2022-09-09 10:20:43

by Alexander Sverdlin

[permalink] [raw]
Subject: [PATCH v2] mips: Select SPARSEMEM_EXTREME

From: Alexander Sverdlin <[email protected]>

Commit c46173183657 ("MIPS: Add NUMA support for Loongson-3") has increased
.bss size of the Octeon kernel from 16k to 16M. Providing the conditions
for SPARSEMEM_EXTREME avoids the waste of memory.

Thomas has tested the loogsoon64 kernel, where .bss is being reduced by
this patch from 16.5M to 515k.

Cc: Thomas Bogendoerfer <[email protected]>
Signed-off-by: Alexander Sverdlin <[email protected]>
---
arch/mips/Kconfig | 1 -
1 file changed, 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index ec21f89..25dd4c5 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2669,7 +2669,6 @@ config ARCH_FLATMEM_ENABLE

config ARCH_SPARSEMEM_ENABLE
bool
- select SPARSEMEM_STATIC if !SGI_IP27

config NUMA
bool "NUMA Support"
--
2.10.2


2022-09-09 16:15:17

by Thomas Bogendoerfer

[permalink] [raw]
Subject: Re: [PATCH v2] mips: Select SPARSEMEM_EXTREME

On Fri, Sep 09, 2022 at 11:30:42AM +0200, Alexander A Sverdlin wrote:
> From: Alexander Sverdlin <[email protected]>
>
> Commit c46173183657 ("MIPS: Add NUMA support for Loongson-3") has increased
> .bss size of the Octeon kernel from 16k to 16M. Providing the conditions
> for SPARSEMEM_EXTREME avoids the waste of memory.
>
> Thomas has tested the loogsoon64 kernel, where .bss is being reduced by
> this patch from 16.5M to 515k.
>
> Cc: Thomas Bogendoerfer <[email protected]>
> Signed-off-by: Alexander Sverdlin <[email protected]>
> ---
> arch/mips/Kconfig | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index ec21f89..25dd4c5 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -2669,7 +2669,6 @@ config ARCH_FLATMEM_ENABLE
>
> config ARCH_SPARSEMEM_ENABLE
> bool
> - select SPARSEMEM_STATIC if !SGI_IP27
>
> config NUMA
> bool "NUMA Support"
> --
> 2.10.2

thank for the change, applied to mips-fixes.

Thomas.

--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]