Hi
Since SSDL is moving to Linux, and since we want our students to feel comfort
with Linux
We are willing to help with promotion of Linux
I think (but I will have to check this) that:
1.. We can have an open day in SSDL. Students will be able to come and try
Linux on our computers.
Hi Doron
The place where the current process goes to sleep and waits until the page
is swapped in is indeed in generic_make_request() (called from submit_bio())
There is a call to block_wait_queue_running(q); which moves this process to
wait and calls for schedule() [prepare_to_wait_exclusive()
Hi Muli,
It seems like a good idea to check the time of a single block read against a
single context switch, we'll try looking more into it.
Try to find the place where the faulting process is put to sleep
and convert that code to busy wait instead, terminating the busy-wait
when the page has
Doron
You can work on 2.6.24 if you prefer. I just picked some version and checked
on it. (for some reason there is no arch/i386 in 2.6.24. Maybe they have
renamed it into x86?)
As for which function to use:
What you want to change is not the place where the io request is done, but
the place
q-make_request_fn seems to call a function __make_request()
[blk_init_queue_node initializes a pointer to this function]
__make_request calls get_request_wait() which in turn calls
prepare_to_wait_exclusive() and later io_schedule().
So the logic is exactly like in 2.6.11, but a bit more
On Thu, Sep 18, 2008 at 06:56:09PM +0300, gabik wrote:
Doron
You can work on 2.6.24 if you prefer. I just picked some version and checked
on it. (for some reason there is no arch/i386 in 2.6.24. Maybe they have
renamed it into x86?)
Yes. arch/x86 is now for both 32 and 64 bits.
Cheers,
On Thu, Sep 18, 2008 at 06:49:58PM +0300, Doron Zuckerman wrote:
Do you have any idea where we can find this?
I haven't looked at those bits recently, but it sounds like Gabi is
pointing you to the right path.
In any case, to be honest, I think what you propose doesn't make
sense, even as
