| Message ID | 20201221083623.4156421-1-geert+renesas@glider.be (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 42d146227cd58aa996eefa88aa2bb36c3ef36e4e |
| Delegated to: | Geert Uytterhoeven |
| Headers | show |
| Series | [LOCAL] arm64: renesas: defconfig: Enable Transparent Hugepage madvise | expand |
Hi Geert > Enabling Transparent Hugepage always can increase the memory footprint > of applications without a guaranteed benefit. > > Documentation/admin-guide/mm/transhuge.rst says: > > Embedded systems should enable hugepages only inside madvise regions > to eliminate any risk of wasting any precious byte of memory and to > only run faster. > > Hence enable Transparent Hugepage madvise instead, which will only > provide a performance improvement benefit to the applications using > madvise(MADV_HUGEPAGE), but it won't risk to increase the memory > footprint of applications without a guaranteed benefit. > > Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> > --- Please add this Reported-by: Takanari Hayama <taki@igel.co.jp> Thank you for your help !! Best regards --- Kuninori Morimoto
diff --git a/arch/arm64/configs/renesas_defconfig b/arch/arm64/configs/renesas_defconfig index 71a6cb34ca89229c..f641a2675d0a425b 100644 --- a/arch/arm64/configs/renesas_defconfig +++ b/arch/arm64/configs/renesas_defconfig @@ -75,6 +75,7 @@ CONFIG_BLK_DEV_INTEGRITY=y # CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set CONFIG_KSM=y CONFIG_TRANSPARENT_HUGEPAGE=y +CONFIG_TRANSPARENT_HUGEPAGE_MADVISE=y CONFIG_CMA=y CONFIG_NET=y CONFIG_PACKET=y
Enabling Transparent Hugepage always can increase the memory footprint of applications without a guaranteed benefit. Documentation/admin-guide/mm/transhuge.rst says: Embedded systems should enable hugepages only inside madvise regions to eliminate any risk of wasting any precious byte of memory and to only run faster. Hence enable Transparent Hugepage madvise instead, which will only provide a performance improvement benefit to the applications using madvise(MADV_HUGEPAGE), but it won't risk to increase the memory footprint of applications without a guaranteed benefit. Suggested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- Not intended for upstream merge; to be applied to the topic/renesas-defconfig only. Perhaps this should be changed in arch/arm64/configs/defconfig, too? Perhaps the default should be changed in mm/Kconfig instead? --- arch/arm64/configs/renesas_defconfig | 1 + 1 file changed, 1 insertion(+)