on 03/06/2011 20:57 Robert N. M. Watson said the following:
On 3 Jun 2011, at 16:13, Andriy Gapon wrote:
I wonder if anybody uses kdb_stop_cpus with non-default value. If, yes, I
am very interested to learn about your usecase for it.
The issue that prompted the sysctl was non-NMI IPIs
disabled
and is spinning, since the IPI won't be received and the KDB will wait
indefinitely. We probably need to add a timeout, but this is a useful
stopgap in the mean time.
But that was before we started using hard stop in this context (in 2009).
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on 03/06/2011 18:28 Nathan Whitehorn said the following:
On 06/03/11 10:13, Andriy Gapon wrote:
I wonder if anybody uses kdb_stop_cpus with non-default value.
If, yes, I am very interested to learn about your usecase for it.
I think that the default kdb behavior is the correct one, so
on 29/05/2011 06:06 Attilio Rao said the following:
2011/5/28 Attilio Rao atti...@freebsd.org:
2011/5/25 Andriy Gapon a...@freebsd.org:
The patch is here:
http://people.freebsd.org/~avg/cpu-offline-sysctl.diff
It should implement the strategy described above.
I don't see the point
on 31/05/2011 16:34 Attilio Rao said the following:
2011/5/31 Andriy Gapon a...@freebsd.org:
on 29/05/2011 06:06 Attilio Rao said the following:
2011/5/28 Attilio Rao atti...@freebsd.org:
2011/5/25 Andriy Gapon a...@freebsd.org:
The patch is here:
http://people.freebsd.org/~avg/cpu-offline
.txt
As you can see, in the failing case ZFS tries to attach to ada[0123]
whereas in the succeeding case ZFS attaches to ada[0123]p3 (which are the
correct devices)
Maybe try to enable GEOM debug to see if/when tasting of the GPT partitions
occurs.
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and don't have to manually install the OS.
There is no sysinstall :-) [in the latest CURRENT]
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, for my future tests, I would like to get some pointers on getting started
with NFSv4 in FreeBSD.
Thanks!
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this module (I have
MODULES_OVERRIDE), so no problem here.
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and statd?
Do I still need them with newnfs and NFSv3 to get fcntl/flock working?
And do those actually work? :-)
I understand that with NFSv4 I don't need those anymore.
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wrong about the day he does it.
And a classic cross-build won't help with setting i586 or lower that he needs:
i586, pentium
Intel Pentium CPU with no MMX support.
Just my 2 cents.
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on 23/05/2011 19:28 Andriy Gapon said the following:
I propose the following path for moving forward.
- use hint.lapic.X.disabled to disable individual CPUs by their APIC ID
- use machdep.hyperthreading_allowed tunable to disable second logical CPU on
each
real core
The above should
in the environment of his build shell within the jail.
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on 19/05/2011 19:58 Andriy Gapon said the following:
on 18/05/2011 20:04 Attilio Rao said the following:
2011/5/18 Garrett Cooper yaneg...@gmail.com:
We use this internally at work still with a software config that uses 4BSD
so
as long as there is an equivalent tunable, that's good enough
a patch to the tree, but it doesn't seem so...
anyway, yes, I think that adding tunables for this is very reasonable and not
as dangerous as the current mechanism.
I agree.
I haven't sent a patch, because I don't have it yet :)
I decided to solicit opinions before getting to hacking code.
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on 17/05/2011 10:19 Andriy Gapon said the following:
So I am going to commit this.
If it breaks anything for anyone and the problem would not be really trivial,
the I'll just revert the change.
r222051.
Please take this commit in consideration if you run into any USB-related
problems
with the media you tried with any other drive?
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size block-len state done remaining%
done
0 1048576 243052544 0 0 243052544
0.0
0 1048576 failed (Device not configured)
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Once we grow correct code for offlining CPUs, then we could re-introduce the
sysctls without any problems.
While the offlining code doesn't seem terribly hard to develop, it's a big piece
of work and requires time and effort.
