linux-kernel - Re: [PATCH v15 04/13] task_isolation: add initial support

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Message-ID: <20160830075949.GA10153@twins.programming.kicks-ass.net>
Date:   Tue, 30 Aug 2016 09:59:49 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Chris Metcalf <cmetcalf@...lanox.com>
Cc:     Gilad Ben Yossef <giladb@...lanox.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Rik van Riel <riel@...hat.com>, Tejun Heo <tj@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Christoph Lameter <cl@...ux.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Lutomirski <luto@...capital.net>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v15 04/13] task_isolation: add initial support

On Mon, Aug 29, 2016 at 12:53:30PM -0400, Chris Metcalf wrote:

> Would it be cleaner to just replace the set_tsk_need_resched() call
> with something like:
> 
>     set_current_state(TASK_INTERRUPTIBLE);
>     schedule();
>     __set_current_state(TASK_RUNNING);
> 
> or what would you recommend?

That'll just get you to sleep _forever_...

> Or, as I said, just doing a busy loop here while testing to see
> if need_resched or signal had been set?

Why do you care about need_resched() and or signals? How is that related
to the tick being stopped or not?