linux-kernel - Re: [PATCH 1/2] kfifo: round up the fifo size power of 2

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Message-ID: <20121026140607.GB1324@yliu-dev.sh.intel.com>
Date:	Fri, 26 Oct 2012 22:06:07 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Stefani Seibold <stefani@...bold.net>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] kfifo: round up the fifo size power of 2

On Fri, Oct 26, 2012 at 03:39:46PM +0200, Stefani Seibold wrote:
> Am Freitag, den 26.10.2012, 20:33 +0800 schrieb Yuanhan Liu:
> > On Fri, Oct 26, 2012 at 11:30:27AM +0200, Stefani Seibold wrote:
> > > Am Freitag, den 26.10.2012, 15:56 +0800 schrieb Yuanhan Liu:
> > > > Say, if we want to allocate a filo with size of 6 bytes, it would be safer
> > > > to allocate 8 bytes instead of 4 bytes.
> > > > ----
> > > > I know it works with rounddown_pow_of_two as well, since size is maintained
> > > > in the kfifo internal part. But, I'm quite curious why Stefani chose
> > > > rounddown_pow_of_two. To reduce memory?
> > > > 
> > > 
> > > Yes, exactly, if a user do the wrong thing, than the user will get also
> > > a wrong result, and did not waste memory.
> > 
> > But, isn't it better to 'correct' it? ;-)
> 
> Both is wrong. This depends on the view. For me it is better to get less
> and don't wast space. For example: requesting 1025 will yield in your
> case to a fifo which 2048 elements, which requires double of the memory
> as expected.
> 
> > 
> > > 
> > > But anyway, if the majority like this patch it is okay for me.
> > 
> > Sorry, do you mean you are OK with this patch?
> > 
> 
> I depends not on me, ask for a democratic decisions.

Since you are the original athour, your comments matter :D

Thanks,
Yuanhan Liu

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