linux-kernel - Re: [PATCH] [1/4] SLAB: Handle node-not-up case in fallback

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Message-ID: <20100215102221.GL5723@laptop>
Date:	Mon, 15 Feb 2010 21:22:21 +1100
From:	Nick Piggin <npiggin@...e.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	penberg@...helsinki.fi, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, haicheng.li@...el.com, rientjes@...gle.com
Subject: Re: [PATCH] [1/4] SLAB: Handle node-not-up case in
 fallback_alloc() v2

On Mon, Feb 15, 2010 at 11:07:12AM +0100, Andi Kleen wrote:
> > This is a better way to go anyway because it really is a proper
> > "fallback" alloc. I think that possibly used to work (ie. kmem_getpages
> > would be able to pass -1 for the node there) but got broken along the
> > line.
> 
> Thanks for the review.
> 
> I should add there's still one open problem: in some cases 
> the oom killer kicks in on hotadd. Still working on that one.
> 
> In general hotadd was mighty bitrotted :/

Yes, that doesn't surprise me. I'm sure you can handle it, but send
some traces if you have problems.

 
> > Although it's not such a hot path to begin with, care to put a branch
> > annotation there?
> 
> pointer == NULL is already default unlikely in gcc
> 
> /* Pointers are usually not NULL.  */
> DEF_PREDICTOR (PRED_POINTER, "pointer", HITRATE (85), 0)
> DEF_PREDICTOR (PRED_TREE_POINTER, "pointer (on trees)", HITRATE (85), 0)

Well I still prefer to annotate it. I think builtin expect is 99%.

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