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Author SHA1 Message Date
Sasha Levin 4346fd8f1e kvm tools: remove global kvm object 
This was ugly, and now we get rid of it.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
 2015-06-01 16:39:53 +01:00
Sasha Levin 5124781543 kvm tools: Add debug mode to brlock 
Adds a debug mode which allows to switch the brlock into
a big rwlock.
This can be used to verify we don't end up with a BKL kind
of lock with the current brlock implementation.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
 2015-06-01 16:39:44 +01:00
Sasha Levin 0b907ed2ea kvm tools: Add a brlock 
brlock is a lock which is very cheap for reads, but very expensive
for writes.
This lock will be used when updates are very rare and reads are
common.
This lock is currently implemented by stopping the guest while
performing the updates. We assume that the only threads which
read from the locked data are VCPU threads, and the only writer
isn't a VCPU thread.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
 2015-06-01 16:39:44 +01:00