linux-kernel - Re: [RFC][PATCH] dm: Remove dm_bufio_cond

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Message-ID: <20160923122607.GK5008@twins.programming.kicks-ass.net>
Date:   Fri, 23 Sep 2016 14:26:07 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Galbraith <umgwanakikbuti@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Alasdair Kergon <agk@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        dm-devel@...hat.com, Joe Thornber <ejt@...hat.com>
Subject: Re: [RFC][PATCH] dm: Remove dm_bufio_cond_resched()

On Fri, Sep 23, 2016 at 02:17:10PM +0200, Mike Galbraith wrote:
> On Fri, 2016-09-23 at 10:00 +0200, Thomas Gleixner wrote:
> > On Fri, 23 Sep 2016, Peter Zijlstra wrote:
> 
> > > Is anybody still using PREEMPT_NONE? Most workloads also care about
> > > latency to some extend. Lots of code has explicit cond_resched() and
> > > doesn't worry.
> > 
> > Dunno. But I bet there are workloads which love it.
> 
> SUSE definitely uses it.  I had presumed that was enterprise standard.

Hmm, I thought most distros defaulted to PREEMPT_VOLUNTARY.