On 22 January 2018 at 10:20, Koen Vandeputte <koen.vandepu...@ncentric.com> wrote: > > > On 2018-01-21 13:37, Jonas Gorski wrote: >> >> Hi, >> >> On 18 January 2018 at 10:50, Koen Vandeputte >> <koen.vandepu...@ncentric.com> wrote: >>> >>> A lot of targets have more than sufficient space to allow >>> building the kernel for speed iso size. >>> >>> Export this performance option to the main config: >>> >>> - Making it easy accessable for users >>> - Discarding the need to adjust it in the kernel config each time >>> when building from scratch and only using "make oldconfig" >>> >>> Compiling for size is still the default. >> >> This would be a "regression" for layerscape, as this target sets >> CC_OPTIMIZE_FOR_PERFORMANCE to y. >> >>> Purely informational: >>> >>> On my cns3xxx board, kernel size increases by ~100kB >>> but boot time decreased by ~8%. >>> >>> Signed-off-by: Koen Vandeputte <koen.vandepu...@ncentric.com> >>> --- >>> config/Config-kernel.in | 16 ++++++++++++++++ >>> 1 file changed, 16 insertions(+) >>> >>> diff --git a/config/Config-kernel.in b/config/Config-kernel.in >>> index fa06b5044219..b98c5dd04591 100644 >>> --- a/config/Config-kernel.in >>> +++ b/config/Config-kernel.in >>> @@ -194,6 +194,22 @@ config KERNEL_DEBUG_GPIO >>> bool "Compile the kernel with gpio debugging" >>> select KERNEL_DEBUG_KERNEL >>> >>> +config KERNEL_CC_OPTIMIZE_FOR_PERFORMANCE >>> + bool >>> + default y if COMPILE_KERNEL_FOR_SPEED >>> + default n >>> + >>> +config KERNEL_CC_OPTIMIZE_FOR_SIZE >>> + bool >>> + default n if COMPILE_KERNEL_FOR_SPEED >>> + default y >>> + >>> +config COMPILE_KERNEL_FOR_SPEED >>> + bool "Optimize the kernel for speed instead of size" >>> + default n >>> + help >>> + This will compile your kernel for maximum speed (-O2) instead >>> of smaller size (-Os) >> >> The kernel uses a choice here, so I think it would be better to just >> copy that. One less config option as well. > > Hi Jonas, > > Could you elaborate a bit more on this specific point? > I'm not quite fully understanding your proposal here.
See http://elixir.free-electrons.com/linux/latest/source/init/Kconfig#L1034 Regards Jonas _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev