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Re: offline elfutils processing committed
- From: Roland McGrath <roland at redhat dot com>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: systemtap at sources dot redhat dot com
- Date: Wed, 1 Nov 2006 12:03:36 -0800 (PST)
- Subject: Re: offline elfutils processing committed
Go team! When I added the elfutils support for relocatability in August of
last year, I was really hoping someone would start testing it one day. ;-)
Is "somewhat longer" not an understatement? When I use elfutils'
tests/dwflmodtest with -K (offline kernel, 1389 modules) vs -k (running
kernel, 64 modules) it takes about 17 times longer (mostly i/o). Note that
dwfl_linux_kernel_report_offline lets you supply a predicate to exclude
uninteresting modules, which is the only way I've thought of to reduce the
DWARF-loading overhead (without changing the way we install it).
You didn't change dwflpp::emit_address, which is used for things like
$global_var addresses. That needs to emit references to your run-time
section addresses too.
Thanks,
Roland