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Date: Sat, 12 Mar 2016 11:58:09 +0100 (CET) From: Thomas Gleixner <tglx@...utronix.de> To: "Luck, Tony" <tony.luck@...el.com> cc: LKML <linux-kernel@...r.kernel.org>, Harry Junior <harryjr@...look.fr>, x86@...nel.org, Peter Zijlstra <peterz@...radead.org>, Joe Lawrence <joe.lawrence@...atus.com>, Borislav Petkov <bp@...en8.de> Subject: Re: [PATCH] x86/irq: Cure live lock in irq_force_complete_move() On Fri, 11 Mar 2016, Luck, Tony wrote: > With this patch applied my system survives me doing > several rounds of: > > # echo 0 | tee /sys/devices/system/cpu/cpu*/online > # echo 1 | tee /sys/devices/system/cpu/cpu*/online > > whereas without the patch the first of those went to > > [152455.129604] NMI watchdog: Watchdog detected hard LOCKUP on cpu 96 > [152455.136943] Kernel panic - not syncing: Hard LOCKUP > > I'm not sure we care to optimize the cpu offline path, but I'll note here > that taking all (but one) cpus offline took 52 seconds (for a hundred > and mumble logical cpus). Bringing them all back is just 4 seconds. > > Tested-by: Tony Luck <tony.luck@...el.com> Unfortunately while it cures the livelock it's still not correct. /me goes back to the drawing board
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