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| author | Joseph Qi <joseph.qi@linux.alibaba.com> | 2020-09-29 09:01:22 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-30 20:32:34 -0600 |
| commit | dbbe9c642411c359ad0a0e32442eb2e11d3811b5 (patch) | |
| tree | e567ae2471c72402ba352b4b3383995bbdd259ae /.get_maintainer.ignore | |
| parent | af9c1a44f8dee7a958e07977f24ba40e3c770987 (diff) | |
| download | lwn-dbbe9c642411c359ad0a0e32442eb2e11d3811b5.tar.gz lwn-dbbe9c642411c359ad0a0e32442eb2e11d3811b5.zip | |
io_uring: show sqthread pid and cpu in fdinfo
In most cases we'll specify IORING_SETUP_SQPOLL and run multiple
io_uring instances in a host. Since all sqthreads are named
"io_uring-sq", it's hard to distinguish the relations between
application process and its io_uring sqthread.
With this patch, application can get its corresponding sqthread pid
and cpu through show_fdinfo.
Steps:
1. Get io_uring fd first.
$ ls -l /proc/<pid>/fd | grep -w io_uring
2. Then get io_uring instance related info, including corresponding
sqthread pid and cpu.
$ cat /proc/<pid>/fdinfo/<io_uring_fd>
pos: 0
flags: 02000002
mnt_id: 13
SqThread: 6929
SqThreadCpu: 2
UserFiles: 1
0: testfile
UserBufs: 0
PollList:
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
[axboe: fixed for new shared SQPOLL]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '.get_maintainer.ignore')
0 files changed, 0 insertions, 0 deletions