On 09/02/2011 11:46 AM, Eric Northup wrote:
> On Thu, Sep 1, 2011 at 5:54 PM, Jeremy Fitzhardinge <[email protected]> wrote:
>> From: Jeremy Fitzhardinge <[email protected]>
>>
>> Maintain a flag in both LSBs of the ticket lock which indicates whether
>> anyone is in the lock slowpath and may need kicking when the current
>> holder unlocks. The flags are set when the first locker enters
>> the slowpath, and cleared when unlocking to an empty queue.
> Are there actually two flags maintained? I only see the one in the
> ticket tail getting set/cleared/tested.
Yeah, there's only one flag, so there's a spare bit in the other half.
j
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