diff options
| author | Michael Neuling <mikey@neuling.org> | 2013-09-26 13:29:09 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-13 16:08:31 -0700 |
| commit | 72daf965bb8fe1447069db3ea511047f20eca947 (patch) | |
| tree | 11ab786f3eafb9a6fc9b5c79f0d086f62eb10b91 /arch/powerpc/kernel/vio.c | |
| parent | 09bee3bc290da5f7f39b62f65f1a3deeaa3834ac (diff) | |
powerpc/tm: Switch out userspace PPR and DSCR sooner
commit e9bdc3d6143d1c4b8d8ce5231fc958268331f983 upstream.
When we do a treclaim or trecheckpoint we end up running with userspace
PPR and DSCR values. Currently we don't do anything special to avoid
running with user values which could cause a severe performance
degradation.
This patch moves the PPR and DSCR save and restore around treclaim and
trecheckpoint so that we run with user values for a much shorter period.
More care is taken with the PPR as it's impact is greater than the DSCR.
This is similar to user exceptions, where we run HTM_MEDIUM early to
ensure that we don't run with a userspace PPR values in the kernel.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/kernel/vio.c')
0 files changed, 0 insertions, 0 deletions