# [PATCH] Add explanation of the profile feedback build to the README

1 messages from 2011-06-20 to 2011-06-20. Participants: Andi Kleen.
Thread: https://gitlist.dev/t/27667

## Andi Kleen, 2011-06-20 22:41

Subject: [PATCH] Add explanation of the profile feedback build to the README
Message-ID: <1308609661-28650-1-git-send-email-andi@firstfloor.org>
URL: https://gitlist.dev/e/1308609661-28650-1-git-send-email-andi%40firstfloor.org

```
From: Andi Kleen <ak@linux.intel.com>

Also explains that the are additional warnings.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 INSTALL |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/INSTALL b/INSTALL
index 16e45f1..bbb9d4d 100644
--- a/INSTALL
+++ b/INSTALL
@@ -25,6 +25,19 @@ set up install paths (via config.mak.autogen), so you can write instead
 	$ make all doc ;# as yourself
 	# make install install-doc install-html;# as root
 
+If you're willing to trade off (much) longer build time for a later
+faster git you can also do a profile feedback build with
+
+	$ make profile-all
+	# make prefix=... install
+
+This will run the complete test suite as training workload and then
+rebuild git with the generated profile feedback. This results in a git
+which is a few percent faster on CPU intensive workloads.  This
+may be a good tradeoff for distribution packagers.
+
+Note that the profile feedback build stage currently generates
+a lot of additional compiler warnings.
 
 Issues of note:
 
-- 
1.7.4.4

```