On Apr 3, 2017, at 9:41 AM, Johannes Thumshirn <jthumshirn@xxxxxxx> wrote: > > On Mon, Apr 03, 2017 at 06:30:21AM -0700, Kyle Fortin wrote: >> iscsiadm session login can fail with the following error: >> >> iscsiadm: Could not login to [iface: default, target: iqn.1986-03.com... >> iscsiadm: initiator reported error (9 - internal error) >> >> When /etc/iscsi/iscsid.conf sets node.session.cmds_max = 4096, it results >> in 64K-sized kmallocs per session. A system under fragmented slab >> pressure may not have any 64K objects available and fail iscsiadm session >> login. Even though memory objects of a smaller size are available, the >> large order allocation ends up failing. >> >> The kernel will print a warning and dump_stack, like below: > > There is a series of patches in Andrew's mmotm tree, which introduces > a kvmalloc() function, that does exactly what you're looking for. > > Maybe you want to base your patch on top of it. > > -- > Johannes Thumshirn Storage > jthumshirn@xxxxxxx +49 911 74053 689 > SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg > GF: Felix Imendörffer, Jane Smithard, Graham Norton > HRB 21284 (AG Nürnberg) > Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850 Thanks Johannes. I’ll take a look. -- Kyle Fortin - Oracle Linux Engineering
