From: Wu Fengguang <fengguang.wu@intel.com>
To: Jan Kara <jack@suse.cz>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Christoph Hellwig <hch@lst.de>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 3/5] writeback: fix dirtied pages accounting on sub-page writes
Date: Tue, 22 Nov 2011 20:30:01 +0800 [thread overview]
Message-ID: <20111122123001.GA16054@localhost> (raw)
In-Reply-To: <20111122122157.GB8058@quack.suse.cz>
> > @@ -1743,6 +1738,8 @@ void account_page_dirtied(struct page *p
> > __inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);
> > task_dirty_inc(current);
> > task_io_account_write(PAGE_CACHE_SIZE);
> > + current->nr_dirtied++;
> > + __get_cpu_var(bdp_ratelimits)++;
> I think you need preempt_disable() and preempt_enable() pair around
> __get_cpu_var(). Otherwise a process could get rescheduled in the middle of
> read-modify-write cycle...
Hmm, I'm not worried about it at all, because bdp_ratelimits don't
need to be accurate. In normal cases it won't even trigger one single
call to balance_dirty_pages().
btw, account_page_dirtied() is called inside spinlock, will it be
sufficient?
Thanks,
Fengguang
next prev parent reply other threads:[~2011-11-22 12:30 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-21 13:03 [PATCH 0/5] dirty throttling bits for 3.3 Wu Fengguang
2011-11-21 13:03 ` [PATCH 1/5] writeback: balanced_rate cannot exceed write bandwidth Wu Fengguang
2011-11-21 22:50 ` Jan Kara
2011-11-22 6:41 ` Wu Fengguang
2011-11-22 21:04 ` Jan Kara
2011-11-23 13:17 ` Wu Fengguang
2011-11-21 13:03 ` [PATCH 2/5] writeback: charge leaked page dirties to active tasks Wu Fengguang
2011-11-21 21:49 ` Andrew Morton
2011-11-21 23:46 ` Jan Kara
2011-11-22 13:35 ` Wu Fengguang
2011-11-21 13:03 ` [PATCH 3/5] writeback: fix dirtied pages accounting on sub-page writes Wu Fengguang
2011-11-22 0:11 ` Jan Kara
2011-11-22 9:21 ` Wu Fengguang
2011-11-22 12:21 ` Jan Kara
2011-11-22 12:30 ` Wu Fengguang [this message]
2011-11-22 12:48 ` Jan Kara
2011-11-22 13:02 ` Wu Fengguang
2011-11-22 12:57 ` Peter Zijlstra
2011-11-22 13:07 ` Wu Fengguang
2011-11-22 13:41 ` Wu Fengguang
2011-11-22 13:53 ` Peter Zijlstra
2011-11-22 14:11 ` Wu Fengguang
2011-11-28 13:51 ` Wu Fengguang
2011-11-21 13:03 ` [PATCH 4/5] writeback: fix dirtied pages accounting on redirty Wu Fengguang
2011-11-21 21:51 ` Andrew Morton
2011-11-22 13:59 ` Wu Fengguang
2011-11-21 13:03 ` [PATCH 5/5] writeback: dirty ratelimit - think time compensation Wu Fengguang
2011-11-23 12:44 ` [PATCH 0/5] dirty throttling bits for 3.3 Peter Zijlstra
2011-11-28 13:56 ` Wu Fengguang
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