Messages in this thread | | | Date | Wed, 08 Apr 2009 08:00:34 -0700 | From | Masami Hiramatsu <> | Subject | Re: [RFC][PROTO][PATCH -tip 0/7] kprobes: support jump optimization on x86 |
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Frank Ch. Eigler wrote: > On Wed, Apr 08, 2009 at 01:06:02PM +0200, Andi Kleen wrote: >> [...] >>> I'm curious: what is the biggest kprobe count you've ever seen, in >>> the field? 1000? 10,000? 100,000? More? >> The limit is iirc how much memory the gcc compiling the probes program >> consumes before running out of swap space. > > On a machine with lots of free RAM, gcc will not hold itself back. On > my home server, a 40000-kprobe script compiled (pass 4) in about 4 > seconds using about 200MB RAM.
Hm, when 40,000 kprobes are optimized, it will consume less than 8MB ... I guess that is acceptable for recent machines.
Thank you,
-- Masami Hiramatsu
Software Engineer Hitachi Computer Products (America) Inc. Software Solutions Division
e-mail: mhiramat@redhat.com
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