From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Date: Fri, 20 Mar 2015 19:54:09 +0000 Subject: Re: 4.0.0-rc4: panic in free_block Message-Id: <550C7AE1.1000808@oracle.com> List-Id: References: <550C5078.8040402@oracle.com> <550C6151.8070803@oracle.com> <20150320.154700.1250039074828760104.davem@davemloft.net> In-Reply-To: <20150320.154700.1250039074828760104.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: David Miller Cc: torvalds@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org On 3/20/15 1:47 PM, David Miller wrote: > From: David Ahern > Date: Fri, 20 Mar 2015 12:05:05 -0600 > >> DaveM: do you mind if I submit a patch to change the default for sparc >> to SLUB? > > I think we're jumping the gun about all of this, and doing anything > with default Kconfig settings would be entirely premature until we > know what the real bug is. The suggestion to change to SLUB as the default was based on Linus' comment "SLAB is probably also almost unheard of in high-CPU configurations, since slub has all the magical unlocked lists etc for scalability." > > On my T4-2 I've used nothing but SLAB and haven't hit any of these > problems. I can't even remember the last time I turned SLUB on, > and it's just because I'm lazy. > Interesting. With -j <64 and talking softly it completes. But -j 128 and higher always ends in a panic.