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io_uring: extend task put optimisations 

Now with IRQ completions done via IRQ, almost all requests freeing
are done from the context of submitter task, so it makes sense to
extend task_put optimisation from io_req_free_batch_finish() to cover
all the cases including task_work by moving it into io_put_task().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/824a7cbd745ddeee4a0f3ff85c558a24fd005872.1629302453.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-08-18 17:01:43 +01:00 committed by Jens Axboe
parent 316319e82f
commit e98e49b2bb
1 changed files with 9 additions and 7 deletions
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16
fs/io_uring.c
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@ -1623,10 +1623,14 @@ static inline void io_put_task(struct task_struct *task, int nr)
{
struct io_uring_task *tctx = task->io_uring;
percpu_counter_sub(&tctx->inflight, nr);
if (unlikely(atomic_read(&tctx->in_idle)))
wake_up(&tctx->wait);
put_task_struct_many(task, nr);
if (likely(task == current)) {
tctx->cached_refs += nr;
} else {
percpu_counter_sub(&tctx->inflight, nr);
if (unlikely(atomic_read(&tctx->in_idle)))
wake_up(&tctx->wait);
put_task_struct_many(task, nr);
}
}
static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data,
@ -2171,9 +2175,7 @@ static void io_req_free_batch_finish(struct io_ring_ctx *ctx,
{
if (rb->ctx_refs)
percpu_ref_put_many(&ctx->refs, rb->ctx_refs);
if (rb->task == current)
current->io_uring->cached_refs += rb->task_refs;
else if (rb->task)
if (rb->task)
io_put_task(rb->task, rb->task_refs);
}