18.11.2015 17:07, Vladimir Davydov пишет:
On Wed, Nov 18, 2015 at 07:12:10PM +0400, Stanislav Kinsburskiy wrote:
This patch add pages zeroing option to free_pages_prepare().
It's disabled by default. To enable it one should add "zero-free-pages"
kernel option to kernel boot parameters.
Note, that kernel boot option handling and enabling of pages zeroing are
divided. The reason for this is that static keys initialization can't be
performed during kernel parameters parsing (can't specify, what is the exact
reason, but kernel just doesn't boot, if static key is incremented on
parameter callback). Because of this split, actual zeroing is enabled later
during kernel boot, but still early enough.
Another thing to notice, is that code is moved to a separate source file.
The reason for this is to simplify rebases in future.
I don't think it's worth it. Surely you avoid adding new functions to
mm/page_alloc.c, but in return you have to patch mm/internal.h and
mm/Makefile, and you patch mm/page_alloc.c anyway. But I don't do
rebases, so up to Konstantin. The patch itself should compile and work
as expected AFAICS.
Makes sense.
I'll send next version and Konstantin can select any.
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