On 05/26/2015 11:14 AM, Alberto Garcia wrote: > This adds a new 'cache-clean-interval' option that cleans all qcow2 > cache entries that haven't been used in a certain interval, given in > seconds. > > This allows setting a large L2 cache size so it can handle scenarios > with lots of I/O and at the same time use little memory during periods > of inactivity. > > This feature currently relies on MADV_DONTNEED to free that memory, so > it is not useful in systems that don't follow that behavior. > > Signed-off-by: Alberto Garcia <be...@igalia.com> > --- > block/qcow2-cache.c | 35 ++++++++++++++++++++++++++++ > block/qcow2.c | 64 > ++++++++++++++++++++++++++++++++++++++++++++++++++++ > block/qcow2.h | 4 ++++ > qapi/block-core.json | 6 ++++- > 4 files changed, 108 insertions(+), 1 deletion(-) >
> +++ b/qapi/block-core.json > @@ -1538,6 +1538,9 @@ > # @refcount-cache-size: #optional the maximum size of the refcount block > cache > # in bytes (since 2.2) > # > +# @cache-clean-interval: #optional clean unused entries in the L2 and > refcount > +# caches. The interval is in seconds (since 2.4) > +# > # Since: 1.7 Is there any QMP command that can query the current interval? I'm not a big fan of write-only interfaces. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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