Re: Inefficient ia64 system call implementation in glibc

From: David Mosberger <>
Date: 2003-09-23 07:25:36
>>>>> On Sat, 20 Sep 2003 15:01:26 +0200, Andreas Schwab <> said:

  Andreas> "Jim Hull" <> writes:
  >> But my real issue with the performance of this code is not with
  >> sign-extend or the scheduling these instructions, it's with the
  >> break instruction.  I may be mistaken, but hasn't it been many
  >> months since David Mosberger implemented all the kernel
  >> infrastructure needed to support syscalls using the epc
  >> instruction?

  Andreas> It's only implemented in 2.6 so far.

No, the glibc support is completely orthogonal to the kernel support.
If glibc uses the new stubs on a kernel which doesn't support
kernel-entry via EPC, it will transparently fall back to using BREAK.

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Received on Mon Sep 22 17:26:26 2003

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