tree d773342247525f12874ae07ef39844bf2dd24558
parent 74de807f794ac5201b2b3c38ddadeef84a676a97
author Paolo Bonzini <pbonzini@redhat.com> 1445514690 +0200
committer Michael Tokarev <mjt@tls.msk.ru> 1446813758 +0300

exec: avoid unnecessary cacheline bounce on ram_list.mru_block

Whenever the MRU cache hits for the list of RAM blocks, qemu_get_ram_block
does an unnecessary write that causes a processor cache line to bounce
from one core to another.  This causes a performance hit.

Reported-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>