linux-kernel - Re: [PATCH 5/6] riscv: allow kmalloc() caches aligned to the smallest value

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Message-ID: <ZHXJDevEVwUEoOq4@arm.com>
Date:   Tue, 30 May 2023 10:59:41 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Jisheng Zhang <jszhang@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] riscv: allow kmalloc() caches aligned to the
 smallest value

On Mon, May 29, 2023 at 12:17:46PM +0100, Conor Dooley wrote:
> On Sat, May 27, 2023 at 12:59:57AM +0800, Jisheng Zhang wrote:
> > After this patch, a simple test of booting to a small buildroot rootfs
> > on qemu shows:
> > 
> > kmalloc-96           5041    5041     96  ...
> > kmalloc-64           9606    9606     64  ...
> > kmalloc-32           5128    5128     32  ...
> > kmalloc-16           7682    7682     16  ...
> > kmalloc-8           10246   10246      8  ...
> > 
> > So we save about 1268KB memory. The saving will be much larger in normal
> > OS env on real HW platforms.
> > 
> > [1] Link: https://lore.kernel.org/linux-arm-kernel/20230524171904.3967031-1-catalin.marinas@arm.com/
> > 
> > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> 
> Fails to build chief, with loads of:
> linux/dma-mapping.h:546:19: error: redefinition of 'dma_get_cache_alignment'
> 
> And for 32-bit there's also a rake of:
> include/linux/slab.h:239:9: warning: 'ARCH_KMALLOC_MINALIGN' macro redefined [-Wmacro-redefined]
> 
> At the very least, reproducable with rv32_defconfig.

Have you this it on top of the KMALLOC_MINALIGN preparation series?

https://lore.kernel.org/r/20230524171904.3967031-1-catalin.marinas@arm.com/

-- 
Catalin