tree ce7d44eae139ca6b5c03026e8b471727f0df1fc1
parent f5ee37bd31678d6cb2313631f203794b5c25e862
author Mike Christie <michaelc@cs.wisc.edu> 1413442219 -0500
committer Ilya Dryomov <idryomov@redhat.com> 1414663910 +0300

libceph: use memalloc flags for net IO

This patch has ceph's lib code use the memalloc flags.

If the VM layer needs to write data out to free up memory to handle new
allocation requests, the block layer must be able to make forward progress.
To handle that requirement we use structs like mempools to reserve memory for
objects like bios and requests.

The problem is when we send/receive block layer requests over the network
layer, net skb allocations can fail and the system can lock up.
To solve this, the memalloc related flags were added. NBD, iSCSI
and NFS uses these flags to tell the network/vm layer that it should
use memory reserves to fullfill allcation requests for structs like
skbs.

I am running ceph in a bunch of VMs in my laptop, so this patch was
not tested very harshly.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Reviewed-by: Ilya Dryomov <idryomov@redhat.com>