linux-kernel - Re: [GIT PULL v2] Early SLAB fixes for 2.6.31

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Date:	Mon, 15 Jun 2009 13:21:44 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Nick Piggin <npiggin@...e.de>, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	cl@...ux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
	lizf@...fujitsu.com, mingo@...e.hu, yinghai@...nel.org,
	benh@...nel.crashing.org
Subject: Re: [GIT PULL v2] Early SLAB fixes for 2.6.31

On Mon, 2009-06-15 at 12:20 +0200, Heiko Carstens wrote:
> > > ---
> > >  mm/slub.c |   17 ++++++++++++++---
> > >  1 file changed, 14 insertions(+), 3 deletions(-)
> > > 
> > > Index: linux-2.6/mm/slub.c
> > > ===================================================================
> > > --- linux-2.6.orig/mm/slub.c
> > > +++ linux-2.6/mm/slub.c
> > > @@ -2596,6 +2596,7 @@ static noinline struct kmem_cache *dma_k
> > >  	struct kmem_cache *s;
> > >  	char *text;
> > >  	size_t realsize;
> > > +	unsigned long slabflags;
> > >  
> > >  	s = kmalloc_caches_dma[index];
> > >  	if (s)
> > > @@ -2617,9 +2618,18 @@ static noinline struct kmem_cache *dma_k
> > >  			 (unsigned int)realsize);
> > >  	s = kmalloc(kmem_size, flags & ~SLUB_DMA);
> > >  
> > > +	/*
> > > +	 * Must defer sysfs creation to a workqueue because we don't know
> > > +	 * what context we are called from. Before sysfs comes up, we don't
> > > +	 * need to do anything because slab_sysfs_init will start by
> > > +	 * adding all existing slabs to sysfs.
> > > +	 */
> > > +	slabflags = SLAB_CACHE_DMA;
> > > +	if (slab_state >= SYSFS)
> > > +		slabflags |= __SYSFS_ADD_DEFERRED;
> > > +
> > >  	if (!s || !text || !kmem_cache_open(s, flags, text,
> > > -			realsize, ARCH_KMALLOC_MINALIGN,
> > > -			SLAB_CACHE_DMA|__SYSFS_ADD_DEFERRED, NULL)) {
> > > +			realsize, ARCH_KMALLOC_MINALIGN, slabflags, NULL)) {
> > >  		kfree(s);
> > >  		kfree(text);
> > >  		goto unlock_out;
> > > @@ -2628,7 +2638,8 @@ static noinline struct kmem_cache *dma_k
> > >  	list_add(&s->list, &slab_caches);
> > >  	kmalloc_caches_dma[index] = s;
> > >  
> > > -	schedule_work(&sysfs_add_work);
> > > +	if (slab_state >= SYSFS)
> > > +		schedule_work(&sysfs_add_work);
> > >  
> > >  unlock_out:
> > >  	up_write(&slub_lock);
> > 
> > Looks good to me. Heiko, does it fix your case?
> 
> Yes, works fine. Thanks!
> 
> Tested-by: Heiko Carstens <heiko.carstens@...ibm.com>

Thanks! Nick, care to send a patch with your sign-off? Does SLQB need
something like this too (I didn't check)?

			Pekka

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