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SubjectRe: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)
On 01/19/2010 12:15 AM, Jim Keniston wrote:
>
>> I don't like the idea but if the performance benefits are real (are
>> they?),
>>
> Based on what seems to be the closest thing to an apples-to-apples
> comparison -- counting the number of calls to a specified function --
> uprobes is 6-7 times faster than the ptrace-based equivalent, ltrace -c.
> And of course, uprobes provides much, much more flexibility, appears to
> scale better, and works with multithreaded apps.
>
> Likewise, FWIW, utrace is more than 10x faster than strace -c in
> counting system calls.
>
>

This is still with a kernel entry, yes? Do you have plans for a variant
that's completely in userspace?

--
error compiling committee.c: too many arguments to function



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