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 -V3 00/25] THP support for PPC64
Date: Fri, 15 Mar 2013 15:09:42 +0530 [thread overview]
Message-ID: <1363340407-22619-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)
Hi,
This patchset adds transparent hugepage support for PPC64.
TODO:
* 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.
Change from V2:
* Change patch "powerpc: Reduce PTE table memory wastage" to use much simpler approach
for PTE page sharing.
* Changes to handle huge pages in KVM code.
* Address other review comments
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
next reply other threads:[~2013-03-15 9:40 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-15 9:39 Aneesh Kumar K.V [this message]
2013-03-15 9:39 ` [PATCH -V3 01/25] powerpc: Use signed formatting when printing error Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 02/25] powerpc: Save DAR and DSISR in pt_regs on MCE Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 03/25] powerpc: Don't hard code the size of pte page Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 04/25] powerpc: Reduce the PTE_INDEX_SIZE Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 05/25] powerpc: Move the pte free routines from common header Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 06/25] powerpc: Reduce PTE table memory wastage Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 07/25] powerpc: Use encode avpn where we need only avpn values Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 08/25] powerpc: Decode the pte-lp-encoding bits correctly Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 09/25] powerpc: Fix hpte_decode to use the correct decoding for page sizes Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 10/25] powerpc: Return all the valid pte ecndoing in KVM_PPC_GET_SMMU_INFO ioctl Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 11/25] powerpc: Update tlbie/tlbiel as per ISA doc Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 12/25] powerpc: print both base and actual page size on hash failure Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 13/25] powerpc: Print page size info during boot Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 14/25] mm/THP: HPAGE_SHIFT is not a #define on some arch Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 15/25] mm/THP: Add pmd args to pgtable deposit and withdraw APIs Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 16/25] mm/THP: withdraw the pgtable after pmdp related operations Aneesh Kumar K.V
2013-03-15 9:39 ` [PATCH -V3 17/25] powerpc/THP: Implement transparent hugepages for ppc64 Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 18/25] powerpc/THP: Double the PMD table size for THP Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 19/25] powerpc/THP: Differentiate THP PMD entries from HUGETLB PMD entries Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 20/25] powerpc/THP: Add code to handle HPTE faults for large pages Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 21/25] powerpc: Handle hugepage in perf callchain Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 22/25] powerpc/THP: get_user_pages_fast changes Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 23/25] powerpc/THP: Enable THP on PPC64 Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 24/25] powerpc: Optimize hugepage invalidate Aneesh Kumar K.V
2013-03-15 9:40 ` [PATCH -V3 25/25] powerpc: Handle hugepages in kvm Aneesh Kumar K.V
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