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| author | Alberto Garcia <berto@igalia.com> | 2015-08-04 15:14:40 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2015-09-04 21:00:32 +0200 |
| commit | 279621c046ce57de0af9e3c00663b48d3a7835ae (patch) | |
| tree | e14d8ab78e7bfcddf42b763a120cc8d116d38430 /qapi | |
| parent | 355ee2d0e8ca536a6278c9c763ddd2f136eace3f (diff) | |
| download | qemu-279621c046ce57de0af9e3c00663b48d3a7835ae.zip qemu-279621c046ce57de0af9e3c00663b48d3a7835ae.tar.gz qemu-279621c046ce57de0af9e3c00663b48d3a7835ae.tar.bz2 | |
qcow2: add option to clean unused cache entries after some time
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 <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: a70d12da60433df9360ada648b3f34b8f6f354ce.1438690126.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/block-core.json | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json index 7b2efb8..bb2189e 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1592,6 +1592,10 @@ # @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. The default value +# is 0 and it disables this feature (since 2.5) +# # Since: 1.7 ## { 'struct': 'BlockdevOptionsQcow2', @@ -1603,7 +1607,8 @@ '*overlap-check': 'Qcow2OverlapChecks', '*cache-size': 'int', '*l2-cache-size': 'int', - '*refcount-cache-size': 'int' } } + '*refcount-cache-size': 'int', + '*cache-clean-interval': 'int' } } ## |