https://bugs.freedesktop.org/show_bug.cgi?id=107670
--- Comment #16 from Michel Dänzer <[email protected]> ---
(In reply to iive from comment #15)
> Aka, I do expect that the whole 512MB buffer is mapped at once.
It's not (if it was, one process could access the buffer object memory of
another process, bypassing process separation), TTM maps the memory of each
buffer object into userspace individually.
The whole MTRR thing is irrelevant anyway due to PAT.
You've found the problem in glibc's memcpy() reading from the destination, no
need to look any further.
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