diff options
| author | Stefano Garzarella <sgarzare@redhat.com> | 2021-07-21 11:42:10 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2021-07-21 13:47:50 +0100 |
| commit | 1793ad0247cad35db1ebbc04fbea0446c30a27ca (patch) | |
| tree | 3b26eff84f99fa68fcef95a40b52a3aa48ce9f72 /util/async.c | |
| parent | 0445409d7497bededa1047f0d8298b0d4bb3b1a3 (diff) | |
| download | qemu-1793ad0247cad35db1ebbc04fbea0446c30a27ca.zip qemu-1793ad0247cad35db1ebbc04fbea0446c30a27ca.tar.gz qemu-1793ad0247cad35db1ebbc04fbea0446c30a27ca.tar.bz2 | |
iothread: add aio-max-batch parameter
The `aio-max-batch` parameter will be propagated to AIO engines
and it will be used to control the maximum number of queued requests.
When there are in queue a number of requests equal to `aio-max-batch`,
the engine invokes the system call to forward the requests to the kernel.
This parameter allows us to control the maximum batch size to reduce
the latency that requests might accumulate while queued in the AIO
engine queue.
If `aio-max-batch` is equal to 0 (default value), the AIO engine will
use its default maximum batch size value.
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20210721094211.69853-3-sgarzare@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util/async.c')
| -rw-r--r-- | util/async.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/util/async.c b/util/async.c index 9a41591..6f6717a 100644 --- a/util/async.c +++ b/util/async.c @@ -554,6 +554,8 @@ AioContext *aio_context_new(Error **errp) ctx->poll_grow = 0; ctx->poll_shrink = 0; + ctx->aio_max_batch = 0; + return ctx; fail: g_source_destroy(&ctx->source); |