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Message-ID: <20181015150932.29520.2252.stgit@localhost.localdomain>
Date: Mon, 15 Oct 2018 08:09:32 -0700
From: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Cc: len.brown@...el.com, rafael@...nel.org, linux-pm@...r.kernel.org,
jiangshanlai@...il.com, pavel@....cz, zwisler@...nel.org,
tj@...nel.org, akpm@...ux-foundation.org,
alexander.h.duyck@...ux.intel.com
Subject: [driver-core PATCH v4 5/6] driver core: Attach devices on CPU local
to device node
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 <alexander.h.duyck@...ux.intel.com>
---
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 c33f893ec9d8..65cfdd2b00ed 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -827,7 +827,7 @@ 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);
}
@@ -984,7 +984,7 @@ 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;
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