linux-kernel - Re: [RFC PATCH 0/4] kstrdup optimization

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Message-id: <54AE61F6.808@samsung.com>
Date:	Thu, 08 Jan 2015 11:54:46 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	Andi Kleen <andi@...stfloor.org>, Andreas Mohr <andi@...as.de>
Cc:	linux-mm@...ck.org, Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] kstrdup optimization

Hi Andi, Andreas,

Thanks for comments.

On 12/30/2014 10:29 PM, Andi Kleen wrote:
>> This symmetry issue probably could be cleanly avoided only
>> by having kfree() itself contain such an identifying check, as you suggest
>> (thereby slowing down kfree() performance).
> 
> It actually shouldn't slow it down. kfree already complains if you free
> a non slab page, this could be just in front of the error check.
> 
> The bigger concern is that it may hide some programing errors elsewhere
> though. So it's probably better to keep it a separate function.

Shall I interpret it as preliminary ack?

If yes, I can repost it without RFC prefix. Anyway I need to:
- add EXPORT_SYMBOL(kstrdup_const),
- add kerneldocs for both functions.

I can also add patch constifying mnt->mnt_devname in alloc_vfsmnt,
on my test platform it could save 13 additional allocations.

Regards
Andrzej


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