linux-kernel - [PATCH V7 03/18] blk-throttle: add configure option for new .low interface

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Date:   Mon, 27 Mar 2017 10:51:31 -0700
From:   Shaohua Li <shli@...com>
To:     <linux-kernel@...r.kernel.org>, <linux-block@...r.kernel.org>
CC:     <axboe@...nel.dk>, <tj@...nel.org>,
        Vivek Goyal <vgoyal@...hat.com>, <jmoyer@...hat.com>,
        <Kernel-team@...com>
Subject: [PATCH V7 03/18] blk-throttle: add configure option for new .low interface

As discussed in LSF, add configure option for the interface and mark it
as experimental, so people can try/test.

Signed-off-by: Shaohua Li <shli@...com>
---
 block/Kconfig | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/block/Kconfig b/block/Kconfig
index e9f780f..89cd28f 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -115,6 +115,18 @@ config BLK_DEV_THROTTLING
 
 	See Documentation/cgroups/blkio-controller.txt for more information.
 
+config BLK_DEV_THROTTLING_LOW
+	bool "Block throttling .low limit interface support (EXPERIMENTAL)"
+	depends on BLK_DEV_THROTTLING
+	default n
+	---help---
+	Add .low limit interface for block throttling. The low limit is a best
+	effort limit to prioritize cgroups. Depending on the setting, the limit
+	can be used to protect cgroups in terms of bandwidth/iops and better
+	utilize disk resource.
+
+	Note, this is an experimental interface and could be changed someday.
+
 config BLK_CMDLINE_PARSER
 	bool "Block device command line partition parser"
 	default n
-- 
2.9.3