linux-kernel - Re: Deprecating and removing SLOB

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Message-ID: <ba1d4796-b0ce-1a63-5f9d-c9da7392167d@opensource.wdc.com>
Date:   Sat, 12 Nov 2022 10:40:36 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Vlastimil Babka <vbabka@...e.cz>, 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 11/11/22 19:25, Vlastimil Babka wrote:
> 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.

Thanks for the hint. Will try that.

-- 
Damien Le Moal
Western Digital Research