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Message-ID: <5f5e1353-6248-0e4a-ddd3-8eb0b1ba7f5c@gmail.com>
Date: Tue, 15 Jun 2021 10:51:16 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: Olivier Langlois <olivier@...llion01.com>,
Jens Axboe <axboe@...nel.dk>,
Steven Rostedt <rostedt@...dmis.org>,
Ingo Molnar <mingo@...hat.com>, io-uring@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] io_uring: Add to traces the req pointer when
available
On 5/31/21 7:36 AM, Olivier Langlois wrote:
> The req pointer uniquely identify a specific request.
> Having it in traces can provide valuable insights that is not possible
> to have if the calling process is reusing the same user_data value.
Patchset are usually accompanied with a cover letter. Also, there is
something wrong as b4 refuses to find the patch. Anyway...
Reviewed-by: Pavel Begunkov <asml.silence@...il.com>
> Signed-off-by: Olivier Langlois <olivier@...llion01.com>
> ---
> fs/io_uring.c | 11 ++---
> include/trace/events/io_uring.h | 71 ++++++++++++++++++++++++---------
> 2 files changed, 59 insertions(+), 23 deletions(-)
>
> diff --git a/fs/io_uring.c b/fs/io_uring.c
> index 903458afd56c..0737b0e76b91 100644
> --- a/fs/io_uring.c
> +++ b/fs/io_uring.c
> @@ -5059,7 +5059,7 @@ static void io_async_task_func(struct callback_head *cb)
> struct async_poll *apoll = req->apoll;
> struct io_ring_ctx *ctx = req->ctx;
>
> - trace_io_uring_task_run(req->ctx, req->opcode, req->user_data);
> + trace_io_uring_task_run(req->ctx, req, req->opcode, req->user_data);
>
> if (io_poll_rewait(req, &apoll->poll)) {
> spin_unlock_irq(&ctx->completion_lock);
> @@ -5192,8 +5192,8 @@ static bool io_arm_poll_handler(struct io_kiocb *req)
> return false;
> }
> spin_unlock_irq(&ctx->completion_lock);
> - trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask,
> - apoll->poll.events);
> + trace_io_uring_poll_arm(ctx, req, req->opcode, req->user_data,
> + mask, apoll->poll.events);
> return true;
> }
>
> @@ -6578,8 +6578,9 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
> goto fail_req;
>
> /* don't need @sqe from now on */
> - trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
> - true, ctx->flags & IORING_SETUP_SQPOLL);
> + trace_io_uring_submit_sqe(ctx, req, req->opcode, req->user_data,
> + req->flags, true,
> + ctx->flags & IORING_SETUP_SQPOLL);
>
> /*
> * If we already have a head request, queue this one for async
> diff --git a/include/trace/events/io_uring.h b/include/trace/events/io_uring.h
> index abb8b24744fd..12addad1f837 100644
> --- a/include/trace/events/io_uring.h
> +++ b/include/trace/events/io_uring.h
> @@ -323,8 +323,10 @@ TRACE_EVENT(io_uring_complete,
> * io_uring_submit_sqe - called before submitting one SQE
> *
> * @ctx: pointer to a ring context structure
> + * @req: pointer to a submitted request
> * @opcode: opcode of request
> * @user_data: user data associated with the request
> + * @flags request flags
> * @force_nonblock: whether a context blocking or not
> * @sq_thread: true if sq_thread has submitted this SQE
> *
> @@ -333,41 +335,60 @@ TRACE_EVENT(io_uring_complete,
> */
> TRACE_EVENT(io_uring_submit_sqe,
>
> - TP_PROTO(void *ctx, u8 opcode, u64 user_data, bool force_nonblock,
> - bool sq_thread),
> + TP_PROTO(void *ctx, void *req, u8 opcode, u64 user_data, u32 flags,
> + bool force_nonblock, bool sq_thread),
>
> - TP_ARGS(ctx, opcode, user_data, force_nonblock, sq_thread),
> + TP_ARGS(ctx, req, opcode, user_data, flags, force_nonblock, sq_thread),
>
> TP_STRUCT__entry (
> __field( void *, ctx )
> + __field( void *, req )
> __field( u8, opcode )
> __field( u64, user_data )
> + __field( u32, flags )
> __field( bool, force_nonblock )
> __field( bool, sq_thread )
> ),
>
> TP_fast_assign(
> __entry->ctx = ctx;
> + __entry->req = req;
> __entry->opcode = opcode;
> __entry->user_data = user_data;
> + __entry->flags = flags;
> __entry->force_nonblock = force_nonblock;
> __entry->sq_thread = sq_thread;
> ),
>
> - TP_printk("ring %p, op %d, data 0x%llx, non block %d, sq_thread %d",
> - __entry->ctx, __entry->opcode,
> - (unsigned long long) __entry->user_data,
> - __entry->force_nonblock, __entry->sq_thread)
> + TP_printk("ring %p, req %p, op %d, data 0x%llx, flags %u, "
> + "non block %d, sq_thread %d", __entry->ctx, __entry->req,
> + __entry->opcode, (unsigned long long)__entry->user_data,
> + __entry->flags, __entry->force_nonblock, __entry->sq_thread)
> );
>
> +/*
> + * io_uring_poll_arm - called after arming a poll wait if successful
> + *
> + * @ctx: pointer to a ring context structure
> + * @req: pointer to the armed request
> + * @opcode: opcode of request
> + * @user_data: user data associated with the request
> + * @mask: request poll events mask
> + * @events: registered events of interest
> + *
> + * Allows to track which fds are waiting for and what are the events of
> + * interest.
