From: Wu Fengguang <fengguang.wu@intel.com>
To: Trond Myklebust <Trond.Myklebust@netapp.com>, linux-nfs@vger.kernel.org
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jan Kara <jack@suse.cz>, Christoph Hellwig <hch@lst.de>,
Dave Chinner <david@fromorbit.com>,
Greg Thelen <gthelen@google.com>,
Minchan Kim <minchan.kim@gmail.com>,
Vivek Goyal <vgoyal@redhat.com>,
Andrea Righi <arighi@develer.com>, linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH 2/2] nfs: scale writeback threshold proportional to dirty threshold
Date: Tue, 18 Oct 2011 16:53:51 +0800 [thread overview]
Message-ID: <20111018085351.GB27805@localhost> (raw)
In-Reply-To: <20111010131154.GB16847@localhost>
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@intel.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@intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.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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next prev parent reply other threads:[~2011-10-18 8:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-03 13:42 [PATCH 00/11] IO-less dirty throttling v12 Wu Fengguang
2011-10-03 13:42 ` [PATCH 01/11] writeback: account per-bdi accumulated dirtied pages Wu Fengguang
2011-10-03 13:42 ` [PATCH 02/11] writeback: dirty position control Wu Fengguang
2011-10-03 13:42 ` [PATCH 03/11] writeback: add bg_threshold parameter to __bdi_update_bandwidth() Wu Fengguang
2011-10-03 13:42 ` [PATCH 04/11] writeback: dirty rate control Wu Fengguang
2011-10-03 13:42 ` [PATCH 05/11] writeback: stabilize bdi->dirty_ratelimit Wu Fengguang
2011-10-03 13:42 ` [PATCH 06/11] writeback: per task dirty rate limit Wu Fengguang
2011-10-03 13:42 ` [PATCH 07/11] writeback: IO-less balance_dirty_pages() Wu Fengguang
2011-10-03 13:42 ` [PATCH 08/11] writeback: limit max dirty pause time Wu Fengguang
2011-10-03 13:42 ` [PATCH 09/11] writeback: control " Wu Fengguang
2011-10-03 13:42 ` [PATCH 10/11] writeback: dirty position control - bdi reserve area Wu Fengguang
2011-10-03 13:42 ` [PATCH 11/11] writeback: per-bdi background threshold Wu Fengguang
2011-10-03 13:59 ` [PATCH 00/11] IO-less dirty throttling v12 Wu Fengguang
2011-10-05 1:42 ` Wu Fengguang
2011-10-04 19:52 ` Vivek Goyal
2011-10-05 13:56 ` Wu Fengguang
2011-10-05 15:16 ` Andi Kleen
2011-10-10 12:14 ` Peter Zijlstra
2011-10-10 13:07 ` Wu Fengguang
2011-10-10 13:10 ` [RFC][PATCH 1/2] nfs: writeback pages wait queue Wu Fengguang
2011-10-10 13:11 ` [RFC][PATCH 2/2] nfs: scale writeback threshold proportional to dirty threshold Wu Fengguang
2011-10-18 8:53 ` Wu Fengguang [this message]
2011-10-18 8:59 ` Wu Fengguang
2011-10-20 2:49 ` Wu Fengguang
2011-10-18 8:51 ` [RFC][PATCH 1/2] nfs: writeback pages wait queue Wu Fengguang
2011-10-20 3:59 ` Wu Fengguang
2011-10-10 14:28 ` [PATCH 00/11] IO-less dirty throttling v12 Wu Fengguang
2011-10-17 3:03 ` Wu Fengguang
2011-10-20 3:39 ` Wu Fengguang
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