linux-kernel - Re: [PATCH] slub: limit number of slabs to scan in count

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Date: Mon, 15 Apr 2024 09:20:29 -0700 (PDT)
From: "Christoph Lameter (Ampere)" <cl@...ux.com>
To: Jianfeng Wang <jianfeng.w.wang@...cle.com>
cc: Vlastimil Babka <vbabka@...e.cz>, 
    "linux-mm@...ck.org" <linux-mm@...ck.org>, 
    "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
    "penberg@...nel.org" <penberg@...nel.org>, 
    "rientjes@...gle.com" <rientjes@...gle.com>, 
    "iamjoonsoo.kim@....com" <iamjoonsoo.kim@....com>, 
    "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, 
    Junxiao Bi <junxiao.bi@...cle.com>
Subject: Re: [PATCH] slub: limit number of slabs to scan in count_partial()

On Sat, 13 Apr 2024, Jianfeng Wang wrote:

>>>>>> kmem_cache_shrink() will explicitly sort the partial lists to put the
>>>>>> partial pages in that order.
>>>>>>
>
> Realized that I’d do "echo 1 > /sys/kernel/slab/dentry/shrink” to sort the list explicitly.
> After that, the numbers become:
> N = 10000 -> diff = 7.1 %
> N = 20000 -> diff = 5.7 %
> N = 25000 -> diff = 5.4 %
> So, expecting ~5-7% difference after shrinking.

That still looks ok to me.