From: Venkatesh Pallipadi <venki@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
Aaron Durbin <adurbin@google.com>, Paul Turner <pjt@google.com>,
Yong Zhang <yong.zhang0@gmail.com>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 0/4] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v2
Date: Fri, 24 Feb 2012 14:33:16 -0800 [thread overview]
Message-ID: <1330122800-834-1-git-send-email-venki@google.com> (raw)
Addressed various comments to the previous version. I did have to avoid
x86 smpboot cleanup that Ingo suggested as that did not seem trivial to me :-).
I also separated out the change that does percpu idle task caching. That
change does provide a measurable gain to the IPI sender overhead.
Previous versions
* RFC - https://lkml.org/lkml/2012/2/6/357
* v1 - https://lkml.org/lkml/2012/2/22/512
Changes since previous versions:
RFC to v1
Moved the changes into arch specific code as per PeterZ suggestion (Mostly)
Got rid of new per cpu state logic in favor of TIF flag bits
v1 to v2
Generic TS_POLLING cleanup
Really really no change to generic code (other than TS_POLLING cleanup)
Single bit in TIF flags. Had to get rid of micro optimization of avoiding
second IPI to a CPU when there is already one pending, in favor of keeping
code simple and faster in common case.
Add irq_enter irq_exit around pending interrupt handlers
Extended the optimization to cover C1 mwait() and poll_idle()
next reply other threads:[~2012-02-24 22:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-24 22:33 Venkatesh Pallipadi [this message]
2012-02-24 22:33 ` [PATCH 1/4] tile, ia64, x86: TS_POLLING cleanup Venkatesh Pallipadi
2012-02-24 22:33 ` [PATCH 2/4] x86: Mwait idle optimization to avoid CAL+RES IPIs -v2 Venkatesh Pallipadi
2012-02-24 22:33 ` [PATCH 3/4] x86: Extend IPIless wake to C1_mwait and poll_idle Venkatesh Pallipadi
2012-02-24 22:33 ` [PATCH 4/4] x86: Optimize try_ipiless_wakeup avoid idle task lookup Venkatesh Pallipadi
2012-02-27 7:32 ` [PATCH 0/4] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v2 Ingo Molnar
2012-02-27 18:21 ` Venki Pallipadi
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