[OE-core] [PATCH 2/3] staging: Reduce the number of mkdirs calls

[Richard Purdie]

The number of mkdir calls was showing up high on the profile charts since
it was getting called once per file which is excessive. Each call results
in one or more syscalls which is bad for performance. Cache which
directories we've seen to reduce the calls to a more reasonable number
and speed up recipe specific sysroots.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 meta/classes/staging.bbclass | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/meta/classes/staging.bbclass b/meta/classes/staging.bbclass
index 35e53fe..93d31eb 100644
--- a/meta/classes/staging.bbclass
+++ b/meta/classes/staging.bbclass
@@ -244,7 +244,7 @@ python do_populate_sysroot_setscene () {
 }
 addtask do_populate_sysroot_setscene
 
-def staging_copyfile(c, target, fixme, postinsts, stagingdir):
+def staging_copyfile(c, target, fixme, postinsts, stagingdir, seendirs):
     import errno
 
     if c.endswith("/fixmepath"):
@@ -255,7 +255,10 @@ def staging_copyfile(c, target, fixme, postinsts, stagingdir):
     #bb.warn(c)
     dest = c.replace(stagingdir, "")
     dest = target + "/" + "/".join(dest.split("/")[3:])
-    bb.utils.mkdirhier(os.path.dirname(dest))
+    destdir = os.path.dirname(dest)
+    if destdir not in seendirs:
+        bb.utils.mkdirhier(destdir)
+        seendirs.add(destdir)
     if "/usr/bin/postinst-" in c:
         postinsts.append(dest)
     if os.path.islink(c):
@@ -278,10 +281,12 @@ def staging_copyfile(c, target, fixme, postinsts, stagingdir):
                 raise
     return dest
 
-def staging_copydir(c, target, stagingdir):
+def staging_copydir(c, target, stagingdir, seendirs):
     dest = c.replace(stagingdir, "")
     dest = target + "/" + "/".join(dest.split("/")[3:])
-    bb.utils.mkdirhier(dest)
+    if dest not in seendirs:
+        bb.utils.mkdirhier(dest)
+        seendirs.add(dest)
 
 def staging_processfixme(fixme, target, recipesysroot, recipesysrootnative, d):
     import subprocess
@@ -302,6 +307,7 @@ def staging_populate_sysroot_dir(targetsysroot, nativesysroot, native, d):
 
     fixme = []
     postinsts = []
+    seendirs = set()
     stagingdir = d.getVar("STAGING_DIR")
     if native:
         pkgarchs = ['${BUILD_ARCH}', '${BUILD_ARCH}_*']
@@ -332,10 +338,10 @@ def staging_populate_sysroot_dir(targetsysroot, nativesysroot, native, d):
                 for l in f:
                     l = l.strip()
                     if l.endswith("/"):
-                        staging_copydir(l, targetdir, stagingdir)
+                        staging_copydir(l, targetdir, stagingdir, seendirs)
                         continue
                     try:
-                        staging_copyfile(l, targetdir, fixme, postinsts, stagingdir)
+                        staging_copyfile(l, targetdir, fixme, postinsts, stagingdir, seendirs)
                     except FileExistsError:
                         continue
 
@@ -492,6 +498,7 @@ python extend_recipe_sysroot() {
     fixme = {}
     fixme[''] = []
     fixme['native'] = []
+    seendirs = set()
     postinsts = []
     multilibs = {}
     manifests = {}
@@ -570,14 +577,14 @@ python extend_recipe_sysroot() {
                     l = l.strip()
                     if l.endswith("/"):
                         if native:
-                            dest = staging_copydir(l, recipesysrootnative, stagingdir)
+                            dest = staging_copydir(l, recipesysrootnative, stagingdir, seendirs)
                         else:
-                            dest = staging_copydir(l, destsysroot, stagingdir)
+                            dest = staging_copydir(l, destsysroot, stagingdir, seendirs)
                         continue
                     if native:
-                        dest = staging_copyfile(l, recipesysrootnative, fixme['native'], postinsts, stagingdir)
+                        dest = staging_copyfile(l, recipesysrootnative, fixme['native'], postinsts, stagingdir, seendirs)
                     else:
-                        dest = staging_copyfile(l, destsysroot, fixme[''], postinsts, stagingdir)
+                        dest = staging_copyfile(l, destsysroot, fixme[''], postinsts, stagingdir, seendirs)
                     if dest:
                         m.write(dest.replace(workdir + "/", "") + "\n")
 
-- 
2.7.4