[dpdk-dev] add support for HTM lock elision for x86
Stephen Hemminger
stephen at networkplumber.org
Wed Jun 3 20:40:14 CEST 2015
On Tue, 2 Jun 2015 15:11:30 +0200
Roman Dementiev <roman.dementiev at intel.com> wrote:
>
> 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(-)
>
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You probably want to put a caveat around this, it won't work for people
that expect to use spinlocks to protect I/O operations on hardware.
Since I/O operations aren't like memory.
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