[Devel] [PATCH rh7] x86: "pages zeroing on free" option introduced

[Stanislav Kinsburskiy]

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.