[PATCH] Add explanation of the profile feedback build to the README
From: Andi Kleen <hidden>
Date: 2016-06-15 22:51:30
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Andi Kleen <redacted> Also explains that the are additional warnings. Signed-off-by: Andi Kleen <redacted> --- 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:
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1.7.4.4