You *can't* require an unchanging interface to changeable internals. [LWN.net]

You can't require an unchanging interface to changeable internals.

Posted Sep 28, 2006 21:57 UTC (Thu) by efexis (guest, #26355)
In reply to: You *can't* require an unchanging interface to changeable internals. by dlang
Parent article: Tracing infrastructures

Can't we learn anything from SMP Alternatives? Ie, stick a couple of NOP's in the code big enough to replace it with a CALL instruction when you want to add a tracepoint there. On 64bit systems I guess the CALL instruction is going to be longer (including the 64bit address), so maybe a JMP $+9 and a few NOP's would be quicker than just the NOP's (I haven't looked into processor instruction timings for a -long time-).

(Log in to post comments)