Using PAT features from user space

Using PAT features from user space

[Alessandro Pignotti]

Hi everyone,

I'm writing an high performance application on x86-64 that allocate
some memory to store a write only journal. I was wondering if there is
a way to ask the kernel to mark such pages as write combining memory.
More in general, it's possible to use PAT from userspace? I was
expecting some mmap flag like MAP_NOCACHE, but there not seems to be
any such flags.

Regards,
Alessandro

Re: Using PAT features from user space

[pei lin]

http://www.mjmwired.net/kernel/Documentation/x86/pat.txt
http://www.mjmwired.net/kernel/Documentation/x86/mtrr.txt
hope this can give u some clues.

Best Regards
Lin

2009/9/13 Alessandro Pignotti <alexpigna.dev@gmail.com>:
> Hi everyone,
>
> I'm writing an high performance application on x86-64 that allocate
> some memory to store a write only journal. I was wondering if there is
> a way to ask the kernel to mark such pages as write combining memory.
> More in general, it's possible to use PAT from userspace? I was
> expecting some mmap flag like MAP_NOCACHE, but there not seems to be
> any such flags.
>
> Regards,
> Alessandro
> --
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