From: Junio C Hamano <gitster@pobox.com>
To: Ted Ts'o <tytso@mit.edu>
Cc: git@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
Clemens Buchacher <drizzd@aon.at>
Subject: Re: [PATCH, RFC] Fix build problems related to profile-directed optimization
Date: Thu, 02 Feb 2012 16:58:09 -0800 [thread overview]
Message-ID: <7vvcnou40u.fsf@alter.siamese.dyndns.org> (raw)
In-Reply-To: <20120202201226.GA1032@thunk.org> (Ted Ts'o's message of "Thu, 2 Feb 2012 15:12:26 -0500")
Ted Ts'o <tytso@mit.edu> writes:
> ...
> At least in theory, it should be possible to have something which
> supports both PROFILE_GEN/PROFILE_USE as well as a combined
> PROFILE_BUILD.
>
> The hard part is that PROFILE_BUILD requires a multi-pass process; you
> need to build with one set of CFLAGS, then run the sample workload to
> get the data for your feedback directed optimizations, and then re-run
> the build with another set of CFLAGS.
Yeah, I can see how that forces us to some kludgy solution, but I tend to
agree that the separation between GEN/USE is a good thing.
> I think what we could to check
> for PROFILE_BUILD, and if it is set, do the first PROFILE_GEN / make
> test commands as part of the top-level Makefile's all: rule, and then
> do the normal build after that.
Yeah, something like that would emulate the "make profile-all" well enough
for people not to notice the change while giving us the flexibility of
GEN/USE separation. I kinda like it.
Thanks.
next prev parent reply other threads:[~2012-02-03 0:58 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-02 19:03 [PATCH, RFC] Fix build problems related to profile-directed optimization Theodore Ts'o
2012-02-02 20:02 ` Junio C Hamano
2012-02-02 20:12 ` Ted Ts'o
2012-02-02 20:14 ` Ted Ts'o
2012-02-03 0:58 ` Junio C Hamano [this message]
2012-02-03 2:07 ` Ted Ts'o
2012-02-03 6:00 ` Junio C Hamano
2012-02-03 18:19 ` Theodore Tso
2012-02-03 19:58 ` Junio C Hamano
2012-02-06 0:44 ` [PATCH] " Theodore Ts'o
2012-02-06 4:18 ` Jeff King
2012-02-06 5:57 ` Ted Ts'o
2012-02-06 6:00 ` Theodore Ts'o
2012-02-08 18:53 ` Ted Ts'o
2012-02-09 4:03 ` Junio C Hamano
2012-02-09 8:22 ` Johannes Sixt
2012-02-09 18:22 ` Junio C Hamano
2012-02-03 18:39 ` [PATCH, RFC] " Andi Kleen
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