From: Wu Fengguang <fengguang.wu@intel.com>
To: Chris Mason <chris.mason@oracle.com>
Cc: linux-fsdevel@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] btrfs: lower the dirty balance poll interval
Date: Thu, 17 Nov 2011 20:24:03 +0800 [thread overview]
Message-ID: <20111117122403.GA32363@localhost> (raw)
Tests show that the original large intervals can easily make the dirty
limit exceeded on 100 concurrent dd's. So adapt to as large as the
next check point selected by the dirty throttling algorithm.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
fs/btrfs/file.c | 2 ++
1 file changed, 2 insertions(+)
--- linux-next.orig/fs/btrfs/file.c 2011-11-17 20:18:51.000000000 +0800
+++ linux-next/fs/btrfs/file.c 2011-11-17 20:18:55.000000000 +0800
@@ -1168,6 +1168,8 @@ static noinline ssize_t __btrfs_buffered
nrptrs = min((iov_iter_count(i) + PAGE_CACHE_SIZE - 1) /
PAGE_CACHE_SIZE, PAGE_CACHE_SIZE /
(sizeof(struct page *)));
+ nrptrs = min(nrptrs, current->nr_dirtied_pause - current->nr_dirtied);
+ nrptrs = max(nrptrs, 8);
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
if (!pages)
return -ENOMEM;
next reply other threads:[~2011-11-17 12:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-17 12:24 Wu Fengguang [this message]
2011-11-21 20:36 ` [PATCH] btrfs: lower the dirty balance poll interval Chris Mason
2011-11-22 2:21 ` Wu Fengguang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20111117122403.GA32363@localhost \
--to=fengguang.wu@intel.com \
--cc=chris.mason@oracle.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).