From: Frank Rowand <frank.rowand@am.sony.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: <linux-rt-users@vger.kernel.org>
Subject: spin locks and migrate_disable()
Date: Fri, 30 Mar 2012 14:57:45 -0700 [thread overview]
Message-ID: <4F762C59.4050008@am.sony.com> (raw)
Hi Thomas,
Two questions about spin_lock() in include/linux/spinlock_rt.h.
(1) spin_lock() and related functions invoke migrate_disable() and
migrate_enable(). These functions are created by your patch,
sched-migrate-disable.patch, and are EXPORT_SYMBOL_GPL(). Would
you be willing to change these to EXPORT_SYMBOL()?
(2) What is the purpose of the migrate_disable() in the spin lock?
Is it a correctness issue, or a performance issue, or something else?
Thanks!
-Frank
next reply other threads:[~2012-03-30 21:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-30 21:57 Frank Rowand [this message]
2012-04-13 7:52 ` spin locks and migrate_disable() Thomas Gleixner
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