Re: [RFC][PATCH 0/6] Another go at speculative page faults

[Peter Zijlstra]

On Thu, Oct 23, 2014 at 06:40:05PM +0800, Lai Jiangshan wrote:
> On 10/22/2014 01:56 AM, Peter Zijlstra wrote:
> > On Tue, Oct 21, 2014 at 08:09:48PM +0300, Kirill A. Shutemov wrote:
> >> It would be interesting to see if the patchset affects non-condended case.
> >> Like a one-threaded workload.
> > 
> > It does, and not in a good way, I'll have to look at that... :/
> 
> Maybe it is blamed to find_vma_srcu() that it doesn't take the advantage of
> the vmacache_find() and cause more cache-misses.

Its what I thought initially, I tried doing perf record with and
without, but then I ran into perf diff not quite working for me and I've
yet to find time to kick that thing into shape.

> Is it hard to use the vmacache in the find_vma_srcu()?

I've not had time to look at it.
--
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/