Re: [PATCH] net: use __GFP_NORETRY for high order allocations

From: David Rientjes
Date: Thu Feb 06 2014 - 16:39:13 EST

On Thu, 6 Feb 2014, Joe Perches wrote:

> > If they absolutely require local memory to
> > currnet's cpu node then that would make sense,
> I presumed THISNODE would be used only with NORETRY

Unfortunately, that would avoid attempting to defragment or reclaim
remotely for the order-3 allocation and only allocate remotely for

So we have to make a decision here what is more important: allocating
high-order memory or local memory to current's cpu at this given time?

The policy of transparent hugepages, for example, is always to allocate
order-9 memory remotely instead of falling back to allocating a smallpage

The original code never cared about local vs remote memory, so I don't
think there's any restriction to allocating remotely. I also don't know
many allocators that do __GFP_THISNODE and care about local memory to
current's cpu at this point in time, usually users of that flag are
allocating memory that must be local to a specific node (for things like
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