Quote: implement data breakpoints by code patching; 42% overhead; use segmented bitmap, reserved registers, loop entry checks, range checks

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we adopt a code patching approach to checking … [p. 11] Among the data breakpoint implementation methods we studied on the … segmented bitmap, reserving registers to hold intermediate values … First, its overhead is independent of the number … Finally, this choice simplifies both the monitor library … [p. 2, On i386 architectures, restrict checks to data breakpoints, perform checks at entry to loops, and efficiently check contiguous ranges of memory locations.   Google-1   Google-2

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