[dpdk-dev] [PATCH v3 0/3] 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 ALL lock usages since not all critical sections
protected by locks are friendly to HTM. For example, an attempt to perform
a HW I/O operation inside a hardware memory transaction always aborts
the transaction since the CPU is not able to roll-back should the transaction
fail. Therefore, hardware transactional locks are not advised to be used around
rte_eth_rx_burst() and rte_eth_tx_burst() calls.

Acked-by: Bruce Richardson <bruce.richardson@intel.com>

v3 changes
-resolved a conflict in app/test/Makefile
-don't use angle brackets for rte_common.h include

v2 changes
-added a documentation note about hardware limitations


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 | 208 +++++++++++++++++++
 .../common/include/generic/rte_spinlock.h          |  99 +++++++++
 lib/librte_eal/common/include/rte_rwlock.h         | 158 ---------------
 11 files changed, 874 insertions(+), 160 deletions(-)
 create mode 100644 app/test/test_hash_scaling.c
 create mode 100644 lib/librte_eal/common/include/arch/ppc_64/rte_rwlock.h
 create mode 100644 lib/librte_eal/common/include/arch/x86/rte_rtm.h
 create mode 100644 lib/librte_eal/common/include/arch/x86/rte_rwlock.h
 create mode 100644 lib/librte_eal/common/include/generic/rte_rwlock.h
 delete mode 100644 lib/librte_eal/common/include/rte_rwlock.h

-- 
1.9.5.msysgit.0

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