Author: marius
Date: Sat Jan 28 23:18:02 2012
New Revision: 230672
URL: http://svn.freebsd.org/changeset/base/230672
Log:
MFC: r225888
Add a comment about why contrary to what once would think running all of
userland with total store order actually is appropriate.
Modified:
stable/8/sys/sparc64/sparc64/machdep.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/sparc64/sparc64/machdep.c
==============================================================================
--- stable/8/sys/sparc64/sparc64/machdep.c Sat Jan 28 23:17:58 2012
(r230671)
+++ stable/8/sys/sparc64/sparc64/machdep.c Sat Jan 28 23:18:02 2012
(r230672)
@@ -1014,6 +1014,10 @@ exec_setregs(struct thread *td, u_long e
tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
tf->tf_tnpc = entry + 4;
tf->tf_tpc = entry;
+ /*
+ * While we could adhere to the memory model indicated in the ELF
+ * header, it turns out that just always using TSO performs best.
+ */
tf->tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_MM_TSO;
td->td_retval[0] = tf->tf_out[0];
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