Re: [RFC][PATCH 0/4] VM deadlock prevention -v4

From: Evgeniy Polyakov
Date: Mon Aug 14 2006 - 01:18:47 EST

On Sun, Aug 13, 2006 at 05:42:47PM -0700, Daniel Phillips (phillips@xxxxxxxxxx) wrote:
> High order allocations are just way too undependable without active
> defragmentation, which isn't even on the horizon at the moment. We
> just need to treat any network hardware that can't scatter/gather into
> single pages as too broken to use for network block io.

A bit of network tree allocator free advertisement - per-CPU self
defragmentation works reliably in that allocator, one could even find a
graphs of memory usage for NTA and SLAB-like allocator.

> As for sk_buff cow break, we need to look at which network paths do it
> (netfilter obviously, probably others) and decide whether we just want
> to declare that the feature breaks network block IO, or fix the feature
> so it plays well with reserve accounting.

I would suggest to consider skb cow (cloning) as a must.

> Regards,
> Daniel

Evgeniy Polyakov
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