linux-kernel - Re: [RFC][PATCH 2/2] nfs: scale writeback threshold proportional to dirty threshold

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Date:	Tue, 18 Oct 2011 16:53:51 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 2/2] nfs: scale writeback threshold proportional
 to dirty threshold

An update from Feng:

Subject: nfs: fix a bug about adjusting nfs_congestion_kb
Date: Tue Oct 18 12:47:58 CST 2011

From: "Tang, Feng" <feng.tang@...el.com>

The VM dirty_thresh may be set to very small(even 0) by wired user, in
such case, nfs_congestion_kb may be adjusted to 0, will cause the normal
NFS write function get congested and deaklocked. So let's set the bottom
line of nfs_congestion_kb to 128kb.

Signed-off-by: Feng Tang <feng.tang@...el.com>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
 fs/nfs/write.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-next.orig/fs/nfs/write.c	2011-10-17 16:07:40.000000000 +0800
+++ linux-next/fs/nfs/write.c	2011-10-18 12:47:46.000000000 +0800
@@ -1814,6 +1814,7 @@ void nfs_update_congestion_thresh(void)
 	 */
 	global_dirty_limits(&background_thresh, &dirty_thresh);
 	dirty_thresh <<= PAGE_SHIFT - 10;
+	dirty_thresh += 1024;
 
 	if (nfs_congestion_kb > dirty_thresh / 8)
 		nfs_congestion_kb = dirty_thresh / 8;
--
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