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| author | Dylan Yudaken <dylany@fb.com> | 2022-06-22 06:40:23 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-07-24 18:39:15 -0600 |
| commit | f88262e60bb9cb5740891672ce9f405e7f9393e5 (patch) | |
| tree | bca01661645c35ef7958fd5b0a5f9438d9b9b477 /io_uring/tctx.c | |
| parent | c34398a8c018e0d3d2d30b718d03c7290c696f51 (diff) | |
| download | linux-f88262e60bb9cb5740891672ce9f405e7f9393e5.tar.gz linux-f88262e60bb9cb5740891672ce9f405e7f9393e5.tar.bz2 linux-f88262e60bb9cb5740891672ce9f405e7f9393e5.zip | |
io_uring: lockless task list
With networking use cases we see contention on the spinlock used to
protect the task_list when multiple threads try and add completions at once.
Instead we can use a lockless list, and assume that the first caller to
add to the list is responsible for kicking off task work.
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220622134028.2013417-4-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/tctx.c')
| -rw-r--r-- | io_uring/tctx.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/io_uring/tctx.c b/io_uring/tctx.c index 7a68ba9beec3..7f97d97fef0a 100644 --- a/io_uring/tctx.c +++ b/io_uring/tctx.c @@ -86,8 +86,7 @@ __cold int io_uring_alloc_task_context(struct task_struct *task, atomic_set(&tctx->in_idle, 0); atomic_set(&tctx->inflight_tracked, 0); task->io_uring = tctx; - spin_lock_init(&tctx->task_lock); - INIT_WQ_LIST(&tctx->task_list); + init_llist_head(&tctx->task_list); init_task_work(&tctx->task_work, tctx_task_work); return 0; } |