Re: [PATCH] Deadlock during heavy write activity to userspace NFS

Ulrich Weigand
2004-07-28T02:32:08Z

Avi Kivity wrote:

>In our case, all block I/O is done using
>unbuffered I/O, and all memory is preallocated, so we don't need kswapd
>at all, just that small bit of memory that syscalls consume.

Does your userspace process need to send/receive network packets
in order to perform a write-out? If so, how can you make sure your
incoming packets aren't thrown away in out-of-memory situations?
(Outgoing packets can use PF_MEMALLOC memory I guess, but incoming
ones aren't associated to any process yet ...)

Bye,
Ulrich

--
Dr. Ulrich Weigand
weigand@informatik.uni-erlangen.de