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| author | Kevin Wolf <kwolf@redhat.com> | 2012-03-02 14:10:54 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2012-03-12 15:14:07 +0100 |
| commit | 250196f19c6e7df12965d74a5073e10aba06c802 (patch) | |
| tree | 53e93bcbfbf9355fe6d3f09e6045c3036959434c /trace-events | |
| parent | 256900b16b0264af9e165bceabbf74dcece4ea38 (diff) | |
| download | qemu-250196f19c6e7df12965d74a5073e10aba06c802.zip qemu-250196f19c6e7df12965d74a5073e10aba06c802.tar.gz qemu-250196f19c6e7df12965d74a5073e10aba06c802.tar.bz2 | |
qcow2: Reduce number of I/O requests
If the first part of a write request is allocated, but the second isn't
and it can be allocated so that the resulting area is contiguous, handle
it at once. This is a common case for sequential writes.
After this patch, alloc_cluster_offset() only checks if the clusters are
already allocated or how many new clusters can be allocated contigouosly.
The actual cluster allocation is split off into a new function
do_alloc_cluster_offset().
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Diffstat (limited to 'trace-events')
| -rw-r--r-- | trace-events | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/trace-events b/trace-events index d818ff1..606d903 100644 --- a/trace-events +++ b/trace-events @@ -320,6 +320,7 @@ qcow2_writev_done_part(void *co, int cur_nr_sectors) "co %p cur_nr_sectors %d" qcow2_writev_data(void *co, uint64_t offset) "co %p offset %" PRIx64 qcow2_alloc_clusters_offset(void *co, uint64_t offset, int n_start, int n_end) "co %p offet %" PRIx64 " n_start %d n_end %d" +qcow2_do_alloc_clusters_offset(void *co, uint64_t guest_offset, uint64_t host_offset, int nb_clusters) "co %p guest_offet %" PRIx64 " host_offset %" PRIx64 " nb_clusters %d" qcow2_cluster_alloc_phys(void *co) "co %p" qcow2_cluster_link_l2(void *co, int nb_clusters) "co %p nb_clusters %d" |