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SubjectRe: [PATCH 0/13] Parallel struct page initialisation v4
On Tue, May 05, 2015 at 03:25:49PM -0700, Andrew Morton wrote:
> On Tue, 5 May 2015 23:13:29 +0100 Mel Gorman <mgorman@suse.de> wrote:
>
> > > Alternatively, the page allocator can go off and synchronously
> > > initialize some pageframes itself. Keep doing that until the
> > > allocation attempt succeeds.
> > >
> >
> > That was rejected during review of earlier attempts at this feature on
> > the grounds that it impacted allocator fast paths.
>
> eh? Changes are only needed on the allocation-attempt-failed path,
> which is slow-path.

We'd have to distinguish between falling back to other zones because the
high zone is artifically exhausted and normal ALLOC_BATCH exhaustion. We'd
also have to avoid falling back to remote nodes prematurely. While I have
not tried an implementation, I expected they would need to be in the fast
paths unless I used jump labels to get around it. I'm going to try altering
when we initialise instead so that it happens earlier.

--
Mel Gorman
SUSE Labs


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