From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@kernel.dk>, Avi Kivity <avi@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>, KVM <kvm@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
Xen Devel <xen-devel@lists.xensource.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking
Date: Tue, 06 Sep 2011 11:50:58 -0700 [thread overview]
Message-ID: <4E666B92.9010300@goop.org> (raw)
In-Reply-To: <20110906182758.GR5795@redhat.com>
On 09/06/2011 11:27 AM, Don Zickus wrote:
>> But on the other hand, I don't really care if you can say that this path
>> will never be called in a virtual machine.
> Does virtual machines support hot remove of cpus? Probably not
> considering bare-metal barely supports it.
The only reason you'd want to is to add/remove VCPUs as a mechanism of
resource control, so if you were removing a VCPU it wouldn't matter much
which one you choose. In other words, there's no reason you'd ever need
to remove the BSP in favour of one of the other CPUs.
Anyway, I'm not going to lose any sleep over this issue.
J
WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Don Zickus <dzickus@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Nick Piggin <npiggin@kernel.dk>, KVM <kvm@vger.kernel.org>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Peter Zijlstra <peterz@infradead.org>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>, Avi Kivity <avi@redhat.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
Linus Torvalds <torvalds@linux-foundation.org>,
Xen Devel <xen-devel@lists.xensource.com>
Subject: Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking
Date: Tue, 06 Sep 2011 11:50:58 -0700 [thread overview]
Message-ID: <4E666B92.9010300@goop.org> (raw)
In-Reply-To: <20110906182758.GR5795@redhat.com>
On 09/06/2011 11:27 AM, Don Zickus wrote:
>> But on the other hand, I don't really care if you can say that this path
>> will never be called in a virtual machine.
> Does virtual machines support hot remove of cpus? Probably not
> considering bare-metal barely supports it.
The only reason you'd want to is to add/remove VCPUs as a mechanism of
resource control, so if you were removing a VCPU it wouldn't matter much
which one you choose. In other words, there's no reason you'd ever need
to remove the BSP in favour of one of the other CPUs.
Anyway, I'm not going to lose any sleep over this issue.
J
next prev parent reply other threads:[~2011-09-06 18:51 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-02 0:54 [PATCH 00/13] [PATCH RFC] Paravirtualized ticketlocks Jeremy Fitzhardinge
2011-09-02 0:54 ` [PATCH 01/13] x86/spinlocks: replace pv spinlocks with pv ticketlocks Jeremy Fitzhardinge
2011-09-02 0:54 ` [PATCH 02/13] x86/ticketlock: collapse a layer of functions Jeremy Fitzhardinge
2011-09-02 0:54 ` Jeremy Fitzhardinge
2011-09-02 0:54 ` [PATCH 03/13] xen/pvticketlock: Xen implementation for PV ticket locks Jeremy Fitzhardinge
2011-09-02 0:54 ` Jeremy Fitzhardinge
2011-09-02 0:54 ` [PATCH 04/13] x86/pvticketlock: use callee-save for lock_spinning Jeremy Fitzhardinge
2011-09-02 0:54 ` [PATCH 05/13] x86/ticketlocks: when paravirtualizing ticket locks, increment by 2 Jeremy Fitzhardinge
2011-09-02 0:54 ` [PATCH 06/13] x86/ticketlock: add slowpath logic Jeremy Fitzhardinge
2011-09-02 18:46 ` Eric Northup
2011-09-02 19:32 ` Jeremy Fitzhardinge
2011-09-02 0:55 ` [PATCH 07/13] x86/ticketlocks: tidy up __ticket_unlock_kick() Jeremy Fitzhardinge
