Re: 2.1.xxx makes Electric Fence 22x slower

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 31 Aug 1998 12:14:11 +0100 (BST)


> Applications which need a lot of page-sized VMAs are:
>
> * object-oriented databases,

Persistent storage stuff (Texas etc)

> * generational garbage collection (Java, Lisp),
> * debugging tools (ElectricFence, software watchpoints).
>
> "Common" or not, these applications have a lot of VMAs and do a lot
> of mmap() and mprotect().

And my 386 still uses verify_area() because on it (and maybe other
platforms) there is no write protect in kernel mode. Also for that matter
the general mix of stuff I've fired up on it hasnt seemed to be harmed
too much. At least the draft fuzzy cache patch didnt speed it up noticably.

I've not tried -lefence on it yet

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