On Fri, Jan 16, 2015 at 03:33:09PM -0800, Dmitry Torokhov wrote: > This series is a combination of changes proposed by Luis a couple months > ago and implementation used by Chrome OS. The issue we are trying to solve > here is "slow" devices and drivers spending "too much time" in their probe() > methods and it affects: > > - overall kernel boot process when drivers are compiled into the kernel > and slow devices stall entire boot progress; > - systemd desire to time out module loading process. > > Unlike Luis' proposal we do make use of asycn_schedule() infrastructure > instead of using a dedicated workqueue, so all existing synchronization > points in kernel that wait for device registration still work the same. > Also, the asynchronous probing is done not only during driver registration > (i.e. when devices are probed asynchronously only if they are registered > before the driver), but also during device registration and deferred probe > handling. This way slow devices do not stall kernel boot even when drivers > are compiled into the kernel. > > The last patch is for adventurous people to try and force > fully-asynchronous boot. It works for me with limited success - I can boot > Rockhip-based box to userspace as long as I force serial to be sychronously > probed and ignore the fact that most devices are using "dummy" regulators > as regulator subsystem really expects regulators to be registered in > orderly fashion on OF-based systems. > > Thanks, > Dmitry > > > Dmitry Torokhov (3): > driver-core: add asynchronous probing support for drivers > driver-core: platform_driver_probe() must probe synchronously > module: add core_param_unsafe > > Luis R. Rodriguez (5): > module: add extra argument for parse_params() callback > driver-core: add driver module asynchronous probe support > driver-core: enable drivers to opt-out of async probe > amd64_edac: enforce synchronous probe > driver-core: allow forcing async probing for modules and builtins > > Documentation/kernel-parameters.txt | 13 +++ > arch/powerpc/mm/hugetlbpage.c | 4 +- > drivers/base/base.h | 1 + > drivers/base/bus.c | 31 +++++-- > drivers/base/dd.c | 166 > +++++++++++++++++++++++++++++++----- > drivers/base/platform.c | 13 +++ > drivers/edac/amd64_edac.c | 1 + > include/linux/device.h | 26 ++++++ > include/linux/module.h | 2 + > include/linux/moduleparam.h | 12 ++- > init/main.c | 25 +++--- > kernel/module.c | 25 +++++- > kernel/params.c | 11 ++- > lib/dynamic_debug.c | 4 +- > 14 files changed, 284 insertions(+), 50 deletions(-) > > -- > 2.2.0.rc0.207.ga3a616c >
*ping* -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
