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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2014-10-23 10:34:44 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2014-11-06 16:55:46 +0000 |
| commit | 87802b3402ec4a829c6507b4b78fcd03e30b6fe1 (patch) | |
| tree | b88ed62dc659cfb80fd92257cb9847323c71764e /configure.ac | |
| parent | 33764685cbcd01548b6a23c217c7b511c1639694 (diff) | |
sna: Experimental support for write-combining mmaps
If we have a linear buffer, we can request the kernel mmap it directly
with write-combining without having to pin it into the GTT. This allows
us to efficiently upload very large buffers, and can avoid the dreaded
aperture thrashing.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 8b34c773..75fd3b6f 100644 --- a/configure.ac +++ b/configure.ac @@ -760,6 +760,16 @@ if test "x$RENDERNODE" = "xyes"; then xp_msg="$xp_msg rendernode" fi +AC_ARG_ENABLE(wc-mmap, + AS_HELP_STRING([--enable-wc-map], + [Enable use of WriteCombining mmaps [default=no]]), + [WC_MMAP="$enableval"], + [WC_MMAP="no"]) +if test "x$WC_MMAP" = "xyes"; then + AC_DEFINE(USE_WC_MMAP,1,[Enable use of WriteCombining mmaps]) + xp_msg="$xp_msg mmap(wc)" +fi + AC_ARG_ENABLE(create2, AS_HELP_STRING([--enable-create2], [Enable use of create2 ioctl (experimental) [default=no]]), |