It is better to fail migration in case of failure to
allocate new cache item
Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

Some source files #include the same header more than
once for no good reason.  Remove second #includes in
such cases.
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

The page cache frees all data on finish, on resize and
if there is collision on insert. So it should be the caches
responsibility to dup the data that is stored in the cache.
Signed-off-by: NPeter Lieven <pl@kamp.de>
Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

XBZRLE encoded migration introduced a MRU page cache
meachnism. Unfortunately, cached items where never freed in
case of a collision in the page cache on cache_insert().

This lead to out of memory conditions during XBZRLE migration
if the page cache was small and there where a lot of collisions
in the cache.
Signed-off-by: NPeter Lieven <pl@kamp.de>
Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

Instead of using cache_insert do the update itself
Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Add MRU page cache mechanism.
The page are accessed by their address.
Signed-off-by: NBenoit Hudzia <benoit.hudzia@sap.com>
Signed-off-by: NPetter Svard <petters@cs.umu.se>
Signed-off-by: NAidan Shribman <aidan.shribman@sap.com>
Signed-off-by: NOrit Wasserman <owasserm@redhat.com>
Reviewed-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>