> Because this is done the right way (i.e. to allocate an hugepage at
> the first wp fault, and to fallback exclusively if compaction fails)
> it will help much less than the 4k zero pages if the zero pages are
The main benefit is that you have a zero page with THP enabled.
So it lowers the cost
On 08/16/2012 12:40 PM, Andrea Arcangeli wrote:
> Hi Andrew,
>
> On Thu, Aug 16, 2012 at 12:20:23PM -0700, Andrew Morton wrote:
>> That's a pretty big improvement for a rather fake test case. I wonder
>> how much benefit we'd see with real workloads?
>
> The same discussion happened about the
Hi Andrew,
On Thu, Aug 16, 2012 at 12:20:23PM -0700, Andrew Morton wrote:
> That's a pretty big improvement for a rather fake test case. I wonder
> how much benefit we'd see with real workloads?
The same discussion happened about the zero page in general and
there's no easy answer. I seem to
On Thu, 9 Aug 2012 12:08:11 +0300
"Kirill A. Shutemov" wrote:
> During testing I noticed big (up to 2.5 times) memory consumption overhead
> on some workloads (e.g. ft.A from NPB) if THP is enabled.
>
> The main reason for that big difference is lacking zero page in THP case.
> We have to
On Thu, 9 Aug 2012 12:08:11 +0300
Kirill A. Shutemov kirill.shute...@linux.intel.com wrote:
During testing I noticed big (up to 2.5 times) memory consumption overhead
on some workloads (e.g. ft.A from NPB) if THP is enabled.
The main reason for that big difference is lacking zero page in
Hi Andrew,
On Thu, Aug 16, 2012 at 12:20:23PM -0700, Andrew Morton wrote:
That's a pretty big improvement for a rather fake test case. I wonder
how much benefit we'd see with real workloads?
The same discussion happened about the zero page in general and
there's no easy answer. I seem to
On 08/16/2012 12:40 PM, Andrea Arcangeli wrote:
Hi Andrew,
On Thu, Aug 16, 2012 at 12:20:23PM -0700, Andrew Morton wrote:
That's a pretty big improvement for a rather fake test case. I wonder
how much benefit we'd see with real workloads?
The same discussion happened about the zero page
Because this is done the right way (i.e. to allocate an hugepage at
the first wp fault, and to fallback exclusively if compaction fails)
it will help much less than the 4k zero pages if the zero pages are
The main benefit is that you have a zero page with THP enabled.
So it lowers the cost of
On Fri, Aug 10, 2012 at 11:49:12AM +0800, Wanpeng Li wrote:
> On Thu, Aug 09, 2012 at 12:08:11PM +0300, Kirill A. Shutemov wrote:
> >From: "Kirill A. Shutemov"
> >
> >During testing I noticed big (up to 2.5 times) memory consumption overhead
> >on some workloads (e.g. ft.A from NPB) if THP is
On Fri, Aug 10, 2012 at 11:49:12AM +0800, Wanpeng Li wrote:
On Thu, Aug 09, 2012 at 12:08:11PM +0300, Kirill A. Shutemov wrote:
From: Kirill A. Shutemov kirill.shute...@linux.intel.com
During testing I noticed big (up to 2.5 times) memory consumption overhead
on some workloads (e.g. ft.A
From: "Kirill A. Shutemov"
During testing I noticed big (up to 2.5 times) memory consumption overhead
on some workloads (e.g. ft.A from NPB) if THP is enabled.
The main reason for that big difference is lacking zero page in THP case.
We have to allocate a real page on read page fault.
A
From: Kirill A. Shutemov kirill.shute...@linux.intel.com
During testing I noticed big (up to 2.5 times) memory consumption overhead
on some workloads (e.g. ft.A from NPB) if THP is enabled.
The main reason for that big difference is lacking zero page in THP case.
We have to allocate a real page
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