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Gmane
From: Peter Zijlstra <peterz <at> infradead.org>
Subject: [RFC][PATCH 0/7] locking: qspinlock
Newsgroups: gmane.linux.kernel
Date: Monday 10th March 2014 15:42:36 UTC (over 2 years ago)
Hi Waiman,

I promised you this series a number of days ago; sorry for the delay I've
been
somewhat unwell :/

That said, these few patches start with a (hopefully) simple and correct
form
of the queue spinlock, and then gradually build upon it, explaining each
optimization as we go.

Having these optimizations as separate patches helps twofold; firstly it
makes
one aware of which exact optimizations were done, and secondly it allows
one to
proove or disprove any one step; seeing how they should be mostly identity
transforms.

The resulting code is near to what you posted I think; however it has one
atomic op less in the pending wait-acquire case for NR_CPUS != huge. It
also
doesn't do lock stealing; its still perfectly fair afaict.

Have I missed any tricks from your code?

The patches apply to tip/master +
[email protected]

I've yet to look at the paravirt stuff.
 
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