[PATCH] Native POSIX Thread Library(NPTL) ARM SupportingPatches (1/3)

[Dan Kegel]

>>I wonder what the performance impact is of having a system call in
>>THREAD_SELF.  If it turns out to be too great, it may be possible to
>>reduce the overhead by adding some more support to the kernel.  What
>>I've been thinking of is a way for applications to supply a pointer to
>>the kernel (via a new system call), and have it store the 
>>current thread
>>ID at that address during context switch.  That way, retrieving the
>>thread descriptor would be just a regular memory access.

This reminds me of vsyscalls.  Can someone in the know compare and
contrast the current proposal and vsyscalls?
Thanks!

- Dan

p.s. Here's a recent message from around the time they switched
the vsyscall page from something created specially by the kernel
to a tiny ELF image:
http://marc.theaimsgroup.com/?l=linux-kernel&m=105123323202704&w=2

-- 
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045