[oe-commits] [bitbake] 03/03: siggen: Split get_tashhash for performance

git at git.openembedded.org git at git.openembedded.org
Sat Dec 14 13:01:51 UTC 2019


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rpurdie pushed a commit to branch master-next
in repository bitbake.

commit 621dae000687785238172c08264967e7bb877947
Author: Richard Purdie <richard.purdie at linuxfoundation.org>
AuthorDate: Fri Dec 13 16:07:28 2019 +0000

    siggen: Split get_tashhash for performance
    
    There are two operations happening in get_taskhash, the building of the
    underlying data and the calculation of the hash.
    
    Split these into two funtions since the preparation part doesn't need
    to rerun when unihash changes, only the calculation does.
    
    This split allows sigificant performance improvements for hashequiv
    in builds where many hashes are equivalent and many hashes are changing.
    
    Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 lib/bb/runqueue.py |  1 +
 lib/bb/siggen.py   | 33 ++++++++++++++++++++++++---------
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/lib/bb/runqueue.py b/lib/bb/runqueue.py
index b3648dd..515e9d4 100644
--- a/lib/bb/runqueue.py
+++ b/lib/bb/runqueue.py
@@ -1185,6 +1185,7 @@ class RunQueueData:
         procdep = []
         for dep in self.runtaskentries[tid].depends:
             procdep.append(dep)
+        bb.parse.siggen.prep_taskhash(tid, procdep, self.dataCaches[mc_from_tid(tid)])
         self.runtaskentries[tid].hash = bb.parse.siggen.get_taskhash(tid, procdep, self.dataCaches[mc_from_tid(tid)])
         self.runtaskentries[tid].unihash = bb.parse.siggen.get_unihash(tid)
 
diff --git a/lib/bb/siggen.py b/lib/bb/siggen.py
index 2fec859..e484e5e 100644
--- a/lib/bb/siggen.py
+++ b/lib/bb/siggen.py
@@ -52,6 +52,9 @@ class SignatureGenerator(object):
     def get_unihash(self, tid):
         return self.taskhash[tid]
 
+    def prep_taskhash(self, tid, deps, dataCache):
+        return
+
     def get_taskhash(self, tid, deps, dataCache):
         self.taskhash[tid] = hashlib.sha256(tid.encode("utf-8")).hexdigest()
         return self.taskhash[tid]
@@ -198,12 +201,11 @@ class SignatureGeneratorBasic(SignatureGenerator):
             pass
         return taint
 
-    def get_taskhash(self, tid, deps, dataCache):
+    def prep_taskhash(self, tid, deps, dataCache):
 
         (mc, _, task, fn) = bb.runqueue.split_tid_mcfn(tid)
 
-        data = dataCache.basetaskhash[tid]
-        self.basehash[tid] = data
+        self.basehash[tid] = dataCache.basetaskhash[tid]
         self.runtaskdeps[tid] = []
         self.file_checksum_values[tid] = []
         recipename = dataCache.pkg_fn[fn]
@@ -216,7 +218,6 @@ class SignatureGeneratorBasic(SignatureGenerator):
                 continue
             if dep not in self.taskhash:
                 bb.fatal("%s is not in taskhash, caller isn't calling in dependency order?" % dep)
-            data = data + self.get_unihash(dep)
             self.runtaskdeps[tid].append(dep)
 
         if task in dataCache.file_checksums[fn]:
@@ -226,27 +227,41 @@ class SignatureGeneratorBasic(SignatureGenerator):
                 checksums = bb.fetch2.get_file_checksums(dataCache.file_checksums[fn][task], recipename)
             for (f,cs) in checksums:
                 self.file_checksum_values[tid].append((f,cs))
-                if cs:
-                    data = data + cs
 
         taskdep = dataCache.task_deps[fn]
         if 'nostamp' in taskdep and task in taskdep['nostamp']:
             # Nostamp tasks need an implicit taint so that they force any dependent tasks to run
             if tid in self.taints and self.taints[tid].startswith("nostamp:"):
                 # Don't reset taint value upon every call
-                data = data + self.taints[tid][8:]
+                pass
             else:
                 import uuid
                 taint = str(uuid.uuid4())
-                data = data + taint
                 self.taints[tid] = "nostamp:" + taint
 
         taint = self.read_taint(fn, task, dataCache.stamp[fn])
         if taint:
-            data = data + taint
             self.taints[tid] = taint
             logger.warning("%s is tainted from a forced run" % tid)
 
+        return
+
+    def get_taskhash(self, tid, deps, dataCache):
+
+        data = self.basehash[tid]
+        for dep in self.runtaskdeps[tid]:
+            data = data + self.get_unihash(dep)
+
+        for (f, cs) in self.file_checksum_values[tid]:
+            if cs:
+                data = data + cs
+
+        if tid in self.taints:
+            if self.taints[tid].startswith("nostamp:"):
+                data = data + self.taints[tid][8:]
+            else:
+                data = data + self.taints[tid]
+
         h = hashlib.sha256(data.encode("utf-8")).hexdigest()
         self.taskhash[tid] = h
         #d.setVar("BB_TASKHASH_task-%s" % task, taskhash[task])

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