tree c4983e33488c66d3fcccad07b87b27f1bd2e6841
parent 15e8f348db372dec21229fda5d52ae6ee7e64666
author Roland McGrath <roland@redhat.com> 1214260624 -0700
committer Roland McGrath <roland@redhat.com> 1216860452 -0700

x86_64 syscall audit fast-path

This adds a fast path for 64-bit syscall entry and exit when
TIF_SYSCALL_AUDIT is set, but no other kind of syscall tracing.
This path does not need to save and restore all registers as
the general case of tracing does.  Avoiding the iret return path
when syscall audit is enabled helps performance a lot.

Signed-off-by: Roland McGrath <roland@redhat.com>