From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) by kanga.kvack.org (Postfix) with ESMTP id 561EB6B0158 for ; Tue, 26 May 2015 09:02:52 -0400 (EDT) Received: by padbw4 with SMTP id bw4so92431087pad.0 for ; Tue, 26 May 2015 06:02:52 -0700 (PDT) Received: from mail-pa0-x232.google.com (mail-pa0-x232.google.com. [2607:f8b0:400e:c03::232]) by mx.google.com with ESMTPS id pg6si20804077pbb.168.2015.05.26.06.02.51 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 May 2015 06:02:51 -0700 (PDT) Received: by pabru16 with SMTP id ru16so92458949pab.1 for ; Tue, 26 May 2015 06:02:51 -0700 (PDT) Subject: Re: [RFC PATCH 2/2] arm64: Implement vmalloc based thread_info allocator Mime-Version: 1.0 (Apple Message framework v1283) Content-Type: text/plain; charset=us-ascii From: Jungseok Lee In-Reply-To: Date: Tue, 26 May 2015 22:02:46 +0900 Content-Transfer-Encoding: quoted-printable Message-Id: References: <1432483340-23157-1-git-send-email-jungseoklee85@gmail.com> <5992243.NYDGjLH37z@wuerfel> Sender: owner-linux-mm@kvack.org List-ID: To: Catalin Marinas Cc: Arnd Bergmann , Catalin Marinas , "barami97@gmail.com" , Will Deacon , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-arm-kernel@lists.infradead.org" On May 26, 2015, at 1:47 AM, Catalin Marinas wrote: > On 25 May 2015, at 13:01, Jungseok Lee = wrote: >=20 >>> Could the stack size be reduced to 8KB perhaps? >>=20 >> I guess probably not. >>=20 >> A commit, 845ad05e, says that 8KB is not enough to cover SpecWeb = benchmark. >=20 > We could go back to 8KB stacks if we implement support for separate = IRQ=20 > stack on arm64. It's not too complicated, we would have to use SP0 for = (kernel) threads=20 > and SP1 for IRQ handlers. Definitely interesting. It looks like there are two options based on discussion. 1) Reduce the stack size with separate IRQ stack scheme 2) Figure out a generic anti-fragmentation solution Do I miss anything? I am still not sure about the first scheme as reviewing Minchan's = findings repeatedly, but I agree that the item should be worked actively. Best Regards Jungseok Lee= -- 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