From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 21 Nov 2006 13:31:24 +0000 (GMT) From: Hugh Dickins Subject: Re: build error: sparsemem + SLOB In-Reply-To: Message-ID: References: <20061119210545.9708e366.randy.dunlap@oracle.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: Randy Dunlap , linux-mm@kvack.org, mpm@selenic.com, Pekka Enberg List-ID: On Mon, 20 Nov 2006, Christoph Lameter wrote: > On Mon, 20 Nov 2006, Hugh Dickins wrote: > > > Lucky so far. Well, we'd actually have to be quite unlucky to ever > > see what page_lock_anon_vma/SLAB_DESTROY_BY_RCU are guarding against. > > Hmmm... I had to repeatedly fix my new slab code when I broke > DESTROY_BY_RCU. The machine wont even boot if that is not done right. I'm intrigued, and a little worried: won't even boot! Do you have some particular SGI monster in mind when you say "The machine"? Why was such a narrow (preemption disabled) window in page_lock_anon_vma so vulnerable? Swamped with many or slow-to-handle interrupts? Or was your slab code grossly over-eager in trying to free pages? Hugh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org