Hi Mulyadi
I am able to do mmap and access virual-memory address and pages for a
single process from user-space and working fine. I am not sure how to do it
for multiple processes for shared resources using mmap. I better explain
in detail here what I am experimenting it.
for example:
Kernel allocates kmalloc or vmalloc of 100 pages and set those pages
as reserved. Kernel uses these pages to send/receive data to Process A or B
depends on a condition.
Process A and B do mmap those region to get/set data on those
virtual-addresses/pages because I want faster access from userpace to
kernel.
Anyone knows if this will work with mmap?. Please let me know if anyother
way to do it.
On Sat, Oct 27, 2012 at 10:57 PM, Mulyadi Santosa mulyadi.sant...@gmail.com
wrote:
Hi...
On Thu, Oct 18, 2012 at 3:02 AM, Sengottuvelan S
sengottuvela...@gmail.com wrote:
For example,
I have 2 different user space process A,B etc. I have to allocate memory
in
Kernel for each of those processes (for example 2 pages) . Each process
is
allowed to use only 1 page using mmap from user space.
Is it possible to do with mmap?.
Not sure, but I guess better to do it directly with page_alloc...or at
least kmalloc() to better utilize slab.
The thing that I think is hard to do, is to implement protection
scheme to make sure say process A won't access page allocated by
process B.
Hopefully I understand your goal correctly.
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
--
Regards,
S. Sengottuvelan.
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