linux-kernel - Re: [bisected] pre-3.16 regression on open() scalability

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Message-ID: <20140618022731.GM8178@tassilo.jf.intel.com>
Date:	Tue, 17 Jun 2014 19:27:31 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	Christoph Lameter <cl@...ux.com>, peterz@...radead.org
Subject: Re: [bisected] pre-3.16 regression on open() scalability

> OK.  What would you suggest instead?  If all we do is to revert the

Hang checker should have two timer phases:

Timer fires first time:
- Save context switch counter on that. Force a reschedule to some
work queue. Rearm timer

Timer fires again:
- Check reschedule count. If the reschedule count changed
it was a real hang, otherwise ignore.

-Andi
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