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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2020-03-19 16:35:59 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2020-03-23 11:05:44 +0000 |
| commit | ff807d559205a434fd37d3343f01a0ab128bd190 (patch) | |
| tree | 6a914a7b42b68bb6b2e2fb2978926da9cc18e8b1 /util | |
| parent | 29e0855c5af62bbb0b0b6fed792e004dad92ba95 (diff) | |
| download | qemu-ff807d559205a434fd37d3343f01a0ab128bd190.zip qemu-ff807d559205a434fd37d3343f01a0ab128bd190.tar.gz qemu-ff807d559205a434fd37d3343f01a0ab128bd190.tar.bz2 | |
aio-posix: fix io_uring with external events
When external event sources are disabled fdmon-io_uring falls back to
fdmon-poll. The ->need_wait() callback needs to watch for this so it
can return true when external event sources are disabled.
It is also necessary to call ->wait() when AioHandlers have changed
because io_uring is asynchronous and we must submit new sqes.
Both of these changes to ->need_wait() together fix tests/test-aio -p
/aio/external-client, which failed with:
test-aio: tests/test-aio.c:404: test_aio_external_client: Assertion `aio_poll(ctx, false)' failed.
Reported-by: Julia Suvorova <jusual@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20200319163559.117903-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'util')
| -rw-r--r-- | util/fdmon-io_uring.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/util/fdmon-io_uring.c b/util/fdmon-io_uring.c index 893b79b..7e143ef 100644 --- a/util/fdmon-io_uring.c +++ b/util/fdmon-io_uring.c @@ -290,7 +290,18 @@ static int fdmon_io_uring_wait(AioContext *ctx, AioHandlerList *ready_list, static bool fdmon_io_uring_need_wait(AioContext *ctx) { - return io_uring_cq_ready(&ctx->fdmon_io_uring); + /* Have io_uring events completed? */ + if (io_uring_cq_ready(&ctx->fdmon_io_uring)) { + return true; + } + + /* Do we need to submit new io_uring sqes? */ + if (!QSLIST_EMPTY_RCU(&ctx->submit_list)) { + return true; + } + + /* Are we falling back to fdmon-poll? */ + return atomic_read(&ctx->external_disable_cnt); } static const FDMonOps fdmon_io_uring_ops = { |