On Sun, 2006-08-13 at 21:58 -0700, Andrew Morton wrote:

On Mon, 14 Aug 2006 06:40:53 +0200
Peter Zijlstra [off-list ref] wrote:

quoted

Testcase:

Mount an NBD device as sole swap device and mmap > physical RAM, then
loop through touching pages only once.

Fix: don't try to swap over the network.  Yes, there may be some scenarios
where people have no local storage, but it's reasonable to expect anyone
who is using Linux as an "enterprise storage platform" to stick a local
disk on the thing for swap.

I wish you were right, however there seems to be a large demand to go
diskless and swap over iSCSI because disks seem to be the nr. 1 failing
piece of hardware in systems these days.

That leaves MAP_SHARED, but mm-tracking-shared-dirty-pages.patch will fix
that, will it not?

Will makes it less likely. One can still have memory pressure, the
remaining bits of memory can still get stuck in socket queues for
blocked processes.

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