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Message-ID: <20140306133211.GA2220@gmail.com> Date: Thu, 6 Mar 2014 14:32:11 +0100 From: Ingo Molnar <mingo@...nel.org> To: Igor Mammedov <imammedo@...hat.com> Cc: linux-kernel@...r.kernel.org, drjones@...hat.com, toshi.kani@...com, prarit@...hat.com, kirill.shutemov@...ux.intel.com, JBeulich@...e.com, peterz@...radead.org, paul.gortmaker@...driver.com, seiji.aguchi@....com, bp@...e.de, hpa@...or.com, mingo@...hat.com, x86@...nel.org, tglx@...utronix.de, riel@...hat.com Subject: Re: [PATCH] abort secondary CPU bring-up gracefully if do_boot_cpu timed out on cpu_callin_mask * Igor Mammedov <imammedo@...hat.com> wrote: > On Thu, 6 Mar 2014 08:08:32 +0100 > Ingo Molnar <mingo@...nel.org> wrote: > > > > > * Igor Mammedov <imammedo@...hat.com> wrote: > > > > > Master CPU may timeout before cpu_callin_mask is set and cancel > > > booting CPU, but being onlined CPU still continues to boot, sets > > > cpu_active_mask (CPU_STARTING notifiers) and spins in > > > check_tsc_sync_target() for master cpu to arrive. Following attempt > > > to online another cpu hangs in stop_machine, initiated from here: > > > > The changelog needs to prominently contain a description of the > > practical relevance of this patch: has the hang triggered on any > > system and under what circumstances, and did the patch resolve the > > hang, etc.? > > Hang is observed on virtual machines during CPU hotplug, especially > in big guests with many CPUs. (It happens more often if host is > over-committed). > > Similar patch is carried in RHEL6 since 2012 and it fixes issue > there, when applied to upstream kernel it also fixes issue. Okay, cool - please update the patch description with that and resubmit. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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