Messages in this thread | | | Subject | Re: TSCs are a no-no on i386 | From | Alan Cox <> | Date | 31 Jul 2003 17:01:45 +0100 |
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On Iau, 2003-07-31 at 16:10, Jamie Lokier wrote: > > And if the byte you are looking at was patched by another thread you've > > blown it. Your emulation can only be so good 8) People do stuff like > > patching instructions under software decode as a robustness check - its > > normally pretty amusing > > On a uniprocessor 386, this is not a problem. Just disable preemption > in the kernel decoder.
Wrong again. Thats a common myth but you see I can put the instruction on a page so that its executed from a page I just did a read() into in another process. If I'm really bored I'll use O_DIRECT but thats mostly for makign life really bad for non cache coherent setups 8)
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