Re: [PATCH 0/13] Parallel struct page initialisation v4

[Mel Gorman]

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@xxxxxxx> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/