Author: marius
Date: Fri Sep 30 20:23:18 2011
New Revision: 225888
URL: http://svn.freebsd.org/changeset/base/225888
Log:
Add a comment about why contrary to what once would think running all of
userland with total store order actually is appropriate.
Modified:
head/sys/sparc64/sparc64/machdep.c
Modified: head/sys/sparc64/sparc64/machdep.c
==============================================================================
--- head/sys/sparc64/sparc64/machdep.c Fri Sep 30 20:13:51 2011
(r225887)
+++ head/sys/sparc64/sparc64/machdep.c Fri Sep 30 20:23:18 2011
(r225888)
@@ -1015,6 +1015,10 @@ exec_setregs(struct thread *td, struct i
tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
tf->tf_tnpc = imgp->entry_addr + 4;
tf->tf_tpc = imgp->entry_addr;
+ /*
+ * 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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