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| author | Jackie Liu <[email protected]> | 2019-08-14 09:35:22 +0000 |
|---|---|---|
| committer | Jens Axboe <[email protected]> | 2019-08-15 17:21:39 +0000 |
| commit | a982eeb09b6030e567b8b815277c8c9197168040 (patch) | |
| tree | 1086aec4590f89b11422f491c0887e38cb5864e0 /tools/perf/scripts/python/sched-migration.py | |
| parent | block: remove REQ_NOWAIT_INLINE (diff) | |
| download | kernel-a982eeb09b6030e567b8b815277c8c9197168040.tar.gz kernel-a982eeb09b6030e567b8b815277c8c9197168040.zip | |
io_uring: fix an issue when IOSQE_IO_LINK is inserted into defer list
This patch may fix two issues:
First, when IOSQE_IO_DRAIN set, the next IOs need to be inserted into
defer list to delay execution, but link io will be actively scheduled to
run by calling io_queue_sqe.
Second, when multiple LINK_IOs are inserted together with defer_list,
the LINK_IO is no longer keep order.
|-------------|
| LINK_IO | ----> insert to defer_list -----------
|-------------| |
| LINK_IO | ----> insert to defer_list ----------|
|-------------| |
| LINK_IO | ----> insert to defer_list ----------|
|-------------| |
| NORMAL_IO | ----> insert to defer_list ----------|
|-------------| |
|
queue_work at same time <-----|
Fixes: 9e645e1105c ("io_uring: add support for sqe links")
Signed-off-by: Jackie Liu <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/sched-migration.py')
0 files changed, 0 insertions, 0 deletions