linux-kernel - [PATCH 48/49] jbd2: Use round-jiffies() function for the "5 second" ext4/jbd2 wakeup

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Date:	Mon, 21 Jan 2008 22:02:27 -0500
From:	"Theodore Ts'o" <tytso@....EDU>
To:	linux-kernel@...r.kernel.org
Cc:	Mingming Cao <cmm@...ibm.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Andrew Morton <akpm@...l.org>, "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 48/49] jbd2: Use round-jiffies() function for the "5 second" ext4/jbd2 wakeup

From: Mingming Cao <cmm@...ibm.com>

While "every 5 seconds" doesn't sound as a problem, there can be many
of these (and these timers do add up over all the kernel).  The "5
second" wakeup isn't really timing sensitive; in addition even with
rounding it'll still happen every 5 seconds (with the exception of the
very first time, which is likely to be rounded up to somewhere closer
to 6 seconds)

(Ported from similar JBD patch made by Arjan van de Ven to
fs/jbd/transaction.c)

Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Andrew Morton <akpm@...l.org>
Signed-off-by: Mingming Cao <cmm@...ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
 fs/jbd2/transaction.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 70b3199..0c8adab 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -54,7 +54,7 @@ jbd2_get_transaction(journal_t *journal, transaction_t *transaction)
 	spin_lock_init(&transaction->t_handle_lock);
 
 	/* Set up the commit timer for the new transaction. */
-	journal->j_commit_timer.expires = transaction->t_expires;
+	journal->j_commit_timer.expires = round_jiffies(transaction->t_expires);
 	add_timer(&journal->j_commit_timer);
 
 	J_ASSERT(journal->j_running_transaction == NULL);
-- 
1.5.4.rc3.31.g1271-dirty

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