linux-kernel - Re: vmstat: On demand vmstat workers V8

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Message-ID: <53D6C80F.8010307@oracle.com>
Date:	Mon, 28 Jul 2014 18:00:47 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...two.org>
CC:	Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, John Stultz <johnstul@...ibm.com>,
	Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
	viresh.kumar@...aro.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org
Subject: Re: vmstat: On demand vmstat workers V8

On 07/28/2014 05:54 PM, Andrew Morton wrote:
> Also, Sasha's report showed this:
> 
> [  490.464613] kernel BUG at mm/vmstat.c:1278!
> 
> That's your VM_BUG_ON() in vmstat_update().  That ain't no false
> positive!
> 
> 
> 
> Is this code expecting that schedule_delayed_work() will schedule the
> work on the current CPU?  I don't think it will do that.  Maybe you
> should be looking at schedule_delayed_work_on().

I suspected that the re-queue might be wrong (schedule_delayed_work vs
schedule_delayed_work_on) and tried fixing that, but that didn't solve
the issue.

I could give it another go unless someone sees the issue, I might have
messed something up.


Thanks,
Sasha
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