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Re: Pointer chain paranoia
- From: Roland McGrath <roland at redhat dot com>
- To: Mike Mason <mmlnx at us dot ibm dot com>
- Cc: systemtap at sources dot redhat dot com
- Date: Tue, 14 Nov 2006 11:23:47 -0800 (PST)
- Subject: Re: Pointer chain paranoia
The deref macro expands to code that is quite cheap. The inline code is
just the load instruction about like the compiler would normally generate.
The extra code is in the exception-handling lookaside section, which adds
bloat to the total .ko size but not to the normal module code paths that
will ever be occupying I-cache in normal operation.