From: Paolo Bonzini <pbonzini@redhat.com>
To: Zhenyu Ye <yezhenyu2@huawei.com>, Stefan Hajnoczi <stefanha@redhat.com>
Cc: fam@euphon.net, Kevin Wolf <kwolf@redhat.com>,
Zhanghailiang <zhang.zhanghailiang@huawei.com>,
qemu-block@nongnu.org, qemu-devel@nongnu.org,
xiexiangyou@huawei.com, armbru@redhat.com, mreitz@redhat.com
Subject: Re: [PATCH v1 0/2] Add timeout mechanism to qmp actions
Date: Mon, 19 Oct 2020 15:25:24 +0200 [thread overview]
Message-ID: <6fd02e2b-50fa-b667-efc6-47d1765bdd8c@redhat.com> (raw)
In-Reply-To: <f70dc6ce-385b-a4f9-04a0-244018f3ddbb@huawei.com>
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'
> b'schedule'
> b'io_schedule'
> b'blk_mq_get_tag'
> b'blk_mq_get_request'
> b'blk_mq_make_request'
> b'generic_make_request'
> b'submit_bio'
> b'blkdev_direct_IO'
> b'generic_file_read_iter'
> b'aio_read'
> b'io_submit_one'
> b'__x64_sys_io_submit'
> b'do_syscall_64'
> b'entry_SYSCALL_64_after_hwframe'
> - fio (1464)
> 40031912
>
> And Linux io_uring can avoid the latency problem.
What filesystem are you using?
Paolo
next prev parent reply other threads:[~2020-10-19 13:26 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-10 14:52 [PATCH v1 0/2] Add timeout mechanism to qmp actions Zhenyu Ye
2020-08-10 14:52 ` [PATCH v1 1/2] util: introduce aio_context_acquire_timeout Zhenyu Ye
2020-08-10 14:52 ` [PATCH v1 2/2] qmp: use aio_context_acquire_timeout replace aio_context_acquire Zhenyu Ye
2020-08-10 15:38 ` [PATCH v1 0/2] Add timeout mechanism to qmp actions Kevin Wolf
2020-08-11 13:54 ` Zhenyu Ye
2020-08-21 12:52 ` Stefan Hajnoczi
2020-09-14 13:27 ` Stefan Hajnoczi
2020-09-17 7:36 ` Zhenyu Ye
2020-09-17 10:10 ` Fam Zheng
2020-09-17 15:44 ` Stefan Hajnoczi
2020-09-17 16:01 ` Fam Zheng
2020-09-18 11:23 ` Zhenyu Ye
2020-09-18 14:06 ` Fam Zheng
2020-09-19 2:22 ` Zhenyu Ye
2020-09-21 11:14 ` Fam Zheng
2020-10-13 10:00 ` Stefan Hajnoczi
2020-10-19 12:40 ` Zhenyu Ye
2020-10-19 13:25 ` Paolo Bonzini [this message]
2020-10-20 1:34 ` Zhenyu Ye
2020-10-22 16:29 ` Fam Zheng
2020-12-08 13:10 ` Stefan Hajnoczi
2020-12-08 13:47 ` Glauber Costa
2020-12-14 16:33 ` Stefan Hajnoczi
2020-12-21 11:30 ` Zhenyu Ye
2020-09-14 14:42 ` Daniel P. Berrangé
2020-09-17 8:12 ` Zhenyu Ye
2020-08-12 13:51 ` Stefan Hajnoczi
2020-08-13 1:51 ` Zhenyu Ye
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