2011-09-02 0:55 ` [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking Jeremy Fitzhardinge
2011-09-02 14:47 ` Peter Zijlstra
2011-09-02 19:29 ` Jeremy Fitzhardinge
2011-09-02 19:29 ` Jeremy Fitzhardinge
2011-09-02 20:47 ` Peter Zijlstra
2011-09-02 20:47 ` Peter Zijlstra
2011-09-02 21:50 ` Jeremy Fitzhardinge
2011-09-02 22:37 ` Peter Zijlstra
2011-09-02 22:37 ` Peter Zijlstra
2011-09-02 23:14 ` Andi Kleen
2011-09-05 11:52 ` Stefano Stabellini
2011-09-05 12:05 ` Avi Kivity
2011-09-06 15:14 ` Don Zickus
2011-09-06 18:07 ` Jeremy Fitzhardinge
2011-09-06 18:27 ` Don Zickus
2011-09-06 18:50 ` Jeremy Fitzhardinge [this message]
2011-09-06 18:50 ` Jeremy Fitzhardinge
2011-09-07 4:13 ` Avi Kivity
2011-09-07 13:44 ` Don Zickus
2011-09-07 13:44 ` Don Zickus
2011-09-07 15:11 ` Avi Kivity
2011-09-07 15:11 ` Avi Kivity
2011-09-07 15:56 ` Don Zickus
2011-09-07 15:56 ` Don Zickus
2011-09-07 16:25 ` Avi Kivity
2011-09-07 16:52 ` Don Zickus
2011-09-07 17:09 ` Avi Kivity
2011-09-07 17:17 ` Jeremy Fitzhardinge
2011-09-07 17:41 ` Avi Kivity
2011-09-07 19:09 ` Jeremy Fitzhardinge
2011-09-08 7:51 ` Avi Kivity
2011-09-08 17:29 ` Jeremy Fitzhardinge
2011-09-08 17:29 ` Jeremy Fitzhardinge
2011-09-11 9:59 ` Avi Kivity
2011-09-11 9:59 ` Avi Kivity
2011-09-07 17:21 ` Don Zickus
2011-09-07 17:21 ` Don Zickus
2011-09-07 17:41 ` Avi Kivity
2011-09-13 18:40 ` Don Zickus
2011-09-13 19:03 ` Andi Kleen
2011-09-13 19:21 ` Don Zickus
2011-09-13 19:21 ` Don Zickus
2011-09-13 19:58 ` Andi Kleen
2011-09-13 20:53 ` Don Zickus
2011-09-13 21:04 ` Andi Kleen
2011-09-14 7:00 ` Avi Kivity
2011-09-14 12:49 ` Don Zickus
2011-09-14 12:49 ` Don Zickus
2011-09-14 14:49 ` Andi Kleen
2011-09-14 15:01 ` Avi Kivity
2011-09-14 17:28 ` Andi Kleen
2011-09-14 17:28 ` Andi Kleen
2011-09-14 19:26 ` Avi Kivity
2011-09-14 19:34 ` Andi Kleen
2011-09-14 19:34 ` Andi Kleen
2011-09-14 19:56 ` Avi Kivity
2011-09-13 19:27 ` Don Zickus
2011-09-02 0:55 ` [PATCH 09/13] x86/pvticketlocks: we only need to kick if there's waiters Jeremy Fitzhardinge
2011-09-02 0:55 ` [PATCH 10/13] xen/pvticket: allow interrupts to be enabled while blocking Jeremy Fitzhardinge
2011-09-02 14:48 ` Peter Zijlstra
2011-09-02 19:30 ` Jeremy Fitzhardinge
2011-09-02 0:55 ` [PATCH 11/13] x86/ticketlock: only do kick after doing unlock Jeremy Fitzhardinge
2011-09-02 14:49 ` Peter Zijlstra
2011-09-02 19:34 ` Jeremy Fitzhardinge
2011-09-02 19:34 ` Jeremy Fitzhardinge
2011-09-02 0:55 ` [PATCH 12/13] x86/pvticketlock: make sure unlock_kick pvop call is inlined Jeremy Fitzhardinge
2011-09-02 0:55 ` [PATCH 13/13] x86/pvticketlock: use __ticket_t for pvop args Jeremy Fitzhardinge
2011-09-02 11:22 ` [PATCH 00/13] [PATCH RFC] Paravirtualized ticketlocks Stefano Stabellini
2011-09-02 11:22 ` Stefano Stabellini
2011-09-06 19:33 ` Jeremy Fitzhardinge
2011-09-02 15:38 ` Linus Torvalds
2011-09-02 20:07 ` Jeremy Fitzhardinge
2011-09-02 20:27 ` Linus Torvalds
2011-09-02 21:42 ` Jeremy Fitzhardinge
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E666B92.9010300@goop.org \
--to=jeremy@goop.org \
--cc=andi@firstfloor.org \
--cc=avi@redhat.com \
--cc=dzickus@redhat.com \
--cc=hpa@zytor.com \
--cc=jeremy.fitzhardinge@citrix.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=mtosatti@redhat.com \
--cc=npiggin@kernel.dk \
--cc=peterz@infradead.org \
--cc=stefano.stabellini@eu.citrix.com \
--cc=torvalds@linux-foundation.org \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xensource.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.