Date: Fri, 29 Jan 2016 11:45:43 +0100 From: Pavel Machek <pavel@...x.de> To: Laura Abbott <labbott@...oraproject.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...e.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Len Brown <len.brown@...el.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org>, linux-pm@...r.kernel.org Subject: Re: [PATCHv2 2/2] mm/page_poisoning.c: Allow for zero poisoning Hi! > 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? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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