From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by ug-out-1314.google.com with SMTP id s2so3879614uge for ; Wed, 27 Dec 2006 19:49:37 -0800 (PST) Message-ID: <6d6a94c50612271949l66265cd4v4c63c1bdf3984417@mail.gmail.com> Date: Thu, 28 Dec 2006 11:49:37 +0800 From: Aubrey Subject: Re: Page alignment issue In-Reply-To: <6d6a94c50612270749j77cd53a9mba6280e4129d9d5a@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <6d6a94c50612270749j77cd53a9mba6280e4129d9d5a@mail.gmail.com> Sender: owner-linux-mm@kvack.org Return-Path: To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Nick Piggin List-ID: On 12/27/06, Aubrey wrote: > As for the buddy system, much of docs mention the physical address of > the first page frame of a block should be a multiple of the group > size. For example, the initial address of a 16-page-frame block should > be 16-page aligned. I happened to encounted an issue that the physical > addresss pf the block is not 4-page aligned(0x36c9000) while the order > of the block is 2. I want to know what out of buddy algorithm depend > on this feature? My problem seems to happen in > schedule()->context_switch() call, but so far I didn't figure out the > root cause. It seems nothing depend on this feature. the problem you encounted is the kernel task stack should be 2-page aligned. -Aubrey -- 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