linux-kernel - Re: [RFC v2] genalloc:add an gen_pool_first_fit

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Date:	Wed, 29 Jul 2015 11:19:21 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Zhao Qiang-B45475 <qiang.zhao@...escale.com>
CC:	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"olof@...om.net" <olof@...om.net>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"Xie Xiaobo-R63061" <X.Xie@...escale.com>
Subject: Re: [RFC v2] genalloc:add an gen_pool_first_fit_align algo to
 genalloc

On Tue, 2015-07-28 at 00:32 -0500, Zhao Qiang-B45475 wrote:
> On Tue, 2015-07-28 at 5:21, Scott Wood wrote:
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: Tuesday, July 28, 2015 5:21 AM
> > To: Zhao Qiang-B45475
> > Cc: lauraa@...eaurora.org; linux-kernel@...r.kernel.org; linuxppc-
> > dev@...ts.ozlabs.org; akpm@...ux-foundation.org; olof@...om.net;
> > catalin.marinas@....com; Xie Xiaobo-R63061
> > Subject: Re: [RFC v2] genalloc:add an gen_pool_first_fit_align algo to
> > genalloc
> > 
> > On Mon, 2015-07-27 at 17:57 +0800, Zhao Qiang wrote:
> > 
> > Where's the part that adds the ability to pass in data to each allocation
> > call, as per the previous discussion?
> 
> You means to use gen_pool_alloc_data()?

Yes.

> Previously you said that the format of data is algorithm-specific,
> So I think it is better to handle data in algorithm function.

It is a channel for communication from the API caller to the algorithm.

> If you still prefer gen_pool_alloc_data(), I will modify it.
> But there still are details I want to confirm with you.
> 1. If use gen_pool_alloc_data(), should I pass data as a parameter?

Yes.

> 2. Should I count align_mask in gen_pool_alloc_data(), meanwhile, add 
>    a align_mask to data as a member?

gen_pool_alloc_data() should just pass data to the algorithm.  The algorithm 
should calculate align_mask based on align.  I don't think exposing 
align_mask to API users would be very friendly.

> 3. where to define the data, in genalloc.h or caller layer?

Same place as where the algorithm function is declared.

-Scott


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