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Patch from Michel Dänzer on xorg mailing list in the thread
"ProcPutImage calls exaDoMoveOutPixmap, 4x slowdown":
"Looks like we are we're syncing unnecessarily in the migration no-op case"
diff --git a/exa/exa_migration.c b/exa/exa_migration.c
index 56b6945..c68cd76 100644
--- a/exa/exa_migration.c
+++ b/exa/exa_migration.c
@@ -129,6 +131,7 @@ exaCopyDirty(ExaMigrationPtr migrate, RegionPtr pValidDst, RegionPtr pValidSrc,
BoxPtr pBox;
int nbox;
Bool access_prepared = FALSE;
+ Bool need_sync = FALSE;
/* Damaged bits are valid in current copy but invalid in other one */
if (exaPixmapIsOffscreen(pPixmap)) {
@@ -220,14 +253,15 @@ exaCopyDirty(ExaMigrationPtr migrate, RegionPtr pValidDst, RegionPtr pValidSrc,
exaMemcpyBox (pPixmap, pBox,
fallback_src, fallback_srcpitch,
fallback_dst, fallback_dstpitch);
- }
+ } else
+ need_sync = TRUE;
pBox++;
}
if (access_prepared)
exaFinishAccess(&pPixmap->drawable, fallback_index);
- else
+ else if (need_sync)
sync (pPixmap->drawable.pScreen);
pExaPixmap->offscreen = save_offscreen;
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