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
