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[Bug libc/19767] vdso is not used with static linking
- From: "carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Fri, 04 Mar 2016 21:47:09 +0000
- Subject: [Bug libc/19767] vdso is not used with static linking
- Auto-submitted: auto-generated
- References: <bug-19767-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19767
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |carlos at redhat dot com
--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Szabolcs Nagy from comment #0)
> vdso mechanism now uses ifunc dispatch which happens
> too early in the static linking case so the vdso
> mechanism is disabled even though the vdso mechanism
> could easily work with static linking too.
>
> this means clock_gettime etc calls will go through
> slow syscalls in case of static linking.
>
> bug 12813 was closed assuming performance does not
> matter of static linking, but i think it does.
I agree that performance matters. We should fix this if we can, but only as
long as it doesn't restrict the dynamically linked implementation.
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