From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org
Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org
Subject: [RFC PATCH -V2 00/21] THP support for PPC64
Date: Thu, 21 Feb 2013 22:17:07 +0530 [thread overview]
Message-ID: <1361465248-10867-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)
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
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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next reply other threads:[~2013-02-21 16:47 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-21 16:47 Aneesh Kumar K.V [this message]
2013-02-21 16:47 ` [RFC PATCH -V2 01/21] powerpc: Use signed formatting when printing error Aneesh Kumar K.V
2013-02-22 5:00 ` Paul Mackerras
2013-02-21 16:47 ` [RFC PATCH -V2 02/21] powerpc: Save DAR and DSISR in pt_regs on MCE Aneesh Kumar K.V
2013-02-22 5:03 ` Paul Mackerras
2013-02-21 16:47 ` [RFC PATCH -V2 03/21] powerpc: Don't hard code the size of pte page Aneesh Kumar K.V
2013-02-22 5:06 ` Paul Mackerras
2013-02-23 16:17 ` Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 04/21] powerpc: Reduce the PTE_INDEX_SIZE Aneesh Kumar K.V
2013-02-22 5:07 ` Paul Mackerras
2013-02-21 16:47 ` [RFC PATCH -V2 05/21] powerpc: Reduce PTE table memory wastage Aneesh Kumar K.V
2013-02-22 0:32 ` David Gibson
2013-02-22 5:14 ` Aneesh Kumar K.V
2013-02-22 5:23 ` Paul Mackerras
2013-02-22 17:20 ` Aneesh Kumar K.V
2013-02-23 16:38 ` Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 06/21] powerpc: Add size argument to pgtable_cache_add Aneesh Kumar K.V
2013-02-22 5:27 ` Paul Mackerras
2013-02-21 16:47 ` [RFC PATCH -V2 07/21] powerpc: Use encode avpn where we need only avpn values Aneesh Kumar K.V
2013-02-22 5:28 ` Paul Mackerras
2013-02-21 16:47 ` [RFC PATCH -V2 08/21] powerpc: Decode the pte-lp-encoding bits correctly Aneesh Kumar K.V
2013-02-22 5:37 ` Paul Mackerras
2013-02-24 16:51 ` Aneesh Kumar K.V
2013-02-24 17:45 ` Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 09/21] powerpc: Update tlbie/tlbiel as per ISA doc Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 10/21] powerpc: print both base and actual page size on hash failure Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 11/21] powerpc: Print page size info during boot Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 12/21] powerpc: Fix hpte_decode to use the correct decoding for page sizes Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 13/21] mm/THP: HPAGE_SHIFT is not a #define on some arch Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 14/21] mm/THP: Add pmd args to pgtable deposit and withdraw APIs Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 15/21] mm/THP: support for zerout withdraw Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 16/21] powerpc/THP: Implement transparent huge pages for ppc64 Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 17/21] powerpc/THP: Differentiate THP PMD entries from HUGETLB PMD entries Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 18/21] powerpc/THP: Add code to handle HPTE faults for large pages Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 19/21] powerpc/THP: hypervisor require few WIMG bit set Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 20/21] powerpc/THP: get_user_pages_fast changes Aneesh Kumar K.V
2013-02-21 16:47 ` [RFC PATCH -V2 21/21] powerpc/THP: Enable THP on PPC64 Aneesh Kumar K.V
2013-03-21 8:17 ` [RFC PATCH -V2 00/21] THP support for PPC64 Simon Jeons
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