[dpdk-dev] add support for HTM lock elision for x86

[Roman Dementiev <roman.dementiev@intel.com>]

This series of patches adds methods that use hardware memory transactions (HTM)
on fast-path for DPDK locks (a.k.a. lock elision). Here the methods are implemented 
for x86 using Restricted Transactional Memory instructions (Intel(r) Transactional 
Synchronization Extensions). The implementation fall-backs to the normal DPDK lock
if HTM is not available or memory transactions fail.
This is not a replacement for lock usages since not all critical sections protected
by locks are friendly to HTM.

Roman Dementiev (3):
 spinlock: add support for HTM lock elision for x86 
 rwlock: add support for HTM lock elision for x86
 test scaling of HTM lock elision protecting rte_hash

 app/test/Makefile                                  |   1 +
 app/test/test_hash_scaling.c                       | 223 +++++++++++++++++++++
 lib/librte_eal/common/Makefile                     |   4 +-
 .../common/include/arch/ppc_64/rte_rwlock.h        |  38 ++++
 .../common/include/arch/ppc_64/rte_spinlock.h      |  41 ++++
 lib/librte_eal/common/include/arch/x86/rte_rtm.h   |  73 +++++++
 .../common/include/arch/x86/rte_rwlock.h           |  82 ++++++++
 .../common/include/arch/x86/rte_spinlock.h         | 107 ++++++++++
 lib/librte_eal/common/include/generic/rte_rwlock.h | 194 ++++++++++++++++++
 .../common/include/generic/rte_spinlock.h          |  75 +++++++
 lib/librte_eal/common/include/rte_rwlock.h         | 158 ---------------
 11 files changed, 836 insertions(+), 160 deletions(-)

Intel GmbH
Dornacher Strasse 1
85622 Feldkirchen/Muenchen, Deutschland
Sitz der Gesellschaft: Feldkirchen bei Muenchen
Geschaeftsfuehrer: Christian Lamprechter, Hannes Schwaderer, Douglas Lusk
Registergericht: Muenchen HRB 47456
Ust.-IdNr./VAT Registration No.: DE129385895
Citibank Frankfurt a.M. (BLZ 502 109 00) 600119052