From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Vasily Gorbik <gor@linux.ibm.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
Michal Marek <michal.lkml@markovi.net>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-s390@vger.kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 4/4] s390/ftrace: add -mfentry and -mnop-mcount support
Date: Tue, 7 Aug 2018 07:30:17 +0200 [thread overview]
Message-ID: <20180807053017.GA6613@osiris> (raw)
In-Reply-To: <patch-4.thread-aa7b8d.git-aa7b8dbf236f.your-ad-here.call-01533557518-ext-9465@work.hours>
On Mon, Aug 06, 2018 at 03:17:47PM +0200, Vasily Gorbik wrote:
> Utilize -mfentry and -mnop-mcount gcc options together with
> -mrecord-mcount to get compiler generated calls to the profiling functions
> as nops which are compatible with current -mhotpatch=0,3 approach. At the
> same time -mrecord-mcount enables __mcount_loc section generation by
> the compiler which allows to avoid using scripts/recordmcount.pl script.
>
> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
> ---
> arch/s390/Kconfig | 2 ++
> arch/s390/Makefile | 16 +++++++++-------
> arch/s390/include/asm/ftrace.h | 6 +++---
> arch/s390/kernel/ftrace.c | 2 +-
> arch/s390/kernel/mcount.S | 2 +-
> 5 files changed, 16 insertions(+), 12 deletions(-)
Do you have numbers which tell how much this reduces the compile time of
the kernel on s390? I assume this change makes quite some difference.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
next prev parent reply other threads:[~2018-08-07 7:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-06 13:17 [PATCH 0/4] ftrace build improvements Vasily Gorbik
2018-08-06 13:17 ` [PATCH 1/4] trace: handle CC_FLAGS_FTRACE more accurately Vasily Gorbik
2018-08-06 13:17 ` [PATCH 2/4] trace: avoid calling cc-option -mrecord-mcount for every Makefile Vasily Gorbik
2018-08-06 18:07 ` Andi Kleen
2018-08-07 11:59 ` Vasily Gorbik
2018-08-06 13:17 ` [PATCH 3/4] trace: add -mcount-nop option support Vasily Gorbik
2018-08-06 13:17 ` [PATCH 4/4] s390/ftrace: add -mfentry and -mnop-mcount support Vasily Gorbik
2018-08-07 5:30 ` Heiko Carstens [this message]
2018-08-08 11:10 ` Vasily Gorbik
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