Python optimizations for CentOs

Pros:
 we are seeing a 10% performance boost for all python processes.

Cons:
 The time to build python increases.
 This is because pgo (profile guided optimizations) need the unit tests
for python to be invoked and then the entire package compiled a second
time using the timing information from the unit test profiling data
that is gathered.

This commit sets up the src rpm environment for building python 2.7.5

- Needed to disable the tox unit test check phase since a couple tests
 fail due to build dependencies
- Turn off dtrace and systemtap in the spec file
- Use pgo for build in modules: https://bugs.python.org/issue26307
- Rollup cpython patches and add --enable-optimizations and
  --with-computed-gotos for optimized build

These are the cpython commits pulled in:
   4ff151a72a3331c514924a5e0d33747a91413fbd  (Sept 18, 2015 pgo)
   c543a0fc3b2052c35fced09e1f96613625723508 (Jun 2 2016) (lto)
   6d8fdfc84b8617476f3f497e93e9e7b6cecc5474  (Sept 8 2016)
   794b2912acc1995afc6fe9501cc0ca8e56565325 (Sept 8 2016)
   b9999158545f3bc089b926086daa666b8e4c7caa (Nov 20) 2016
   6a04ef7ceddae0930eba6cc57ba2ebfcef00abab  Mar 28 2017

This still does not yield the same level of performance as a vanilla
 python 2.7.14 source tree which suggests there are other commits
 that would provide a performance boost.

Change-Id: Iaddf7ead672412ad1878217ddcfaf88c9b0e2443
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>

devtools/python/python-2.7.5/README

@@ -0,0 +1,3 @@
+The src rpm version  indicates that we are patching python 2.7.5, however there are at least 58 patches
+added by Centos to fix issues fixed in the later python 2.7 releases.
+

devtools/python/python-2.7.5/centos/build_srpm.data

@@ -0,0 +1 @@
+TIS_PATCH_VER=3

devtools/python/python-2.7.5/centos/meta_patches/0001-Update-package-versioning-for-TIS-format.patch

@@ -0,0 +1,25 @@
+From e9bc5d92bb0ee327015626072fee83f12018712c Mon Sep 17 00:00:00 2001
+From: Al Bailey <Al.Bailey@windriver.com>
+Date: Tue, 27 Mar 2018 12:38:50 -0500
+Subject: [PATCH] Update package versioning for TIS format
+
+---
+ SPECS/python.spec | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/SPECS/python.spec b/SPECS/python.spec
+index a9fd32f..62f21d4 100644
+--- a/SPECS/python.spec
++++ b/SPECS/python.spec
+@@ -106,7 +106,7 @@ Summary: An interpreted, interactive, object-oriented programming language
+ Name: %{python}
+ # Remember to also rebase python-docs when changing this:
+ Version: 2.7.5
+-Release: 58%{?dist}
++Release: 58.el7%{?_tis_dist}.%{tis_patch_ver}
+ License: Python
+ Group: Development/Languages
+ Requires: %{python}-libs%{?_isa} = %{version}-%{release}
+-- 
+1.8.3.1
+

devtools/python/python-2.7.5/centos/meta_patches/0002-Disable-unittest-check-phase.patch

@@ -0,0 +1,25 @@
+From 2f23c2c6194d828de7bede593926007802cca610 Mon Sep 17 00:00:00 2001
+From: Al Bailey <Al.Bailey@windriver.com>
+Date: Tue, 6 Mar 2018 18:21:48 -0600
+Subject: [PATCH] Disable unittest check phase
+
+---
+ SPECS/python.spec | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/SPECS/python.spec b/SPECS/python.spec
+index a9fd32f..1030c57 100644
+--- a/SPECS/python.spec
++++ b/SPECS/python.spec
+@@ -54,7 +54,7 @@
+ %global with_gdbm 1
+ 
+ # Turn this to 0 to turn off the "check" phase:
+-%global run_selftest_suite 1
++%global run_selftest_suite 0
+ 
+ # Some of the files below /usr/lib/pythonMAJOR.MINOR/test  (e.g. bad_coding.py)
+ # are deliberately invalid, leading to SyntaxError exceptions if they get
+-- 
+1.8.3.1
+

devtools/python/python-2.7.5/centos/meta_patches/0003-Make-Python-Faster.patch

@@ -0,0 +1,42 @@
+From ff1efc0b077c78bedead5fdc6792240806f5a97c Mon Sep 17 00:00:00 2001
+From: Al Bailey <Al.Bailey@windriver.com>
+Date: Wed, 28 Mar 2018 08:26:56 -0500
+Subject: [PATCH] Make Python Faster
+
+---
+ SPECS/python.spec | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/SPECS/python.spec b/SPECS/python.spec
+index adc6815..fadf838 100644
+--- a/SPECS/python.spec
++++ b/SPECS/python.spec
+@@ -1195,6 +1195,8 @@ Patch268: 00268-set-stream-name-to-None.patch
+ # above:
+ Patch5000: 05000-autotool-intermediates.patch
+ 
++Patch9000: Rollup-optimization-commits.patch
++
+ # ======================================================
+ # Additional metadata, and subpackages
+ # ======================================================
+@@ -1591,6 +1593,7 @@ find -name "*~" |xargs rm -f
+ %patch5000 -p0 -b .autotool-intermediates
+ %endif
+ 
++%patch9000 -p1
+ 
+ # ======================================================
+ # Configuring and building the code:
+@@ -1721,7 +1724,7 @@ BuildPython debug \
+ BuildPython optimized \
+   python \
+   python%{pybasever} \
+-  "" \
++   "--enable-optimizations --with-computed-gotos" \
+   true
+ 
+ 
+-- 
+1.8.3.1
+

devtools/python/python-2.7.5/centos/meta_patches/0004-Turn-off-with_systemtap-to-disable-dtrace.patch

@@ -0,0 +1,25 @@
+From 83b8eb17d13fd5afdb926698082e47cba029c531 Mon Sep 17 00:00:00 2001
+From: Al Bailey <Al.Bailey@windriver.com>
+Date: Wed, 28 Mar 2018 15:23:35 -0500
+Subject: [PATCH] Turn off with_systemtap to disable dtrace
+
+---
+ SPECS/python.spec | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/SPECS/python.spec b/SPECS/python.spec
+index 2441951..c2edce8 100644
+--- a/SPECS/python.spec
++++ b/SPECS/python.spec
+@@ -42,7 +42,7 @@
+ 
+ %global with_gdb_hooks 1
+ 
+-%global with_systemtap 1
++%global with_systemtap 0
+ 
+ # some arches don't have valgrind so we need to disable its support on them
+ %ifarch %{ix86} x86_64 ppc %{power64} s390x aarch64
+-- 
+1.8.3.1
+

devtools/python/python-2.7.5/centos/meta_patches/PATCH_ORDER

@@ -0,0 +1,4 @@
+0001-Update-package-versioning-for-TIS-format.patch
+0002-Disable-unittest-check-phase.patch
+0003-Make-Python-Faster.patch
+0004-Turn-off-with_systemtap-to-disable-dtrace.patch

devtools/python/python-2.7.5/centos/srpm_path

@@ -0,0 +1,2 @@
+mirror:Source/python-2.7.5-58.el7.src.rpm
+