netdev - Re: Bisected softirq accounting issue in v4.11-rc1~170^2~28

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Message-ID: <20170328130602.GA4216@lerouge>
Date:   Tue, 28 Mar 2017 15:06:04 +0200
From:   Frederic Weisbecker <fweisbec@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Wanpeng Li <kernellwp@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tariq Toukan <tariqt@...lanox.com>,
        Tariq Toukan <ttoukan.linux@...il.com>,
        Rik van Riel <riel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: Bisected softirq accounting issue in v4.11-rc1~170^2~28

On Tue, Mar 28, 2017 at 02:26:42PM +0200, Peter Zijlstra wrote:
> On Tue, Mar 28, 2017 at 06:34:52PM +0800, Wanpeng Li wrote:
> > 
> > sched_clock_cpu(cpu) should be converted from cputime to ns.
> 
> Uhm, no. sched_clock_cpu() returns u64 in ns.

Yes, and most of the cputime_t have been converted to u64 so there
should be no such conversion issue between u64 and cputime_t anymore.

Perhaps my commit has another side effect on softirq time accounting,
I'll see if I can reproduce.