Messages in this thread | | | From | Linus Torvalds <> | Date | Mon, 18 Sep 2023 11:05:31 -0700 | Subject | Re: [RFC PATCH 00/14] Prevent cross-cache attacks in the SLUB allocator |
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On Mon, 18 Sept 2023 at 10:39, Ingo Molnar <mingo@kernel.org> wrote: > > What's the split of the increase in overhead due to SLAB_VIRTUAL=y, between > user-space execution and kernel-space execution?
... and equally importantly, what about DMA?
Or what about the fixed-size slabs (aka kmalloc?) What's the point of "never re-use the same address for a different slab", when the *same* slab will contain different kinds of allocations anyway?
I think the whole "make it one single compile-time option" model is completely and fundamentally broken.
Linus
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