linux-kernel - Re: Deprecating and removing SLOB

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Date:   Fri, 11 Nov 2022 11:25:46 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Conor.Dooley@...rochip.com
Cc:     cl@...ux.com, rientjes@...gle.com, iamjoonsoo.kim@....com,
        penberg@...nel.org, 42.hyeyoo@...il.com, willy@...radead.org,
        roman.gushchin@...ux.dev, pasha.tatashin@...een.com,
        torvalds@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, catalin.marinas@....com,
        rkovhaev@...il.com, akpm@...ux-foundation.org
Subject: Re: Deprecating and removing SLOB

On 11/10/22 00:00, Damien Le Moal wrote:
> On 11/10/22 02:57, Conor.Dooley@...rochip.com wrote:
>> +CC Damien
>> 
>>> There are some devices with configs where SLOB is enabled by default.
>>> Perhaps, the owners/maintainers of those devices/configs should be
>>> included into this thread:
>>>
>>> tatashin@...een:~/x/linux$ git grep SLOB=y
>> 
>>> arch/riscv/configs/nommu_k210_defconfig:CONFIG_SLOB=y
>>> arch/riscv/configs/nommu_k210_sdcard_defconfig:CONFIG_SLOB=y
>>> arch/riscv/configs/nommu_virt_defconfig:CONFIG_SLOB=y
>> 
>> Saw you were not added to the CC Damien & I know you don't want your
>> baby broken!
> 
> :)
> 
> I set SLOB=y for the K210 as the config help mentions it is a bit more
> efficient in low memory cases. I did run a few times with SLAB and it
> was OK, so removing slob should not be a problem. Can check again.

Thanks, but please check with SLUB, not SLAB, if possible.
Disable SLUB_CPU_PARTIAL (default y on SMP) if you want to minimize the
memory usage.