Re: [PATCHv6 00/22] Transparent huge page cache: phase 1, everythingbut mmap()

[Mel Gorman]

On Tue, Sep 24, 2013 at 04:37:40PM -0700, Andrew Morton wrote:
> On Mon, 23 Sep 2013 15:05:28 +0300 "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> 
> > It brings thp support for ramfs, but without mmap() -- it will be posted
> > separately.
> 
> We were never going to do this :(
> 
> Has anyone reviewed these patches much yet?
> 

I am afraid I never looked too closely once I learned that the primary
motivation for this was relieving iTLB pressure in a very specific
case. AFAIK, this is not a problem in the vast majority of modern CPUs
and I found it very hard to be motivated to review the series as a result.
I suspected that in many cases that the cost of IO would continue to dominate
performance instead of TLB pressure. I also found it unlikely that there
was a workload that was tmpfs based that used enough memory to be hurt
by TLB pressure. My feedback was that a much more compelling case for the
series was needed but this discussion all happened on IRC unfortunately.

-- 
Mel Gorman
SUSE Labs
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