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on 16/05/2011 23:09 John Baldwin said the following:
On Monday, May 16, 2011 3:27:47 pm Andriy Gapon wrote:
on 16/05/2011 21:21 John Baldwin said the following:
How about this:
...
/*
* Shared mutex to restrict busywaits between smp_rendezvous() and
@@ -311,39 +312,62 @@ restart_cpus
on 17/05/2011 14:56 John Baldwin said the following:
On 5/17/11 4:03 AM, Andriy Gapon wrote:
Couldn't [Shouldn't] the whole:
/* Ensure we have up-to-date values. */
atomic_add_acq_int(smp_rv_waiters[0], 1);
while (smp_rv_waiters[0] smp_rv_ncpus)
cpu_spinwait
; \
mips_sync();\
return (v); \
} \
I should have checked this myself.
Thank you for patiently explaining these things to me.
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on 17/05/2011 18:51 John Baldwin said the following:
On Tuesday, May 17, 2011 10:34:41 am Andriy Gapon wrote:
on 17/05/2011 16:58 John Baldwin said the following:
No, it doesn't quite work that way. It wouldn't work on Alpha for example.
All load_acq is a load with a memory barrier to order
cpu_spinwait() loop is really needed and, by extension, that the assignments
should be moved behind it.
Please :)
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on 14/05/2011 18:25 John Baldwin said the following:
On 5/13/11 9:43 AM, Andriy Gapon wrote:
This is a change in vein of what I've been doing in the xcpu branch and it's
supposed to fix the issue by the recent commit that (probably
unintentionally)
stress-tests smp_rendezvous in TSC code
on smp_rv_waiters[2]? It's always only master
CPU (and under smp_ipi_mtx).
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on 15/05/2011 07:33 Max Laier said the following:
On Saturday 14 May 2011 11:25:36 John Baldwin wrote:
On 5/13/11 9:43 AM, Andriy Gapon wrote:
This is a change in vein of what I've been doing in the xcpu branch and
it's supposed to fix the issue by the recent commit that (probably
on 15/05/2011 10:12 Andriy Gapon said the following:
on 14/05/2011 18:25 John Baldwin said the following:
Hmmm, so this is not actually sufficient. NetApp ran into a very similar
race
with virtual CPUs in BHyVe. In their case because virtual CPUs are threads
that
can be preempted
that I prefer it :-)
I just wanted to show and explain it as apparently there was some
misunderstanding about it. I think that generation count approach could even
have a little bit better performance while perhaps being a tiny bit less
obvious.
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on 15/05/2011 18:16 John Baldwin said the following:
On 5/15/11 10:53 AM, Andriy Gapon wrote:
on 15/05/2011 10:12 Andriy Gapon said the following:
on 14/05/2011 18:25 John Baldwin said the following:
Hmmm, so this is not actually sufficient. NetApp ran into a very similar
race
with virtual
]) ncpus)
+ while (atomic_load_acq_int(smp_rv_waiters[1]) ncpus)
cpu_spinwait();
/* release lock */
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on 13/05/2011 17:41 Max Laier said the following:
this ncpus isn't the one you are looking for.
Thank you!
Here's an updated patch:
Index: sys/kern/subr_smp.c
===
--- sys/kern/subr_smp.c (revision 221835)
+++ sys/kern/subr_smp.c
on 13/05/2011 18:50 Max Laier said the following:
On Friday 13 May 2011 11:28:33 Andriy Gapon wrote:
on 13/05/2011 17:41 Max Laier said the following:
this ncpus isn't the one you are looking for.
Thank you!
Here's an updated patch:
Can you attach the patch, so I can apply it locally
at the start should trigger the synchronization only when it is really
required.
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by pjd. The only minor drawback is very
small code duplication.
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of timecounter?
For the latter indeed there is no tunable, which is a small annoyance.
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on 09/05/2011 16:35 John Baldwin said the following:
On Saturday, May 07, 2011 5:37:26 am Andriy Gapon wrote:
I believe that the following change is needed to fix COUNT_IPIS option.