> + */
> TRACE_EVENT(io_uring_poll_arm,
>
> - TP_PROTO(void *ctx, u8 opcode, u64 user_data, int mask, int events),
> + TP_PROTO(void *ctx, void *req, u8 opcode, u64 user_data,
> + int mask, int events),
>
> - TP_ARGS(ctx, opcode, user_data, mask, events),
> + TP_ARGS(ctx, req, opcode, user_data, mask, events),
>
> TP_STRUCT__entry (
> __field( void *, ctx )
> + __field( void *, req )
> __field( u8, opcode )
> __field( u64, user_data )
> __field( int, mask )
> @@ -376,16 +397,17 @@ TRACE_EVENT(io_uring_poll_arm,
>
> TP_fast_assign(
> __entry->ctx = ctx;
> + __entry->req = req;
> __entry->opcode = opcode;
> __entry->user_data = user_data;
> __entry->mask = mask;
> __entry->events = events;
> ),
>
> - TP_printk("ring %p, op %d, data 0x%llx, mask 0x%x, events 0x%x",
> - __entry->ctx, __entry->opcode,
> - (unsigned long long) __entry->user_data,
> - __entry->mask, __entry->events)
> + TP_printk("ring %p, req %p, op %d, data 0x%llx, mask 0x%x, events 0x%x",
> + __entry->ctx, __entry->req, __entry->opcode,
> + (unsigned long long) __entry->user_data,
> + __entry->mask, __entry->events)
> );
>
> TRACE_EVENT(io_uring_poll_wake,
> @@ -440,27 +462,40 @@ TRACE_EVENT(io_uring_task_add,
> __entry->mask)
> );
>
> +/*
> + * io_uring_task_run - called when task_work_run() executes the poll events
> + * notification callbacks
> + *
> + * @ctx: pointer to a ring context structure
> + * @req: pointer to the armed request
> + * @opcode: opcode of request
> + * @user_data: user data associated with the request
> + *
> + * Allows to track when notified poll events are processed
> + */
> TRACE_EVENT(io_uring_task_run,
>
> - TP_PROTO(void *ctx, u8 opcode, u64 user_data),
> + TP_PROTO(void *ctx, void *req, u8 opcode, u64 user_data),
>
> - TP_ARGS(ctx, opcode, user_data),
> + TP_ARGS(ctx, req, opcode, user_data),
>
> TP_STRUCT__entry (
> __field( void *, ctx )
> + __field( void *, req )
> __field( u8, opcode )
> __field( u64, user_data )
> ),
>
> TP_fast_assign(
> __entry->ctx = ctx;
> + __entry->req = req;
> __entry->opcode = opcode;
> __entry->user_data = user_data;
> ),
>
> - TP_printk("ring %p, op %d, data 0x%llx",
> - __entry->ctx, __entry->opcode,
> - (unsigned long long) __entry->user_data)
> + TP_printk("ring %p, req %p, op %d, data 0x%llx",
> + __entry->ctx, __entry->req, __entry->opcode,
> + (unsigned long long) __entry->user_data)
> );
>
> #endif /* _TRACE_IO_URING_H */
>
--
Pavel Begunkov
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