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Re: question regarding accessing a target variable
- From: "Frank Ch. Eigler" <fche at redhat dot com>
- To: Kai Wong <kai_wong at symantec dot com>
- Cc: systemtap at sources dot redhat dot com
- Date: Sat, 3 Jan 2009 08:49:34 -0500
- Subject: Re: question regarding accessing a target variable
- References: <20217654.post@talk.nabble.com> <y0mtzawurrj.fsf@ton.toronto.redhat.com> <1A193CCB5218B14589B1979BC7D510E006F0EB1E@TUS1XCHCLUPIN11.enterprise.veritas.com> <20081029201826.GC16968@redhat.com> <1A193CCB5218B14589B1979BC7D510E006F0ECBC@TUS1XCHCLUPIN11.enterprise.veritas.com> <1A193CCB5218B14589B1979BC7D510E007077719@TUS1XCHCLUPIN11.enterprise.veritas.com> <20081104152629.GB28139@redhat.com> <1A193CCB5218B14589B1979BC7D510E0070F51F0@TUS1XCHCLUPIN12.enterprise.veritas.com> <20081107020842.GG20928@redhat.com> <1A193CCB5218B14589B1979BC7D510E007AE9FA4@TUS1XCHCLUPIN11.enterprise.veritas.com>
Hi -
On Fri, Jan 02, 2009 at 06:28:59PM -0700, Kai Wong wrote:
> [...] If none of the other options applies or works, but I can
> modify the source of the probed software, does inserting
> inline-assembly directives as shown in that example slow down the
> performance of the probed software when not probed (assuming the
> "volatile" directives stays)?
It should not, in any material way. You can confirm with measurements
of course, or by looking over the assembly/object code before & after.
- FChE