Right now it seems to be a noop.
mp_ipi_intrcnt: CPU_FOREACH can't be used this early
... because
.
The code in systm.h appears to be a slightly less optimized version of the
algorithm presented in SWAR or Hacker's Delight.
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);
intrcnt_add(buf, ipi_invltlb_counts[i]);
snprintf(buf, sizeof(buf), cpu%d:invlrng, i);
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;
- smp_rendezvous_cpus(map, dtrace_gethrtime_init_sync,
+ smp_rendezvous_cpus(map, NULL,
dtrace_gethrtime_init_cpu,
smp_no_rendevous_barrier, (void *)(uintptr_t) i);
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)0x)\
- * - (((x)3)0x))
+ * Population count algorithm using SWAR approach
+ * - SIMD Within A Register.
*/
static __inline uint32_t
bitcount32(uint32_t x)
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on 07/05/2011 23:22 Stefan Bethke said the following:
Am 07.05.2011 um 12:47 schrieb Kostik Belousov:
On Sat, May 07, 2011 at 12:58:11PM +0300, Andriy Gapon wrote:
I think that the SWAR reference should be more concise and should lead an
interested reader to more information on the topic
the right thing:
fd = open(/dev/dsp, O_RDWR);
mmap(PROT_READ, fd);
mmap(PROT_WRITE, fd);
Thank you!
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on 06/05/2011 16:32 Kostik Belousov said the following:
On Fri, May 06, 2011 at 11:55:00AM +0300, Andriy Gapon wrote:
I would like to ask for a review and/or testing of the following patch:
http://people.freebsd.org/~avg/dev_dsp_mmap.diff
It's supposed to fix an issue described here:
http
on 06/05/2011 16:38 Andriy Gapon said the following:
on 06/05/2011 16:32 Kostik Belousov said the following:
Your patch hardcodes an assumption that sndbufs are always
contiguous. I was unable to convince myself that this is true.
I think that this should be true for the case when DMA
on 06/05/2011 16:00 John Baldwin said the following:
On Friday, May 06, 2011 4:55:00 am Andriy Gapon wrote:
I would like to ask for a review and/or testing of the following patch:
http://people.freebsd.org/~avg/dev_dsp_mmap.diff
It's supposed to fix an issue described here:
http
).
How it looks like:
http://paste.org.ru/?5exeve
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...@freebsd.org
Date: Tue, 26 Apr 2011 19:50:02 +0300
From: Andriy Gapon a...@freebsd.org
To: multime...@freebsd.org
Subject: SNDCTL_DSP_GETIPTR implementation
Guys,
I reading this http://manuals.opensound.com/developer/SNDCTL_DSP_GETOPTR.html
It says: In mmap mode (only) the ptr field tells the location
or ACPI-fast. I thought that the whole
point was in automatically choosing the best timecounter. I would go the
opposite way - if automatic selection of TSC causes any trouble then provide a
way to disable it.
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] define TZ object.
The hardware is likely to be there for any reasonably modern Dell desktop. Do
you have coretemp loaded?
I think that coretemp works directly with CPU and is not related to the problem
at hand.
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this kludge and updating the comment to state this
fact would be sufficient to solve the problem.
I don't see how this follows from what you've written above.
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that the legacy method will keep working with Bulldozer, but I am
not
completely sure. Anyway, I hope to find some time to improve our topology
detection code so that it doesn't assume uniformity and also takes into account
cache topology. And then this change will be more useful.
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to be familiar with assembly and know basic behavior of BIOS booting
(supposing we talk about x86) and FreeBSD boot blocks, e.g. what is loaded at
what address.
Here's an example of something related:
http://lists.freebsd.org/pipermail/freebsd-fs/2010-May/008580.html
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on 08/04/2011 08:51 Andriy Gapon said the following:
on 07/04/2011 13:59 Alexander Motin said the following:
Any objections? Or SCSI/IDE there expected to mean command set?
