[Xen-devel] [PATCH] Reduce overhead in find_domain_by_id() [0/2]

["Santos, Jose Renato G" <joserenato.santos@xxxxxx>]

This is a set of patches to improve performance of find_domain_by_id().
find_domain_by_id shows up high in profiles for network I/O intensive
workloads.
Most of the cost for this function comes from 3 main functions (of
aproximate equal costs): 1)read_lock(), 2)read_unlock() and
3)get_domain().
These patches replace the lock used for accessing domain_list and
domain_hash with a lock free RCU scheme. Experiments confirm that the
cost of find_domain_by_id() is in fact reduced by 2/3. 
The patches apply cleanly to changeset 12732.

Renato

Patches:
  1/2 - Import linux RCU code into Xen
  2/2 - replace domlist_lock operations by RCU operations

Signed-off-by: Jose Renato Santos <jsantos@xxxxxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel