From: Pratyush Anand <panand@redhat.com>
To: Felipe Balbi <felipe.balbi@linux.intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>
Cc: Linux USB <linux-usb@vger.kernel.org>,
linux-kernel@vger.kernel.org,
Chunyan Zhang <zhang.chunyan@linaro.org>
Subject: Re: [PATCH] usb: gadget: functions: add ftrace export over USB
Date: Fri, 14 Jul 2017 11:01:35 +0530 [thread overview]
Message-ID: <16a6940d-d071-cd2d-5911-dad427a13cb0@redhat.com> (raw)
In-Reply-To: <20170609061327.17899-1-felipe.balbi@linux.intel.com>
Hi Felipe,
On Friday 09 June 2017 11:43 AM, Felipe Balbi wrote:
> +static void notrace ftrace_write(struct trace_export *ftrace, const void *buf,
> + unsigned int len)
> +{
> + struct usb_ftrace *trace = ftrace_to_trace(ftrace);
> + struct usb_request *req = next_request(&trace->list);
> +
> + if (!req)
> + return;
> +
> + if (!trace->in->enabled)
> + return;
> +
> + req->buf = kmemdup(buf, len, GFP_ATOMIC);
Probably we can avoid the copy of trace data.
We can make write() call of "struct trace_export" as posted. Can have a
write_complete() callback function implemented in struct trace_export,which
can be called from your ftrace_complete().
We need to execute __buffer_unlock_commit() only in write_complete() in case
of ftrace_export is enabled.
> + req->length = len;
> + req->context = trace;
> + req->complete = ftrace_complete;
> + list_move_tail(&req->list, &trace->pending);
> +
> + schedule_work(&trace->queue_work);
> +}
> +
--
Pratyush
next prev parent reply other threads:[~2017-07-14 5:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-09 6:13 [PATCH] usb: gadget: functions: add ftrace export over USB Felipe Balbi
2017-06-09 10:28 ` Felipe Balbi
2017-06-09 11:15 ` Felipe Balbi
2017-07-14 5:52 ` Pratyush Anand
2017-07-14 6:53 ` Felipe Balbi
2017-07-14 21:44 ` Steven Rostedt
2017-06-09 14:02 ` Steven Rostedt
2017-06-09 14:05 ` Felipe Balbi
2017-06-09 15:07 ` Steven Rostedt
2017-06-10 3:38 ` kbuild test robot
2017-06-12 10:39 ` Felipe Balbi
2017-06-10 4:02 ` kbuild test robot
2017-07-13 11:40 ` Felipe Balbi
2017-07-14 5:31 ` Pratyush Anand [this message]
2017-07-14 6:56 ` Felipe Balbi
2019-03-21 9:38 ` Felipe Balbi
2019-03-21 16:37 ` Steven Rostedt
2019-03-22 11:49 ` Felipe Balbi
2019-03-22 12:22 ` Steven Rostedt
2019-03-22 12:27 ` Felipe Balbi
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