Sorry for saying something potentially stupid, but... do we actually have any
reason to make that distinction from any
*/
+ movqTF_RSP(%rsp),%r9/* user stack pointer */
+ movq%r9,%rsp/* original %rsp */
+ swapgs
+ sysretq
+3: /* Requested full context restore, use doreti for that. */
MEXITCOUNT
jmp doreti
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);
}
+ if (tsc_is_invariant)
+ tsc_timecounter.tc_quality = 1200;
+
#ifdef SMP
/*
* We can not use the TSC in SMP mode unless the TSCs on all CPUs
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are started properly.
Great! Thank you for the info and your work.
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on 07/04/2011 13:59 Alexander Motin said the following:
Any objections? Or SCSI/IDE there expected to mean command set?
Sorry for saying something potentially stupid, but... do we actually have any
reason to make that distinction from any practical point?
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patch to cover all USB drivers using use_generic.
Which drivers I have missed?
Thanks!
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on 06/04/2011 16:28 Hans Petter Selasky said the following:
On Wednesday 06 April 2011 15:21:19 Andriy Gapon wrote:
on 06/04/2011 10:33 Hans Petter Selasky said the following:
Which drivers I have missed?
Thanks!
Run a kernel test compile including all modules. If that's OK it should
on 03/04/2011 13:46 Andriy Gapon said the following:
Mostly out of curiosity (but not only because of that) I wonder why the
use_generic flag and two probing passes are needed in USB driver probing code.
That is, why the standard approach of using different probing return values
(e.g
on 05/04/2011 14:21 Hans Petter Selasky said the following:
On Tuesday 05 April 2011 13:06:22 Andriy Gapon wrote:
on 03/04/2011 13:46 Andriy Gapon said the following:
Mostly out of curiosity (but not only because of that) I wonder why the
use_generic flag and two probing passes are needed
on 05/04/2011 15:55 Hans Petter Selasky said the following:
On Tuesday 05 April 2011 14:50:43 Andriy Gapon wrote:
I believe that newbus already supports ordering of children on a bus.
BTW, does USB have to pass anything from probe to attach?
Mostly only the driver info field. To avoid
allproc_lock and new process lock
are unlocked before sched_fork() is called, where new thread td_lock
is initialized. Only PRS_NEW process status is on sentry but not
checked in schedcpu().
How recent is your current?
This sounds like something that could have been recently fixed.
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suggested were more for the next step than for now.
Thank you for the work!
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they could help you.
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of the other
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-23-buildkernel.log
FreeBSD 9.0-CURRENT FreeBSD 9.0-CURRENT #0 r219710M
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on 23/03/2011 13:55 Andriy Gapon said the following:
on 23/03/2011 12:23 Anton Yuzhaninov said the following:
On this page:
http://wiki.freebsd.org/DTrace
written, that for 9-current is sufficient to rebild kernel with this
options:
options DDB_CTF
options KDTRACE_HOOKS
for
kernel builds.
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?
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M4400.
The OID in question should be provided by cpufreq driver.
You should be looking at dmesg and other kernel-related things to find out what
changed on that level.
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=pthread_setaffinity_npapropos=0sektion=0manpath=FreeBSD+8.2-RELEASEformat=html
And the actual functions that should be used on modern FreeBSD are
cpuset_setaffinity and cpuset_getaffinity.
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based on his observations and testing.
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uses ACPI interface to do its work. Hardcoded MSR tables are only
the last resort mechanism, and indeed those support only a handful of models.
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resulted in some signals being lost
sometimes, in particular SIGCHLD.
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the holidays. Unless someone else beats me to it.
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on 21/12/2010 11:27 Artem Belevich said the following:
On Tue, Dec 21, 2010 at 1:26 AM, Artem Belevich fbsdl...@src.cx wrote:
On Mon, Dec 20, 2010 at 3:15 AM, Andriy Gapon a...@freebsd.org wrote:
It would be nice to get the i386 counterpart too when this goes into the
tree.
Here's updated
VirtualBox later, but for now the patch is for 8-STABLE/amd64 only.
It would be nice to get the i386 counterpart too when this goes into the tree.
Thanks!
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).
It's a possible geom or ad driver problem.
