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qcow2: Set the default cache-clean-interval to 10 minutes

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The default cache-clean-interval is set to 10 minutes, in order to lower
the overhead of the qcow2 caches (before the default was 0, i.e.
disabled).

* For non-Linux platforms the default is kept at 0, because
  cache-clean-interval is not supported there yet.

Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Leonid Bloch 2018-09-26 19:04:46 +03:00 committed by Kevin Wolf
parent 45b4949c7b
commit e957b50b8d
5 changed files with 9 additions and 6 deletions
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2
block/qcow2.c
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@ -944,7 +944,7 @@ static int qcow2_update_options_prepare(BlockDriverState *bs,
/* New interval for cache cleanup timer */
r->cache_clean_interval =
qemu_opt_get_number(opts, QCOW2_OPT_CACHE_CLEAN_INTERVAL,
s->cache_clean_interval);
DEFAULT_CACHE_CLEAN_INTERVAL);
#ifndef CONFIG_LINUX
if (r->cache_clean_interval != 0) {
error_setg(errp, QCOW2_OPT_CACHE_CLEAN_INTERVAL

4
block/qcow2.h
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@ -76,13 +76,15 @@
#ifdef CONFIG_LINUX
#define DEFAULT_L2_CACHE_MAX_SIZE S_32MiB
#define DEFAULT_CACHE_CLEAN_INTERVAL 600 /* seconds */
#else
#define DEFAULT_L2_CACHE_MAX_SIZE S_8MiB
/* Cache clean interval is currently available only on Linux, so must be 0 */
#define DEFAULT_CACHE_CLEAN_INTERVAL 0
#endif
#define DEFAULT_CLUSTER_SIZE S_64KiB
#define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts"
#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"

4
docs/qcow2-cache.txt
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@ -210,8 +210,8 @@ This example removes all unused cache entries every 15 minutes:
-drive file=hd.qcow2,cache-clean-interval=900
If unset, the default value for this parameter is 0 and it disables
this feature.
If unset, the default value for this parameter is 600. Setting it to 0
disables this feature.
Note that this functionality currently relies on the MADV_DONTNEED
argument for madvise() to actually free the memory. This is a

3
qapi/block-core.json
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@ -2895,7 +2895,8 @@
#
# @cache-clean-interval: 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)
# is 600, and 0 disables this feature. (since 2.5)
#
# @encrypt: Image decryption options. Mandatory for
# encrypted images, except when doing a metadata-only
# probe of the image. (since 2.10)

2
qemu-options.hx
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@ -747,7 +747,7 @@ it which is not used for the L2 cache)
@item cache-clean-interval
Clean unused entries in the L2 and refcount caches. The interval is in seconds.
The default value is 0 and it disables this feature.
The default value is 600. Setting it to 0 disables this feature.
@item pass-discard-request
Whether discard requests to the qcow2 device should be forwarded to the data