Hi,
Looking into task_struct (include/linux/scehd.h) , we have:
/* PI waiters blocked on a rt_mutex held by this task */
struct plist_head pi_waiters;
Any ideas what pi stand for ?
I assume it has nothing to do with pi from mathematics...
rgs.
Kevin
Hi kevin ,
PI stands for Priority Inheritance.
*
*
Refer : http://lxr.free-electrons.com/source/Documentation/pi-futex.txt
*
*
Regards,
yuva
On Tue, Mar 12, 2013 at 11:54 AM, Kevin Wilson wkev...@gmail.com wrote:
Hi,
Looking into task_struct (include/linux/scehd.h) , we have:
/* PI
(the first in probably a number of questions related to digging
around in embedded linux-related code -- i know there's an
embedded-linux list, if that's a better forum, i'll move stuff there.)
currently writing an intro to GPIO for my new EL course, and ran
across this in doc file
I guess we should not mix mutex and condition variable. Both have their own
respective semantics.
*mutex* is used to serialize access to a shared resource among competing
threads.
*condition variable* is used to notify a* state change* of a resource to
the interested thread.
In case of condition
On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de wrote:
Hi all,
I have some problems allocation Memory the right way and use it in my
kernel module.
I use a char device for reading and writing from/to a pcie dma card.
Especially the read function makes me some headache.
kmem_cache_alloc() is used to allocate a memory object from a respective
cache.
Can you elaborate on what is ur objective or can you get us how you have
invoked this function.
To my understanding kmem_cache_alloc() will just return a linear virtual
address (void *) of a memory object.
It would
On Tue, 12 Mar 2013 18:38:05 +0530, Prabhu nath said:
On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de wrote:
I use a char device for reading and writing from/to a pcie dma card.
Especially the read function makes me some headache. The user allocates
some memory with
Am 12.03.2013 14:08, schrieb Prabhu nath:
On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de
mailto:c.se...@tu-bs.de wrote:
Hi all,
I have some problems allocation Memory the right way and use it in my
kernel module.
I use a char device for reading
On Tue, 12 Mar 2013 15:03:53 +0100, Christoph Seitz said:
I found out, if I use the force flag with get_user_pages, the pages get
faulted, but there has to be a nicer way than using the force flag.
Why does there have to be a nicer way? Maybe you already got the nice way.
(Hint - why does
1169/*
1170 * If the new process will be in a different pid namespace
1171 * don't allow the creation of threads.
1172 */
1173if ((clone_flags (CLONE_VM|CLONE_NEWPID))
1174(task_active_pid_ns(current) != current-nsproxy-pid_ns))
1175
On Tue, Mar 12, 2013 at 06:53:49PM +0530, Prabhu nath wrote:
kmem_cache_alloc() is used to allocate a memory object from a respective
cache.
Can you elaborate on what is ur objective or can you get us how you have
invoked this function.
To my understanding kmem_cache_alloc() will just
On Tue, Mar 12, 2013 at 7:59 PM, valdis.kletni...@vt.edu wrote:
On Tue, 12 Mar 2013 18:38:05 +0530, Prabhu nath said:
On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de
wrote:
I use a char device for reading and writing from/to a pcie dma card.
Especially the read
On Wed, Mar 13, 2013 at 9:40 AM, ishare june.tune@gmail.com wrote:
On Tue, Mar 12, 2013 at 06:18:02PM +0530, Prabhu nath wrote:
I guess we should not mix mutex and condition variable. Both have their
own
respective semantics.
*mutex* is used to serialize access to a shared resource
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