linux-kernel - Re: [PATCH V3] sched/cpufreq: calculate util / cap in advance in map_util

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Message-ID: <20190129104053.GI28467@hirez.programming.kicks-ass.net>
Date:   Tue, 29 Jan 2019 11:40:53 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Chunyan Zhang <chunyan.zhang@...soc.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Vincent Wang <vincent.wang@...soc.com>,
        Quentin Perret <quentin.perret@....com>,
        linux-kernel@...r.kernel.org, Chunyan Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH V3] sched/cpufreq: calculate util / cap in advance in
 map_util_freq()

On Mon, Jan 28, 2019 at 02:27:21PM +0800, Chunyan Zhang wrote:
> From: "vincent.wang" <vincent.wang@...soc.com>
> 
> When a task that is in_iowait state is enqueued, cpufreq_update_util()
> will be invoked with SCHED_CPUFREQ_IOWAIT flag. In this case,the value
> of util and cap, which are parameters used in map_util_freq(), will be
> cpu frequency, instead of cpu util and capactiy.

Didn't I tell you to fix the IOWAIT case to not pass in such large
numbers?