[Xen-devel] [PATCHv6 0/6] gnttab: Improve scaleability

[David Vrabel <david.vrabel@xxxxxxxxxx>]

The series makes the grant table locking for fine-grained and add
per-VCPU maptrack free lists, which greatly improves scalability.

The series builds on the original series by Matt Wilson and Christoph
Egger from Amazon.

The per-VCPU maptrack free lists makes one of our aggregate intrahost
network throughput benchmarks increases from 15 Gbit/s to 75 Gbit/s,
when compared to just Amazon's original patches.

v6:
  * Remove most uses of the grant table lock.
  * Make the grant table lock a spin lock again (there were only
    writers left after the above)
  * Add per-VCPU maptrack free lists.
v5:
  * Addressed locking issue pointed out by Jan Beulich
  * Fixed git rebase merge issue introduced in v4
    (acquiring locking twice)
  * Change for ()-loop in grant_map_exists
  * Coding style fixes
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
  * Addressed locking issues in unmap_common pointed out
    by Jan Beulich
v3:
  * Addressed gnttab_swap_grant_ref() comment from Andrew Cooper
v2:
  * Add arm part per request from Julien Grall

David


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