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Re: requeue_pi support
- From: Dinakar Guniguntala <dino at in dot ibm dot com>
- To: Ulrich Drepper <drepper at redhat dot com>
- Cc: Darren Hart <dvhltc at us dot ibm dot com>, Thomas Gleixner <tglx at linutronix dot de>, libc-alpha <libc-alpha at sourceware dot org>
- Date: Wed, 22 Jul 2009 02:10:02 +0530
- Subject: Re: requeue_pi support
- References: <4A63ECB9.9020808@redhat.com>
- Reply-to: dino at in dot ibm dot com
On Sun, Jul 19, 2009 at 09:04:09PM -0700, Ulrich Drepper wrote:
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> I added now the requeue_pi support for x86-64. The patch was really not
cool
> usable, I rewrote most of it. Did you actually test your code? The
I see that you added quite a few changes to the pthread_cond calls in the
last few days
> FUTEX_WAIT_REQUEUE_PI calls requires an absolute timeout. This is not
My bad, I did miss that, looking closer, my 'c' tests didnt have any
pthread_cond_timedwait tests it looks like
> what your code did.
>
> I changed a lot of things in these functions before this change. So
> your patch would apply either.
I do see that the bulk of my code has been retained, except the changes for
pthread_cond_timedwait and the tiny optimizations I had for switching
between futex OP codes, no ??
>
> I haven't tested the new code path. I did make sure that the code works
> on older kernels. Once a new kernel is available but you can do this as
> well.
Built and tested the latest glibc git with the prio-wake testcase
(Part of the LTP realtime testcases that fails sometimes on SMP without
requeue-PI support)
1. 2.6.29.5 - APIs not implemented in kernel, testcase fails sometimes as
expected. (ENOSYS for requeue APIs and fails sometimes on
SMP as expected)
2. 2.6.29.5-rt22 - APIs implemented in kernel, testcase passes in a 2 hour run
3. 2.6.31-rc3 - APIs implemented in kernel, testcase passes in a 2 hour run
Needs more testing of the error paths etc
-Dinakar
>
> - --
> â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â
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