lkml.org 
[lkml]   [2018]   [Aug]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4/4] s390/ftrace: add -mfentry and -mnop-mcount support
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>

\
 
 \ /
  Last update: 2018-08-07 07:31    [W:0.083 / U:7.652 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site