On Wed, Mar 31, 2010 at 10:36 AM, Bob Liu <lliubbo@xxxxxxxxx> wrote: > On 3/31/10, Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> wrote: >> On Tue, 30 Mar 2010, Minchan Kim wrote: >> >>> Hi, Bob >>> >>> On Mon, Mar 29, 2010 at 11:57 PM, Bob Liu <lliubbo@xxxxxxxxx> wrote: >>> > In current do_migrate_pages(),if from_nodes and to_nodes have some >>> > intersect nodes,pages in these intersect nodes will also be >>> > migrated. >>> > eg. Assume that, from_nodes: 1,2,3,4 to_nodes: 2,3,4,5. Then these >>> > migrates will happen: >>> > migrate_pages(4,5); >>> > migrate_pages(3,4); >>> > migrate_pages(2,3); >>> > migrate_pages(1,2); >>> > >>> > But the user just want all pages in from_nodes move to to_nodes, >>> > only migrate(1,2)(ignore the intersect nodes.) can satisfied >>> > the user's request. >>> > >>> > I amn't sure what's migrate_page's semantic. >>> > Hoping for your suggestions. >>> >>> I didn't see 8:migratepages Lee pointed at that time. >>> The description matches current migrate_pages's behavior exactly. >>> >>> I agree Lee's opinion. >>> Let's wait Christoph's reply what is semantic >>> and why it doesn't have man page. >> >> Manpage is part of numatools. >> >> The intended semantic is the preservation of the relative position of the >> page to the beginning of the node set. If you do not want to preserve the >> relative position then just move portions of the nodes around. >> > > Hmm., > Sorry I still haven't understand your mention :-) > > My concern was why move the pages in the intersect nodes.I think skipping > this migration we can also satisfy the user's request. > In the above semantic, I haven't got the result. > man page said. "For example if we move from nodes 2-5 to 7,9,12-13 then the preferred mode of operation is to move pages from 2->7, 3->9, 4->12 and 5->13. However, this is only posssible if enough memory is available." If user uses migratepages((1,2,3,4), (2,3,4,5)), He want to move pages (1->2), (2-3), (3->4), (4-5). It matches with magpage. But with your suggestion, only (1-2). I think It doesn't match with man page. Do you want to add some words to make manpage more clear? > Thanks! > -- > Regards, > -Bob > -- Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href