linux-kernel - [PATCH v2 05/16] block: Documentation: add sysfs ABI for expedite_dmpg and expedite

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Date:	Thu, 3 May 2012 19:53:04 +0530
From:	Venkatraman S <svenkatr@...com>
To:	<linux-mmc@...r.kernel.org>, <cjb@...top.org>,
	<linux-mm@...ck.org>, <linux-fsdevel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <arnd.bergmann@...aro.org>,
	<alex.lemberg@...disk.com>, <ilan.smith@...disk.com>,
	<lporzio@...ron.com>, <rmk+kernel@....linux.org.uk>,
	Venkatraman S <svenkatr@...com>
Subject: [PATCH v2 05/16] block: Documentation: add sysfs ABI for expedite_dmpg and expedite_swapin

Add description on the usage of expedite_dmpg and
expedite_swapin.

Signed-off-by: Venkatraman S <svenkatr@...com>
---
 Documentation/ABI/testing/sysfs-block |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block
index c1eb41c..0fb9fef 100644
--- a/Documentation/ABI/testing/sysfs-block
+++ b/Documentation/ABI/testing/sysfs-block
@@ -206,3 +206,15 @@ Description:
 		when a discarded area is read the discard_zeroes_data
 		parameter will be set to one. Otherwise it will be 0 and
 		the result of reading a discarded area is undefined.
+
+What:		/sys/block/<disk>/queue/expedite_demandpaging
+What:		/sys/block/<disk>/queue/expedite_swapin
+Date:		April 2012
+Contact:	Venkatraman S <svenkatr@...com>
+Description:
+		For latency improvements, some storage devices could
+		provide a mechanism for servicing demand paging and
+		swapin requests in a high priority manner. Setting
+		these flags to 1 would get the requests marked with
+		REQ_RW_DMPG or REQ_RW_SWAPIN to be moved to the front
+		of elevator queue.
-- 
1.7.10.rc2

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