linux-kernel - Re: [PATCH] sched/fair: Limit sched_cfs_period

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Message-ID: <20190315162911.GA5996@hirez.programming.kicks-ass.net>
Date:   Fri, 15 Mar 2019 17:29:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Phil Auld <pauld@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Ben Segall <bsegall@...gle.com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] sched/fair: Limit sched_cfs_period_timer loop to avoid
 hard lockup

On Fri, Mar 15, 2019 at 09:30:42AM -0400, Phil Auld wrote:
> On Fri, Mar 15, 2019 at 11:11:50AM +0100 Peter Zijlstra wrote:

> > Computers _suck_ at /100. And since you're free to pick the constant,
> > pick a power of two, computers love those.
> > 
> 
> Fair enough, I was thinking percents. And also that once we get in
> here it's not a really hot path.

I've seen people say that before; but that's not something I can relate
to. The basic idea is fractions.