Re: [libvirt] [PATCH v2] qemu: Introduce caching whether /dev/kvm is accessible

Introduce caching whether /dev/kvm is usable as the QEMU user:QEMU group. This reduces the overhead of the QEMU capabilities cache lookup. Before this patch there were many fork() calls used for checking whether /dev/kvm is accessible. Now we store the result whether /dev/kvm is accessible or not and we only need to re-run the virFileAccessibleAs check if the ctime of /dev/kvm has changed. Suggested-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; Signed-off-by: Marc Hartmayer <mhartmay(a)linux.ibm.com&gt; --- src/qemu/qemu_capabilities.c | 54 ++++++++++++++++++++++++++++++++++-- 1 file changed, 52 insertions(+), 2 deletions(-)