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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
Subject: [PATCH -V2 00/26]T HP support for PPC64
Date: Wed,  6 Mar 2013 11:40:01 +0530	[thread overview]
Message-ID: <1362550227-575-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)

Hi,

This patchset adds transparent huge page support for PPC64.

TODO:
* ppc64 KVM related changes
* powernv still doesn't boot
* hash preload support in update_mmu_cache_pmd

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 V1
* Address review comments
* More patch split
* Add batch hpte invalidate for hugepages.

Changes from RFC V2:
* Address review comments
* More code cleanup and patch split

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

             reply	other threads:[~2013-03-06  6:10 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-06  6:10 Aneesh Kumar K.V [this message]
2013-03-06  6:10 ` [PATCH -V2 01/26] powerpc: Use signed formatting when printing error Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 02/26] powerpc: Save DAR and DSISR in pt_regs on MCE Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 03/26] powerpc: Don't hard code the size of pte page Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 04/26] powerpc: Reduce the PTE_INDEX_SIZE Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 05/26] powerpc: Move the pte free routines from common header Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 06/26] powerpc: Reduce PTE table memory wastage Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 07/26] powerpc: Add size argument to pgtable_cache_add Aneesh Kumar K.V
2013-03-13  2:47   ` Paul Mackerras
2013-03-13  9:25     ` Aneesh Kumar K.V
2013-03-13 11:34       ` Paul Mackerras
2013-03-06  6:10 ` [PATCH -V2 08/26] powerpc: Clarify __pgtable_cache_add by renaming shift to index Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 09/26] powerpc: Use encode avpn where we need only avpn values Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 10/26] powerpc: Decode the pte-lp-encoding bits correctly Aneesh Kumar K.V
2013-03-13  4:09   ` Paul Mackerras
2013-03-06  6:10 ` [PATCH -V2 11/26] powerpc: Fix hpte_decode to use the correct decoding for page sizes Aneesh Kumar K.V
2013-03-13  2:56   ` Paul Mackerras
2013-03-06  6:10 ` [PATCH -V2 12/26] powerpc: Return all the valid pte ecndoing in KVM_PPC_GET_SMMU_INFO ioctl Aneesh Kumar K.V
2013-03-13  4:11   ` Paul Mackerras
2013-03-06  6:10 ` [PATCH -V2 13/26] powerpc: Update tlbie/tlbiel as per ISA doc Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 14/26] powerpc: print both base and actual page size on hash failure Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 15/26] powerpc: Print page size info during boot Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 16/26] mm/THP: HPAGE_SHIFT is not a #define on some arch Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 17/26] mm/THP: Add pmd args to pgtable deposit and withdraw APIs Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 18/26] mm/THP: withdraw the pgtable after pmdp related operations Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 19/26] powerpc/THP: Implement transparent huge pages for ppc64 Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 20/26] powerpc/THP: Differentiate THP PMD entries from HUGETLB PMD entries Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 21/26] powerpc/THP: Add code to handle HPTE faults for large pages Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 22/26] powerpc: Handle huge page in perf callchain Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 23/26] powerpc/THP: hypervisor require few WIMG bit set Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 24/26] powerpc/THP: get_user_pages_fast changes Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 25/26] powerpc/THP: Enable THP on PPC64 Aneesh Kumar K.V
2013-03-06  6:10 ` [PATCH -V2 26/26] powerpc: Optimize hugepage invalidate Aneesh Kumar K.V

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