Messages in this thread | | | Date | Thu, 29 Jan 2004 13:26:23 +0000 | From | Jamie Lokier <> | Subject | Re: [RFC][PATCH] linux-2.6.2-rc2_vsyscall-gtod_B1.patch |
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Ulrich Drepper wrote: > ~ alternatively use the symbol table the vdso has. Export the new code > only via the symbol table. No fixed address for the function, the > runtime gets it from the symbol table. glibc will use weak symbol > references; if the symbol isn't there, the old code is used. This will > require that every single optimized syscall needs to be handled special. > > > I personally like the first approach better. The indirection table can > maintained in sync with the syscall table inside the kernel. It all > comes at all times from the same source. The overhead of the memory > load should be neglectable.
I like the second approach more. You can change glibc to look up the weak symbol for _all_ syscalls, then none of them are special and it will work with future kernel optimisations.
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