock check/spinlock recursion? It looks to me that resched_cpu() was added for nohz full sched balancing, but is not longer used by that. The only user is currently RCU. Perhaps we should change that from a trylock to a lock. -- Steve
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