[Xen-devel] [PATCH] Implementing "late pin, early unpin" for x86_64 xenlinux

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

The patched attached enables x86_64 xenlinux with "late pin, early
unpin", which is already implemented for x86_32. Since we now only pin
the root rather than any of the other levels, the overall performance
became better especially with workloads that require heavy memory
management operations. 

On 8-way x86_64 xenlinux (dom0) the kernel build was improved by about
10% (using make -j32). Even a small setup like a UP HT system, I see
about 3% performance gain with kernel build (make -j4).

Lmbench also shows improvements in fork/exec/sh:
Processor, Processes - times in microseconds - smaller is better
--------------------------------------------------------------------
Host    OS  Mhz   null null      open slct sig  sig  fork exec sh  
                  call  I/O stat clos TCP  inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- 
Linux 2.6.12- 3786 1.13 1.36 3.93 6.04 10.5 1.43 4.33 536. 1446 3614
Linux 2.6.12- 3786 1.13 1.36 3.91 6.03 10.4 1.44 4.38 346. 1050 2831

Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>

Jun
---
Intel Open Source Technology Center 

---
 b/linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mmu.h       |   33 ++
 linux-2.6-xen-sparse/arch/xen/x86_64/kernel/ldt.c             |   12 
 linux-2.6-xen-sparse/arch/xen/x86_64/mm/init.c                |    1 
 linux-2.6-xen-sparse/arch/xen/x86_64/mm/pageattr.c            |  154
+++++++++-
 linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/mmu_context.h |    6 
 linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/pgalloc.h     |  118
++++---
 linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/tlbflush.h    |    2 
 7 files changed, 265 insertions(+), 61 deletions(-)

Attachment: late_pin_early_unpin.patch
Description: late_pin_early_unpin.patch

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