Re: wait_event_* and wake_up_*

On Jul 22, 2014 10:41 PM, "Mohammad Merajul Islam Molla" < meraj.eni...@gmail.com> wrote: > > You may find this useful - http://www.makelinux.net/ldd3/chp-6-sect-2 > > Thanks Meraj, that is really helpful. > -- > Thanks, > -Meraj > > On Wed, Ju

wait_event_* and wake_up_*

Hello, Could someone point me to good documentation about the wait_event_* and wake_up_* event family APIs? I tried searching and nothing concrete shows up. In particular: When do we use wake_up_interruptible()? Does wake_up(wq) wake up all the threads which are waiting on that work queue? Is t

Do per cpu variables need to be atomic?

Hello, Let us say we have a per-cpu data structure as follows: struct data { atomic_t val; }; Since this is a per-cpu data structure, do I need to have 'val' as atomic? Or can I just use a normal 'int' for val? Also are the following the same? If yes, which is preferable? DEFINE_PER_CP

Re: Do per cpu variables need to be atomic?

On Thu, Jul 10, 2014 at 4:55 PM, Christoph Lameter wrote: > On Thu, 10 Jul 2014, Pranith Kumar wrote: > >> > Per cpu data structures are for the use of one cpu exclusively. If you use >> > the variable as intended then there is no atomic_t required. If you want >> &

Re: Do per cpu variables need to be atomic?

Hi Christoph, Thank you for answering. On Thu, Jul 10, 2014 at 4:25 PM, Christoph Lameter wrote: > On Thu, 10 Jul 2014, Pranith Kumar wrote: > >> Hello, >> >> Let us say we have a per-cpu data structure as follows: >> >> struct data { >> atomic_