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| author |   Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com> | 2020-06-16 02:06:38 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-06-17 12:49:09 -0600 |
| commit | bbde017a32b32d2fa8d5fddca25fade20132abf8 (patch) | |
| tree | 90d492437553c906b55d271e2effc71058e2c9e2 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | io_uring: don't fail links for EAGAIN error in IOPOLL mode (diff) | |
| download | wireguard-linux-bbde017a32b32d2fa8d5fddca25fade20132abf8.tar.xz wireguard-linux-bbde017a32b32d2fa8d5fddca25fade20132abf8.zip | |
io_uring: add memory barrier to synchronize io_kiocb's result and iopoll_completed
In io_complete_rw_iopoll(), stores to io_kiocb's result and iopoll
completed are two independent store operations, to ensure that once
iopoll_completed is ture and then req->result must been perceived by
the cpu executing io_do_iopoll(), proper memory barrier should be used.
And in io_do_iopoll(), we check whether req->result is EAGAIN, if it is,
we'll need to issue this io request using io-wq again. In order to just
issue a single smp_rmb() on the completion side, move the re-submit work
to io_iopoll_complete().
Cc: stable@vger.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
[axboe: don't set ->iopoll_completed for -EAGAIN retry]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions