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Date: Fri, 29 Jan 2016 11:45:43 +0100
From: Pavel Machek <>
To: Laura Abbott <>
Cc: Andrew Morton <>,
	"Kirill A. Shutemov" <>,
	Vlastimil Babka <>, Michal Hocko <>,
	"Rafael J. Wysocki" <>,
	Len Brown <>,,,,
	Kees Cook <>,
Subject: Re: [PATCHv2 2/2] mm/page_poisoning.c: Allow for zero poisoning


> By default, page poisoning uses a poison value (0xaa) on free. If this
> is changed to 0, the page is not only sanitized but zeroing on alloc
> with __GFP_ZERO can be skipped as well. The tradeoff is that detecting
> corruption from the poisoning is harder to detect. This feature also
> cannot be used with hibernation since pages are not guaranteed to be
> zeroed after hibernation.

So... this makes kernel harder to debug for performance advantage...?
If so.. how big is the performance advantage?
(cesky, pictures)

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