From: "Luck, Tony" <tony.luck@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Harry Junior <harryjr@outlook.fr>,
x86@kernel.org, Peter Zijlstra <peterz@infradead.org>,
Joe Lawrence <joe.lawrence@stratus.com>,
Borislav Petkov <bp@alien8.de>,
Ben Hutchings <ben@decadent.org.uk>
Subject: Re: [PATCH V2] x86/irq: Cure live lock in fixup_irqs()
Date: Thu, 17 Mar 2016 14:14:40 -0700 [thread overview]
Message-ID: <20160317211439.GA21968@intel.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1603140931430.3657@nanos>
This version also passes repeated iterations of:
# echo 0 | tee /sys/devices/system/cpu/cpu*/online
# echo 1 | tee /sys/devices/system/cpu/cpu*/online
Some of the time taken in the offline cycle may be
a more than O(N) chasing of IRQs onto an ever smaller
available set of online cpus. There are over 4000
lines like this:
[ 218.220045] Broke affinity for irq 66
on the console for each offline pass.
Also a couple of these:
[ 221.951171] IRQ fixup: irq 68 move in progress, old vector 79
for each pass offlining all but one cpu.
Tested-by: Tony Luck <tony.luck@intel.com>
-Tony
next prev parent reply other threads:[~2016-03-17 21:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-14 8:40 [PATCH V2] x86/irq: Cure live lock in fixup_irqs() Thomas Gleixner
2016-03-17 21:14 ` Luck, Tony [this message]
2016-03-18 13:55 ` [tip:x86/urgent] " tip-bot for Thomas Gleixner
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