linux-kernel - Re: [PATCH] kernel: timer: looping issue, need reset variable 'found'

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Message-ID: <51B93EFC.9060008@asianux.com>
Date:	Thu, 13 Jun 2013 11:39:40 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel: timer: looping issue, need reset variable 'found'


Sorry for replying late during these days, firstly.


On 06/10/2013 10:12 PM, Thomas Gleixner wrote:
> On Sun, 9 Jun 2013, Chen Gang wrote:
> 
>> > 
>> > According to __internal_add_timer(), in _next_timer_interrupt(), when
>> > 'tv1.vec' find one, but need 'cascade bucket(s)', we still need find
>> > each slot of 'tv*.vec'.
> No, we do not. We only need to scan the first cascade array after the
> enqueued timer. If there is nothing in tv2 which might come before the
> found timer, then any timer in tv3 will be later than the one we found
> in the primary wheel.
> 

OK, thanks, I should read details to confirm it (at least now, I still
not quite be sure about it).


>> > So need reset variable 'found', so can fully scan ''do {...} while()''
>> > for 'tv*.vec'.
> And thereby lose the information, that we already found a timer in the
> scan of the primary array.

Hmm..., I should read details.


And excuse me, I also have to do another things during these days, so
maybe reply late.


Thanks.
-- 
Chen Gang

Asianux Corporation
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