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-rw-r--r--src/gallium/drivers/llvmpipe/README38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/README b/src/gallium/drivers/llvmpipe/README
index 8b5539d2c5..ec30d4d708 100644
--- a/src/gallium/drivers/llvmpipe/README
+++ b/src/gallium/drivers/llvmpipe/README
@@ -131,6 +131,44 @@ replacing the native ICD driver, but it's quite an advanced usage, so if you
need to ask, don't even try it.
+Profiling
+=========
+
+To profile llvmpipe you should pass the options
+
+ scons debug=no profile=yes <same-as-before>
+
+This will ensure that frame pointers are used both in C and JIT functions, and
+that no tail call optimizations are done by gcc.
+
+
+To better profile JIT code you'll need to build LLVM with oprofile integration.
+
+ source_dir=$PWD/llvm-2.6
+ build_dir=$source_dir/build/profile
+ install_dir=$source_dir-profile
+
+ mkdir -p "$build_dir"
+ cd "$build_dir" && \
+ $source_dir/configure \
+ --prefix=$install_dir \
+ --enable-optimized \
+ --disable-profiling \
+ --enable-targets=host-only \
+ --with-oprofile
+
+ make -C "$build_dir"
+ make -C "$build_dir" install
+
+ find "$install_dir/lib" -iname '*.a' -print0 | xargs -0 strip --strip-debug
+
+The you should define
+
+ export LLVM=/path/to/llvm-2.6-profile
+
+and rebuild.
+
+
Unit testing
============