linux-kernel - Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP

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Message-ID: <alpine.DEB.2.00.1007160158540.18388@chino.kir.corp.google.com>
Date:	Fri, 16 Jul 2010 02:02:37 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Pekka Enberg <penberg@...helsinki.fi>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Christoph Lameter <cl@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>
Subject: Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR

On Fri, 16 Jul 2010, Pekka Enberg wrote:

> > I'd also consider patch 7 for 2.6.35-rc6 (and -stable).
> 
> It's an obvious bug fix but is it triggered in practice? Is there a bugzilla
> report for that?
> 

Let's ask Benjamin who initially reported the problem with arch_initcall 
whether or not this is rc (and stable) material.

For reference, we're talking about the sysfs_slab_remove() check on 
slab_state to prevent the WARN in the kobject code you hit with its fix 
below:


From: Christoph Lameter <cl@...ux-foundation.org>

slub: Allow removal of slab caches during boot

If a slab cache is removed before we have setup sysfs then simply skip over
the sysfs handling.

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Roland Dreier <rdreier@...co.com>
Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>

---
 mm/slub.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2010-07-06 15:13:48.000000000 -0500
+++ linux-2.6/mm/slub.c	2010-07-06 15:15:27.000000000 -0500
@@ -4507,6 +4507,13 @@ static int sysfs_slab_add(struct kmem_ca
 
 static void sysfs_slab_remove(struct kmem_cache *s)
 {
+	if (slab_state < SYSFS)
+		/*
+		 * Sysfs has not been setup yet so no need to remove the
+		 * cache from sysfs.
+		 */
+		return;
+
 	kobject_uevent(&s->kobj, KOBJ_REMOVE);
 	kobject_del(&s->kobj);
 	kobject_put(&s->kobj);
--
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