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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>, Peter Anvin <hpa@zytor.com>,
	Borislav Petkov <borislav.petkov@amd.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Mike Travis <travis@sgi.com>,
	Daniel J Blueman <daniel@numascale.com>
Subject: Re: [patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster
Date: Wed, 4 Nov 2015 22:46:01 -0800	[thread overview]
Message-ID: <CA+55aFzGFmGzytS_kDfs8FF=zZ2Y2sXpMNbY+g6EgVfwWEyaBw@mail.gmail.com> (raw)
In-Reply-To: <20151105063813.GA12730@gmail.com>

On Wed, Nov 4, 2015 at 10:38 PM, Ingo Molnar <mingo@kernel.org> wrote:
>
> but in the above sequence I think we can do even better: we don't need the
> local_irq_save()/restore() I think.

Right. Thomas added that one to my patch.

I don't think he realized just *how* trivial sending a single IPI is
with the x2apic, and just how horribly nasty the mask case is in
comparison (and how nasty it is that we historically turn a the single
ipi into a mask).

              Linus

  reply	other threads:[~2015-11-05  6:46 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-04 22:56 [patch 00/14] x86/apic: Implement single target IPI callback Thomas Gleixner
2015-11-04 22:57 ` [patch 01/14] x86/apic: Add a single-target IPI function to the apic Thomas Gleixner
2015-11-05 14:42   ` [tip:x86/apic] " tip-bot for Linus Torvalds
2015-11-04 22:57 ` [patch 02/14] x86/apic: Implement single target IPI function for x2apic_cluster Thomas Gleixner
2015-11-05  6:38   ` Ingo Molnar
2015-11-05  6:46     ` Linus Torvalds [this message]
2015-11-05  8:04       ` Thomas Gleixner
2015-11-05 14:43   ` [tip:x86/apic] " tip-bot for Linus Torvalds
2015-11-04 22:57 ` [patch 03/14] x86/apic: Implement default single target IPI function Thomas Gleixner
2015-11-05 14:43   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 04/14] x86/apic: Remove pointless indirections from apic_physflat Thomas Gleixner
2015-11-05 14:43   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 05/14] x86/apic: Wire up single IPI for apic_physflat Thomas Gleixner
2015-11-05 14:44   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 06/14] x86/apic: Remove pointless indirections from bigsmp_apic Thomas Gleixner
2015-11-05 14:44   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 07/14] x86/apic: Wire up single IPI for bigsmp_apic Thomas Gleixner
2015-11-05 14:44   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 08/14] x86/apic: Implement single IPI for x2apic_phys Thomas Gleixner
2015-11-05 14:45   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 09/14] x86/apic: Wire up single IPI for x2apic_uv Thomas Gleixner
2015-11-05 14:45   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 10/14] x86/apic: Implement single IPI for apic_noop Thomas Gleixner
2015-11-05 14:46   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 11/14] x86/apic: Wire up single IPI for apic_numachip Thomas Gleixner
2015-11-05 14:45   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 12/14] x86/apic: Provide default send single IPI wrapper Thomas Gleixner
2015-11-05 14:46   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 13/14] x86/apic: Use " Thomas Gleixner
2015-11-05 14:46   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:57 ` [patch 14/14] x86/smp: Remove " Thomas Gleixner
2015-11-05 14:47   ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2015-11-04 22:59 ` [patch 00/14] x86/apic: Implement single target IPI callback Linus Torvalds
2015-11-05  8:17   ` Thomas Gleixner

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