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io_uring: warn when ring exit takes too long

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We use system_unbound_wq to run io_ring_exit_work(), so it's hard to
monitor whether removal hang or not. Add WARN_ONCE to catch hangs.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-03-06 11:02:16 +00:00 committed by Jens Axboe
parent baf186c4d3
commit b5bb3a24f6
1 changed files with 5 additions and 0 deletions
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5
fs/io_uring.c
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@ -8560,6 +8560,7 @@ static void io_tctx_exit_cb(struct callback_head *cb)
static void io_ring_exit_work(struct work_struct *work)
{
struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx, exit_work);
unsigned long timeout = jiffies + HZ * 60 * 5;
struct io_tctx_exit exit;
struct io_tctx_node *node;
int ret;
@ -8572,10 +8573,14 @@ static void io_ring_exit_work(struct work_struct *work)
*/
do {
io_uring_try_cancel_requests(ctx, NULL, NULL);
WARN_ON_ONCE(time_after(jiffies, timeout));
} while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20));
mutex_lock(&ctx->uring_lock);
while (!list_empty(&ctx->tctx_list)) {
WARN_ON_ONCE(time_after(jiffies, timeout));
node = list_first_entry(&ctx->tctx_list, struct io_tctx_node,
ctx_node);
exit.ctx = ctx;