From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-x235.google.com (mail-pa0-x235.google.com [IPv6:2607:f8b0:400e:c03::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 068751A0035 for ; Thu, 25 Feb 2016 16:43:09 +1100 (AEDT) Received: by mail-pa0-x235.google.com with SMTP id fy10so26002493pac.1 for ; Wed, 24 Feb 2016 21:43:09 -0800 (PST) Date: Wed, 24 Feb 2016 21:43:06 -0800 (PST) From: Hugh Dickins To: "Aneesh Kumar K.V" cc: Hugh Dickins , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org Subject: Re: Problems with swapping in v4.5-rc on POWER In-Reply-To: <877fhttmr1.fsf@linux.vnet.ibm.com> Message-ID: References: <877fhttmr1.fsf@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 25 Feb 2016, Aneesh Kumar K.V wrote: > > Can you test the impact of the merge listed below ?(ie, revert the merge and see if > we can reproduce and also verify with merge applied). This will give us a > set of commits to look closer. We had quiet a lot of page table > related changes going in this merge window. > > f689b742f217b2ffe7 ("Pull powerpc updates from Michael Ellerman:") > > That is the merge commit that added _PAGE_PTE. Another experiment running on it at the moment, I'd like to give that a few more hours, and then will try the revert you suggest. But does that merge revert cleanly, did you try? I'm afraid of interactions, whether obvious or subtle, with the THP refcounting rework. Oh, since I don't have THP configured on, maybe I can ignore any issues from that. Hugh