On Sat, Sep 10, 2011 at 7:24 PM, Roger Pau Monné
roger@entel.upc.edu wrote:
Hello,
Thanks for the atop tip, now I'm able to pass the memory around, but
the kernel crashes shortly after reading the value from the returned
memory region:
panic: kernel diagnostic assertion
It is called pipe(2), isn't it?
Thanks for the reply, but I don't understand why pipe could be helpful
in this situation, the mmap kernel call needs to return a paddr_t (a
memory region), and pipe returns a pair of file descriptors, that I
cannot pass to the kernel. The flow of a PUD call is
Hello,
Thanks for the reply, sometimes I'm so focused in the problem that I
forget the big picture. PUD is a framework present in NetBSD that
allows to implement character and block devices in userspace. [1]
The blktap (“block tap”) userspace toolkit provides a user-level disk
I/O interface in
On Sat, Sep 10, 2011 at 12:05:53PM +0200, Roger Pau Monn? wrote:
Hello,
Thanks for the reply, sometimes I'm so focused in the problem that I
forget the big picture. PUD is a framework present in NetBSD that
allows to implement character and block devices in userspace. [1]
The blktap
I do not understahd why it is desirable to involve additional context
switches to and from userspace into this data path.
Instead of writing a bunch of fairly dubious page mapping code [...]
in the kernel to support user-space daemons handling various virtual
disk formats, why not put the
Manuel Bouyer bou...@antioche.eu.org wrote:
You have mlock(2) for this. I think ntpd uses it, you can have a look here.
Of course you don't want to mlock a big process ...
You meant mlockall(2)
It seemed to work, but after intensive testing I still see deadlocks,
and a printf added in
Emmanuel Dreyfus m...@netbsd.org wrote:
[using mlockall(2) to prevent userland filesystem to be swaped out]
It seemed to work, but after intensive testing I still see deadlocks,
and a printf added in uvm_swapout() shows that perfused still gets
swaped out despite the mlockall call. Is that a
