+ init-reduce-rootwait-polling-interval-time-to-5ms.patch added to -mm tree

+ init-reduce-rootwait-polling-interval-time-to-5ms.patch added to -mm tree

[akpm]

The patch titled
     Subject: init: reduce rootwait polling interval time to 5ms
has been added to the -mm tree.  Its filename is
     init-reduce-rootwait-polling-interval-time-to-5ms.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/init-reduce-rootwait-polling-interval-time-to-5ms.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/init-reduce-rootwait-polling-interval-time-to-5ms.patch

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------------------------------------------------------
From: Jungseung Lee <js07.lee@samsung.com>
Subject: init: reduce rootwait polling interval time to 5ms

For several devices, the rootwait time is sensitive because it directly
affects booting time.  The polling interval of rootwait is currently
100ms.  To save unnessesary waiting time, reduce the polling interval to 5
ms.

Link: http://lkml.kernel.org/r/20161207060743.1728-1-js07.lee@samsung.com
Signed-off-by: Jungseung Lee <js07.lee@samsung.com>
Cc: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 init/do_mounts.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -puN init/do_mounts.c~init-reduce-rootwait-polling-interval-time-to-5ms init/do_mounts.c
--- a/init/do_mounts.c~init-reduce-rootwait-polling-interval-time-to-5ms
+++ a/init/do_mounts.c
@@ -543,6 +543,8 @@ void __init mount_root(void)
 #endif
 }
 
+#define ROOTWAIT_MSEC 5
+
 /*
  * Prepare the namespace - decide what/where to mount, load ramdisks, etc.
  */
@@ -588,7 +590,7 @@ void __init prepare_namespace(void)
 			saved_root_name);
 		while (driver_probe_done() != 0 ||
 			(ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
-			msleep(100);
+			msleep(ROOTWAIT_MSEC);
 		async_synchronize_full();
 	}
 
_

Patches currently in -mm which might be from js07.lee@samsung.com are

init-reduce-rootwait-polling-interval-time-to-5ms.patch