Re: [patch 0/5] Support for sanitization flag in low-level pageallocator

From: Alan Cox
Date: Thu May 28 2009 - 02:26:59 EST

> > As for being swapped out - I do not believe that kernel stacks can
> > ever be swapped out in Linux.
> yes, i referred to that as an undesirable option - because it slows
> down pthread_create() quite substantially.
> This needs before/after pthread_create() benchmark results.

kernel stacks can end up places you don't expect on hypervisor based

In most respects the benchmarks are pretty irrelevant - wiping stuff has
a performance cost, but its the sort of thing you only want to do when
you have a security requirement that needs it. At that point the
performance is secondary.

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