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SubjectRe: [PATCH 1/1] NBD: allow nbd to be used locally
Pavel Machek wrote:

>> This patch allows a Network Block Device to be mounted locally (nbd-client
>> to nbd-server over
>> It creates a kthread to avoid the deadlock described in NBD tools
>> documentation. So, if nbd-client hangs waiting for pages, the kblockd
>> thread can continue its work and free pages.
> What happens if your new kthread blocks on memory allocation?

Well, we expect that. The reason for the new thread is so that it hangs,
rather than kblockd hanging (which on a UP system brings all I/O to a
halt). As long as kblockd can continue making progress, we eventually
free up memory and then NBD can finish its requests, too.


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