Messages in this thread | | | Date | Tue, 5 Jun 2012 17:24:11 -0400 | From | "Frank Ch. Eigler" <> | Subject | Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature on i386 |
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Hi -
On Tue, Jun 05, 2012 at 04:37:46PM -0400, Steven Rostedt wrote: > [...] > I'm not sure we really need to restore all the regs. I'll keep this for > now, but for an optimization, we can just restore the ones that mcount > mcount needs to. > > Or do you expect kprobes to change any of theses?
That would be the way for a kprobe to modify variables/values that happen to be in the registers. In systemtap, for example:
# stap -g -e 'probe kernel.function("foo") { $bar = 1 }'
- FChE
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