[bitbake-devel] [PATCH] build.py: Only execute mkdirhier if stampdir doesn't exist

Richard Purdie richard.purdie at linuxfoundation.org
Wed Aug 15 15:57:47 UTC 2012

I noticed this was showing up on profile logs as a sigificant time user
in "bitbake bash" when bash was already built. It reduces the time from
5.2 to 4.5 seconds in my test environment.

We make use of the parser's mtime cache as once a directory exists,
we can assume it continues to exist and this avoids syscalls.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
diff --git a/bitbake/lib/bb/build.py b/bitbake/lib/bb/build.py
index bea2926..d64077e 100644
--- a/bitbake/lib/bb/build.py
+++ b/bitbake/lib/bb/build.py
@@ -464,7 +464,9 @@ def stamp_internal(taskname, d, file_name):
     stamp = bb.parse.siggen.stampfile(stamp, file_name, taskname, extrainfo)
-    bb.utils.mkdirhier(os.path.dirname(stamp))
+    stampdir = os.path.dirname(stamp)
+    if bb.parse.cached_mtime_noerror == 0:
+        bb.utils.mkdirhier(stampdir)
     return stamp

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