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| author | Alberto Garcia <berto@igalia.com> | 2015-05-11 15:54:53 +0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-05-22 17:08:01 +0200 |
| commit | 72e80b89015bab196f0f0e83b12b0eee75fa0574 (patch) | |
| tree | bccf75bc1b4f2268827580f456f55770cc29a93e /block/qcow2.h | |
| parent | 13c4941cdd8685d28c7e3a09e393a5579b58db46 (diff) | |
| download | qemu-72e80b89015bab196f0f0e83b12b0eee75fa0574.tar.gz qemu-72e80b89015bab196f0f0e83b12b0eee75fa0574.tar.bz2 qemu-72e80b89015bab196f0f0e83b12b0eee75fa0574.zip | |
qcow2: use one single memory block for the L2/refcount cache tables
The qcow2 L2/refcount cache contains one separate table for each cache
entry. Doing one allocation per table adds unnecessary overhead and it
also requires us to store the address of each table separately.
Since the size of the cache is constant during its lifetime, it's
better to have an array that contains all the tables using one single
allocation.
In my tests measuring freshly created caches with sizes 128MB (L2) and
32MB (refcount) this uses around 10MB of RAM less.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/qcow2.h')
| -rw-r--r-- | block/qcow2.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index 422b825138..5d0995f03d 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -574,7 +574,8 @@ int qcow2_read_snapshots(BlockDriverState *bs); Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables); int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c); -void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table); +void qcow2_cache_entry_mark_dirty(BlockDriverState *bs, Qcow2Cache *c, + void *table); int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c); int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c, Qcow2Cache *dependency); |