From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12224] journal activity on inactive partition causes inactive harddrive spinup
Date: Thu, 18 Dec 2008 15:02:51 -0800 (PST)
Message-ID: <20081218230251.8C3C011D108@picon.linux-foundation.org>
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------- Comment #12 from sandeen@redhat.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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