On 12-Nov-18 11:18 AM, Alejandro Lucero wrote:
When using large amount of hugepage based memory, doing all the
hugepages mapping can take quite significant time.
The problem is hugepages being initially mmaped to virtual addresses
which will be tried later for the final hugepage mmaping. This causes
the final mapping requiring calling mmap with another hint address which
can happen several times, depending on the amount of memory to mmap, and
which each mmmap taking more than a second.
This patch changes the hint for the initial hugepage mmaping using
a starting address which will not collide with the final mmaping.
Fixes: 293c0c4b957f ("mem: use address hint for mapping hugepages")
Signed-off-by: Alejandro Lucero <alejandro.luc...@netronome.com>
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Hi Alejandro,
I'm not sure i understand the purpose. When final mapping is performed,
we reserve new memory area, and map pages into it. (i don't quite
understand why we unmap the area before mapping pages, but it's how it's
always been and i didn't change it in the legacy code)
Which addresses are causing the collision?
--
Thanks,
Anatoly
