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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: [patch V2 00/12] cpu/hotplug: SMT control
Date: Thu, 7 Jun 2018 11:30:54 -0400	[thread overview]
Message-ID: <20180607153054.GQ21334@char.us.oracle.com> (raw)
In-Reply-To: <20180606192714.754943543@linutronix.de>

On Wed, Jun 06, 2018 at 09:27:14PM +0200, speck for Thomas Gleixner wrote:
> The following series is a reworked version of the initial proof of concept
> patch. The main changes are:
> 
>   - The primary sibling evaluation has been changed to use APIC ID, so the
>     hacky stuff is gone.
> 
>   - The control has now 3 states: on, off, forceoff
> 
>     forceoff is a irreversible operation and if given on the command line
>     via 'nosmt=force' it makes the processor/APIC enumeration code discard
>     the non primary siblings. That affects also the number of possible CPUs
>     and is more or less equivalent to disabling SMT in the BIOS.
> 
>     If 'forceoff' is written to the sysfs file, then the non primamry
>     siblings are offlined as with 'off', but the operation cannot be
>     undone. That has obviously no effect on num_possible_cpus as that has
>     been evaluated in the early boot process.
> 
>   - Command line and sysfs interface are documented
> 
> Survived testing on various Intel and AMD machines and in VMs of different
> flavours and topology configurations.
> 
> Applies on top of Linus tree.

Any chance you could provide an git bundle for those lazy folks who like
to compile and test it out?

  parent reply	other threads:[~2018-06-07 15:31 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-06 19:27 [patch V2 00/12] cpu/hotplug: SMT control Thomas Gleixner
2018-06-06 19:27 ` [patch V2 01/12] sched/smt: Update sched_smt_present at runtime Thomas Gleixner
2018-06-11 18:35   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-15 13:17     ` Thomas Gleixner
2018-06-21 11:22     ` [MODERATED] " Peter Zijlstra
2018-06-06 19:27 ` [patch V2 02/12] x86/smp: Provide topology_is_primary_thread() Thomas Gleixner
2018-06-11 19:32   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-11 20:15     ` Konrad Rzeszutek Wilk
2018-06-12 10:27       ` Andrew Cooper
2018-06-12  8:05     ` Thomas Gleixner
2018-06-12 10:31       ` [MODERATED] " Andrew Cooper
2018-06-12 20:02         ` Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 03/12] cpu/hotplug: Make bringup/teardown of smp threads symmetric Thomas Gleixner
2018-06-11 20:55   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 04/12] cpu/hotplug: Split do_cpu_down() Thomas Gleixner
2018-06-11 20:56   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 05/12] cpu/hotplug: Provide knob to control SMT Thomas Gleixner
2018-06-11 21:22   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-20 20:00   ` Dave Hansen
2018-06-20 20:11     ` Thomas Gleixner
2018-06-20 20:25   ` [MODERATED] " Dave Hansen
2018-06-20 20:52     ` Thomas Gleixner
2018-06-06 19:27 ` [patch V2 06/12] x86/cpu: Remove the pointless CPU printout Thomas Gleixner
2018-06-11 21:23   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 07/12] x86/cpu/AMD: Remove the pointless detect_ht() call Thomas Gleixner
2018-06-11 21:24   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 08/12] x86/cpu/common: Provide detect_ht_early() Thomas Gleixner
2018-06-12 20:22   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 09/12] x86/cpu/topology: Provide detect_extended_topology_early() Thomas Gleixner
2018-06-12 20:33   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-06 19:27 ` [patch V2 10/12] x86/cpu/intel: Evaluate smp_num_siblings early Thomas Gleixner
2018-06-12 20:44   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-15 14:02     ` Thomas Gleixner
2018-06-06 19:27 ` [patch V2 11/12] x86/cpu/AMD: " Thomas Gleixner
2018-06-06 19:27 ` [patch V2 12/12] x86/apic: Ignore secondary threads if nosmt=force Thomas Gleixner
2018-06-06 19:59   ` [MODERATED] " Linus Torvalds
2018-06-06 21:50     ` Thomas Gleixner
2018-06-12 20:51   ` [MODERATED] " Konrad Rzeszutek Wilk
2018-06-15 14:11     ` Thomas Gleixner
2018-06-06 23:16 ` [MODERATED] Re: [patch V2 00/12] cpu/hotplug: SMT control Andi Kleen
2018-06-07  6:50   ` Thomas Gleixner
2018-06-07  7:42     ` [MODERATED] " Jiri Kosina
2018-06-07 20:36       ` Andi Kleen
2018-06-07 20:42     ` Andi Kleen
2018-06-07 15:30 ` Konrad Rzeszutek Wilk [this message]
2018-06-07 15:43   ` Thomas Gleixner
2018-06-08 17:51 ` [MODERATED] " Josh Poimboeuf
2018-06-11 19:40 ` Jiri Kosina

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