Hi Stefan,
On 2020/9/14 21:27, Stefan Hajnoczi wrote:
>>
>> Theoretically, everything running in an iothread is asynchronous. However,
>> some 'asynchronous' actions are not non-blocking entirely, such as
>> io_submit(). This will block while the iodepth is too big and I/O pressure
>> is too high
Hi Daniel,
On 2020/9/14 22:42, Daniel P. Berrangé wrote:
> On Tue, Aug 11, 2020 at 09:54:08PM +0800, Zhenyu Ye wrote:
>> Hi Kevin,
>>
>> On 2020/8/10 23:38, Kevin Wolf wrote:
>>> Am 10.08.2020 um 16:52 hat Zhenyu Ye geschrieben:
>>>> Before doing qmp acti
Hi Stefan, Fam,
On 2020/9/18 0:01, Fam Zheng wrote:
> On 2020-09-17 16:44, Stefan Hajnoczi wrote:
>> On Thu, Sep 17, 2020 at 03:36:57PM +0800, Zhenyu Ye wrote:
>>> When the hang occurs, the QEMU is blocked at:
>>>
>>> #0 0x95762b64 in ?? () fr
On 2020/9/18 22:06, Fam Zheng wrote:
>
> I can see how blocking in a slow io_submit can cause trouble for main
> thread. I think one way to fix it (until it's made truly async in new
> kernels) is moving the io_submit call to thread pool, and wrapped in a
> coroutine, perhaps.
>
I'm not sure if a
Hi Stefan,
On 2020/10/13 18:00, Stefan Hajnoczi wrote:
>
> Sorry, I lost track of this on-going email thread.
>
> Thanks for the backtrace. It shows the io_submit call is done while the
> AioContext lock is held. The monitor thread is waiting for the
> IOThread's AioContext lock. vcpus threads c
On 2020/10/19 21:25, Paolo Bonzini wrote:
> On 19/10/20 14:40, Zhenyu Ye wrote:
>> The kernel backtrace for io_submit in GUEST is:
>>
>> guest# ./offcputime -K -p `pgrep -nx fio`
>> b'finish_task_switch'
>> b'__schedule&#x
Hi all,
commit 8dcd3c9b91 ("qemu-img: align result of is_allocated_sectors")
introduces block alignment when doing qemu-img convert. However, the
alignment is:
s.alignment = MAX(pow2floor(s.min_sparse),
DIV_ROUND_UP(out_bs->bl.request_alignment,
ping?
On 2021/4/2 11:52, Zhenyu Ye wrote:
> Hi all,
>
> commit 8dcd3c9b91 ("qemu-img: align result of is_allocated_sectors")
> introduces block alignment when doing qemu-img convert. However, the
> alignment is:
>
> s.alignme
On 2021/8/3 23:03, Eric Blake wrote:
> On Fri, Apr 02, 2021 at 11:52:25AM +0800, Zhenyu Ye wrote:
>> Hi all,
>>
>> commit 8dcd3c9b91 ("qemu-img: align result of is_allocated_sectors")
>> introduces block alignment when doing qemu-img convert. However, the
&g
the I/O returns slowly, the main thread will be stuck
until the lock is released, which will affect the vcpu operation
and finall cause the vm to be stuck.
Signed-off-by: Zhenyu Ye
---
block/qapi.c | 6 --
1 file changed, 6 deletions(-)
diff --git a/block/qapi.c b/block/qapi.c
index
qmp actions.
Zhenyu Ye (2):
util: introduce aio_context_acquire_timeout
qmp: use aio_context_acquire_timeout replace aio_context_acquire
block/qapi-sysemu.c | 7 ++-
block/qapi.c| 6 +-
blockdev.c | 35
aio_context_acquire_timeout(),
which will return ETIMEDOUT after @t seconds.
This will be used in next patch.
Signed-off-by: Zhenyu Ye
---
include/block/aio.h | 5 +
include/qemu/thread-posix.h | 1 +
include/qemu/thread.h | 1 +
util/async.c| 10 ++
util/qemu-thread
the
waiting time exceeds LOCK_TIMEOUT (default set to 3 seconds).
Signed-off-by: Zhenyu Ye
---
block/qapi-sysemu.c | 7 ++-
block/qapi.c| 6 +-
blockdev.c | 35 ++-
include/block/aio.h | 1 +
4 files changed, 42 insertions(+), 7
Hi Kevin,
On 2020/8/10 23:38, Kevin Wolf wrote:
> Am 10.08.2020 um 16:52 hat Zhenyu Ye geschrieben:
>> Before doing qmp actions, we need to lock the qemu_global_mutex,
>> so the qmp actions should not take too long time.
>>
>> Unfortunately, some qmp actions need
Hi Stefan,
On 2020/8/12 21:51, Stefan Hajnoczi wrote:
> On Mon, Aug 10, 2020 at 10:52:44PM +0800, Zhenyu Ye wrote:
>> Before doing qmp actions, we need to lock the qemu_global_mutex,
>> so the qmp actions should not take too long time.
>>
>> Unfortunately, some qmp
On 2020/12/15 0:33, Stefan Hajnoczi wrote:
> On Tue, Dec 08, 2020 at 08:47:42AM -0500, Glauber Costa wrote:
>> The work we did at the time was in fixing those things in the kernel
>> as much as we could.
>> But the API is just like that...
>
The best way for us is to replace io_submit with io_uri
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