From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Duyck Subject: [driver-core PATCH v3 4/5] driver core: Attach devices on CPU local to device node Date: Thu, 11 Oct 2018 15:09:38 -0700 Message-ID: <20181011220938.1408.87333.stgit@localhost.localdomain> References: <20181011220134.1408.63391.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20181011220134.1408.63391.stgit@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org Cc: len.brown@intel.com, rafael@kernel.org, linux-pm@vger.kernel.org, jiangshanlai@gmail.com, pavel@ucw.cz, zwisler@kernel.org, tj@kernel.org, akpm@linux-foundation.org, alexander.h.duyck@linux.intel.com List-Id: linux-pm@vger.kernel.org This change makes it so that we call the asynchronous probe routines on a CPU local to the device node. By doing this we should be able to improve our initialization time significantly as we can avoid having to access the device from a remote node which may introduce higher latency. For example, in the case of initializing memory for NVDIMM this can have a singifcant impact as initialing 3TB on remote node can take up to 39 seconds while initialing it on a local node only takes 23 seconds. It is situations like this where we will see the biggest improvement. Signed-off-by: Alexander Duyck --- drivers/base/dd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 5ba366c1cb83..81472dc44a70 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -826,7 +826,7 @@ static int __device_attach(struct device *dev, bool allow_async) */ dev_dbg(dev, "scheduling asynchronous probe\n"); get_device(dev); - async_schedule(__device_attach_async_helper, dev); + async_schedule_dev(__device_attach_async_helper, dev); } else { pm_request_idle(dev); } @@ -927,7 +927,7 @@ static int __driver_attach(struct device *dev, void *data) if (!dev->driver) { get_device(dev); dev_set_drvdata(dev, drv); - async_schedule(__driver_attach_async_helper, dev); + async_schedule_dev(__driver_attach_async_helper, dev); } device_unlock(dev); return 0;