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| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-01-22 09:03:14 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2013-01-25 18:18:35 +0100 |
| commit | 402a47411bff5e849dc880dd08ba7e6564e6e4f4 (patch) | |
| tree | d4c5328c2342f71d41157708c88699ad3d8597e0 /trace-events | |
| parent | 08e4ed6cdeeee7912072cf14aa8ab6c60dacb4fb (diff) | |
| download | qemu-402a47411bff5e849dc880dd08ba7e6564e6e4f4.zip qemu-402a47411bff5e849dc880dd08ba7e6564e6e4f4.tar.gz qemu-402a47411bff5e849dc880dd08ba7e6564e6e4f4.tar.bz2 | |
mirror: support more than one in-flight AIO operation
With AIO support in place, we can start copying more than one chunk
in parallel. This patch introduces the required infrastructure for
this: the buffer is split into multiple granularity-sized chunks,
and there is a free list to access them.
Because of copy-on-write, a single operation may already require
multiple chunks to be available on the free list.
In addition, two different iterations on the HBitmap may want to
copy the same cluster. We avoid this by keeping a bitmap of in-flight
I/O operations, and blocking until the previous iteration completes.
This should be a pretty rare occurrence, though; as long as there is
no overlap the next iteration can start before the previous one finishes.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'trace-events')
| -rw-r--r-- | trace-events | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/trace-events b/trace-events index 43e6b73..b4a23cd 100644 --- a/trace-events +++ b/trace-events @@ -86,7 +86,9 @@ mirror_before_sleep(void *s, int64_t cnt, int synced) "s %p dirty count %"PRId64 mirror_one_iteration(void *s, int64_t sector_num, int nb_sectors) "s %p sector_num %"PRId64" nb_sectors %d" mirror_cow(void *s, int64_t sector_num) "s %p sector_num %"PRId64 mirror_iteration_done(void *s, int64_t sector_num, int nb_sectors, int ret) "s %p sector_num %"PRId64" nb_sectors %d ret %d" -mirror_yield(void *s, int64_t cnt, int in_flight) "s %p dirty count %"PRId64" in_flight %d" +mirror_yield(void *s, int64_t cnt, int buf_free_count, int in_flight) "s %p dirty count %"PRId64" free buffers %d in_flight %d" +mirror_yield_in_flight(void *s, int64_t sector_num, int in_flight) "s %p sector_num %"PRId64" in_flight %d" +mirror_yield_buf_busy(void *s, int nb_chunks, int in_flight) "s %p requested chunks %d in_flight %d" # blockdev.c qmp_block_job_cancel(void *job) "job %p" |