[PATCH v4 0/2] gnttab: Improve scaleability

[Christoph Egger <chegger@amazon.de>]

This patch series changes the grant table locking to
a more fain grained locking protocol. The result is
a performance boost measured with blkfront/blkback.
Document the locking protocol.

v4:
  * Coding style nits from Jan Beulich
  * Fixup read locks pointed out by Jan Beulich
  * renamed double_gt_(un)lock to double_maptrack_(un)lock
    per request from Jan Beulich
  * Addressed ASSERT()'s from Jan Beulich

v3:
  * Addressed gnttab_swap_grant_ref() comment from Andrew Cooper
v2:
  * Add arm part per request from Julien Grall

Christoph Egger (1):
  gnttab: Introduce rwlock to protect updates to grant table state

Matt Wilson (1):
  gnttab: refactor locking for scalability

 docs/misc/grant-tables.txt    |   49 ++++++-
 xen/arch/arm/mm.c             |    4 +-
 xen/arch/x86/mm.c             |    4 +-
 xen/common/grant_table.c      |  321 +++++++++++++++++++++++++----------------
 xen/include/xen/grant_table.h |    9 +-
 5 files changed, 258 insertions(+), 129 deletions(-)

-- 
1.7.9.5