![]() | |||||||||||||
Messages in this thread |
On Tue, Oct 18, 2005 at 11:29:18AM +0900, Yasunori Goto wrote: > Hello. Linus-san. > ... > In our making IA64 machine node 0 might not have any low-memory, and > another node can have low-memory instead. > > This cause comes from hotplug whole of one node. > For example, please imagine following case. > > 1) In this case, firmware remembers pxm 1's node has low memory. > > node 0 node 1 > +--------------+ +-----------+ > | pxm = 1 | | pxm = 2 | > | low memory | | | > +--------------+ +-----------+ > > > 2) If one node is hot-added at pxm = 0 (pxm is decided from physical > locate by firmware.), new node will be node 2. > > node 2 node 0 node 1 > +-----------+ +--------------+ +-----------+ > | pxm = 0 | | pxm = 1 | | pxm = 2 | > | | | low memory | | | > +-----------+ +--------------+ +-----------+ > > 3) If user reboots the machine, Linux decides node id from pxm's order. > But firmware still remembers which node has low memory. > So, node 0 will not have any low memory. > > node 0 node 1 node 2 > +-----------+ +--------------+ +-----------+ > | pxm = 0 | | pxm = 1 | | pxm = 2 | > | | | low memory | | | > +-----------+ +--------------+ +-----------+ > > So, just "use NODE(0)" is not enough hack for our machine. > If "use NODE(0)" is selected, kernel must sort pgdat link and > node id by memory address. I think that hot add code will be a > bit messy instead. Yasunori-san, Does this patch work on your boxes instead? (For 2.6.14) http://marc.theaimsgroup.com/?l=linux-kernel&m=112959469914681&w=2 Thanks, Kiran - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2005-10-18 03:24 [W:0.875 / U:0.010 seconds] ©2003-2008 Jasper Spaans | |||||||||||||