linux-kernel - Re: [PATCH v0] add nano semaphore in kernel

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Message-ID: <AANLkTinNhupY59gYJNi_za8UvgGkjFA9mbdkKfwfKWeQ@mail.gmail.com>
Date:	Sun, 26 Dec 2010 15:08:01 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v0] add nano semaphore in kernel

On Sun, Dec 26, 2010 at 1:04 PM, Hillf Danton <dhillf@...il.com> wrote:
> On Sun, Dec 26, 2010 at 2:46 PM, Rakib Mullick <rakib.mullick@...il.com> wrote:
>> On Sun, Dec 26, 2010 at 11:13 AM, Hillf Danton <dhillf@...il.com> wrote:
>> Above description tells how its done, what it is but its not clear why
>> we should use it. Can I know why should we use it or its benefits?
>>
>
> The outstanding benefit looks that nano semaphore could be used in
> cases where callers want to wait not only more than one jiffy, but far
> less than one jiffy also.
>
But, how do we know that resources are going to be available within
one jiffy or far less than one jiffy? We we be deterministic?

thanks,
rakib
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