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Message-ID: <20150402190910.GF27490@worktop.programming.kicks-ass.net> Date: Thu, 2 Apr 2015 21:09:10 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Frederic Weisbecker <fweisbec@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Oleg Nesterov <oleg@...hat.com>, "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com> Subject: Re: [PATCH 2/3] context_tracking: Inherit TIF_NOHZ through forks instead of context switches On Thu, Apr 02, 2015 at 07:39:24PM +0200, Frederic Weisbecker wrote: > TIF_NOHZ is used by context_tracking to force syscall slow-path on every > task in order to track userspace roundtrips. As such, it must be set on > all running tasks. > > It's currently explicitly inherited through context switches. There is > no need to do it on this fast-path though. The flag could be simply > set once for all on all tasks, whether they are running or not. > > Lets do this by setting the flag to init task on early boot and let it > propagate through fork inheritance. > One must ask, what's the point of the flag if everybody must always have it set? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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