Hi Aneesh,
On 02/22/2013 12:47 AM, Aneesh Kumar K.V wrote:
Hi,
This patchset adds transparent huge page support for PPC64.
I am marking the series to linux-mm because the PPC64 implementation
required few interface changes to core THP code. I still have considerable
number of FIXME!! in the patchset mostly related to PPC64 mm susbsytem.
Those would require closer review and once we are clear on those changes,
I will drop those FIXME!! with necessary comments.
Some numbers:
The latency measurements code from Anton found at
http://ozlabs.org/~anton/junkcode/latency2001.c
Can this benchmark use for x86?
THP disabled 64K page size
------------------------
[root@llmp24l02 ~]# ./latency2001 8G
8589934592 731.73 cycles 205.77 ns
[root@llmp24l02 ~]# ./latency2001 8G
8589934592 743.39 cycles 209.05 ns
[root@llmp24l02 ~]#
THP disabled large page via hugetlbfs
-------------------------------------
[root@llmp24l02 ~]# ./latency2001 -l 8G
8589934592 416.09 cycles 117.01 ns
[root@llmp24l02 ~]# ./latency2001 -l 8G
8589934592 415.74 cycles 116.91 ns
THP enabled 64K page size.
----------------
[root@llmp24l02 ~]# ./latency2001 8G
8589934592 405.07 cycles 113.91 ns
[root@llmp24l02 ~]# ./latency2001 8G
8589934592 411.82 cycles 115.81 ns
[root@llmp24l02 ~]#
We are close to hugetlbfs in latency and we can achieve this with zero
config/page reservation. Most of the allocations above are fault allocated.
I haven't really measured the collapse alloc impact.
Another test that does 50000000 random access over 1GB area goes from
2.65 seconds to 1.07 seconds with this patchset.
Changes from RFC V1:
* HugeTLB fs now works
* Compile issues fixed
* rebased to v3.8
* Patch series reorded so that ppc64 cleanups and MM THP changes are moved
early in the series. This should help in picking those patches early.
Thanks,
-aneesh
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