linux-ext4 - [Bug 12224] journal activity on inactive partition causes inactive harddrive spinup

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Message-Id: <20081218230251.8C3C011D108@picon.linux-foundation.org>
Date:	Thu, 18 Dec 2008 15:02:51 -0800 (PST)
From:	bugme-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 12224] journal activity on inactive partition causes inactive harddrive spinup

http://bugzilla.kernel.org/show_bug.cgi?id=12224





------- Comment #12 from sandeen@...hat.com  2008-12-18 15:02 -------
In a nutshell, with laptop mode on, we go down this path:

static void laptop_timer_fn(unsigned long unused)
{
        pdflush_operation(laptop_flush, 0);
}

static void laptop_flush(unsigned long unused)
{
        sys_sync();
}

which gets us to the new 

static int ext3_sync_fs(struct super_block *sb, int wait)
{
        sb->s_dirt = 0;
        if (wait)
                ext3_force_commit(sb);
...

which is then committing empty transactions.  Seems like we should be smart
enough to skip committing transactions w/ nothing in them...?


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