linux-kernel - [PATCH 0/3] ACPI / debugger: Add kernel flushing support

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Date:	Thu, 14 Jul 2016 10:52:01 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: [PATCH 0/3] ACPI / debugger: Add kernel flushing support

AML debugger is implemented in the kernel as a character device located in
the debugfs. Currently, when its batch mode is used, the userspace tool
needs to flush the logs/prompts remained in the kernel output buffer, this
is implemented in an inefficient way in the userspace by polling the IO and
reading everything out.

This patch introduces a kernel space flushing support, so that userspace
can invoke fsync() to put the driver into a state waiting for new commands,
all kernel space logs/prompts will be automatically discarded by fsync().

Lv Zheng (3):
  debugfs: Add .fsync() callback proxy support
  ACPI / debugger: Add kernel flushing support
  tools/power/acpi/acpidbg: Use new flushing mechanism

 drivers/acpi/acpi_dbg.c                  |   94 ++++++++++++++++++++++++++++--
 fs/debugfs/file.c                        |    6 ++
 tools/power/acpi/tools/acpidbg/acpidbg.c |   49 ++--------------
 3 files changed, 101 insertions(+), 48 deletions(-)

-- 
1.7.10