From: Manfred Spraul <manfred@colorfullife.com>
To: LKML <linux-kernel@vger.kernel.org>, Andrew Morton <akpm@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Mike Galbraith <efault@gmx.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Manfred Spraul <manfred@colorfullife.com>
Subject: [PATCH 0/5] ipc/sem.c: multiple fixes
Date: Sat, 15 Oct 2011 15:21:19 +0200 [thread overview]
Message-ID: <1318684879-1887-1-git-send-email-manfred@colorfullife.com> (raw)
Hi all,
The wakeup scheme used by semtimedop() does not work as intended on -rt.
The following series:
- fixes one bug that I noticed while thinking about a -rt compatible
implementation
- prevents the code from returning to user space due to spurious wakeups.
(noticed by Peter Zijlstra)
- moves private structures from include/linux/sem.h to ipc/sem.c
- saves some memory if sysvipc is disabled.
- reworks the wakeup scheme and adds a 2nd wakeup scheme that is based
on a completion. For CONFIG_PREEMPT_RT_BASE, this scheme is used.
What do you think?
The rework of the wakeup should also help to convert the code to
using the wake_up_list framework.
Andrew: Could you replace the patches in -mm with this series?
I would prefer to keep the current scheme as the default, it's
~5% faster (6.5 usec vs. 6.8 usec per wakeup).
The patches pass checkpatch.pl and I didn't observe any problems
with my test apps.
--
Manfred
next reply other threads:[~2011-10-15 13:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-15 13:21 Manfred Spraul [this message]
2011-10-17 12:43 ` Peter Zijlstra
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