What is your geom topology on this system?
Changing cc: from fs@ to g...@.
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an architectural path going forward.
So, I don't think that I propose a dramatic change.
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on 06/12/2010 20:01 John Baldwin said the following:
Hmm, I wonder if the eventtimer stuff that has gone into HEAD recently could
be a factor? It might change when statclock() is called.
But I think that that code was committed more than 7-10 days ago, which Steve
mentioned.
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on 06/12/2010 20:34 Jung-uk Kim said the following:
On Monday 06 December 2010 12:58 pm, Andriy Gapon wrote:
on 06/12/2010 19:42 Jung-uk Kim said the following:
Sigh... Please see the history of calcru() in
sys/kern/kern_resource.c. Most important ones are:
http://svn.freebsd.org/viewvc
try setting sysctl kern.eventtimer.periodic=1 if it's
not 1 already?
And cc-ing Alexander, just in case.
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Overlooked this point - TSC can be very well used as a timecounter.
And in that case non-invariant TSC would veto P-state changes, which is the
proper
thing to do, IMO.
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source cpu ticks, and then everything else
should just work?
BTW, if someone comes up with a patch for more or less correct accounting when
cpu ticks frequency is allowed to change, then I am all for it.
But, IMO, it's just easier to use stable cpu ticks.
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on 06/12/2010 21:27 Jung-uk Kim said the following:
On Monday 06 December 2010 02:09 pm, Andriy Gapon wrote:
on 06/12/2010 21:01 Jung-uk Kim said the following:
:-) Don't get me wrong, I generally agree with you *iff* it does
: not
hurt too much. Anyway, this issue should be resolved from
with
freebsd also uses the in-kernel netgraph pppoe module. I use it 24 x 7 on my
gateway
as I never got around to installing mpd and it did the job.
BTW, there is a rumor that mpd may become an 'in source' program too.
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as frequently as P-states,
if ever.
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. it's probably a good idea to merge i386 and amd64 tsc.c files into a common
x86 version, which would be the same as i386 version, which seems to be generic
enough.
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Andriy Gapon
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on 03/12/2010 20:05 Jung-uk Kim said the following:
On Friday 03 December 2010 12:26 pm, Andriy Gapon wrote:
FreeBSD uses cpu_ticks [function pointer] in a few places for a few
things like process CPU time accounting. On x86 cpu_ticks always
points to rdtsc. If TSC is not invariant that leads
on 03/12/2010 22:03 Jung-uk Kim said the following:
On Friday 03 December 2010 01:14 pm, Andriy Gapon wrote:
on 03/12/2010 20:05 Jung-uk Kim said the following:
On Friday 03 December 2010 12:26 pm, Andriy Gapon wrote:
FreeBSD uses cpu_ticks [function pointer] in a few places for a
few things
important too
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on 26/11/2010 15:48 Bruce Cran said the following:
On Fri, 26 Nov 2010 15:28:00 +0200
Andriy Gapon a...@freebsd.org wrote:
What's cdfs? :-/
Apparently it's another name for ISO 9660 -
http://en.wikipedia.org/wiki/ISO_9660 - which we call cd9660.
Hence the emoticon.
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Andriy Gapon
on 26/11/2010 21:08 Alexander Best said the following:
On Fri Nov 26 10, Andriy Gapon wrote:
on 26/11/2010 00:25 Alexander Best said the following:
hi there,
i've tripped over two issues with the cdfs:
What's cdfs? :-/
1) take a 4 GB example.file
2) do `mkisofs -iso-level 4 -input
on 20/11/2010 11:54 Andriy Gapon said the following:
This suggestion sounds quite appealing.
But I have some concerns.
What if hardware has the capability, but there is no cpufreq - could these
MSRs
be still useful? Or are they useful only with cpufreq? Probably the
latter
on 22/11/2010 16:30 John Baldwin said the following:
No. Especially since the structure is private it can always be revived if a
use is found for it. You can probably leave the taskqueue_create() API the
same for now though.
OK. Committed.
Thank you!
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Andriy Gapon
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