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Date:   Mon, 11 Jan 2021 16:27:20 -0800
From:   Roman Gushchin <>
To:     Jann Horn <>
CC:     Christoph Lameter <>,
        Pekka Enberg <>,
        David Rientjes <>,
        Joonsoo Kim <>,
        Andrew Morton <>,
        Linux-MM <>,
        kernel list <>,
        Thomas Gleixner <>,
        Sebastian Andrzej Siewior <>,
        Johannes Weiner <>,
        Shakeel Butt <>,
        Suren Baghdasaryan <>,
        Minchan Kim <>
Subject: Re: SLUB: percpu partial object count is highly inaccurate, causing
 some memory wastage and maybe also worse tail latencies?

On Tue, Jan 12, 2021 at 12:12:47AM +0100, Jann Horn wrote:
> [This is not something I intend to work on myself. But since I
> stumbled over this issue, I figured I should at least document/report
> it, in case anyone is willing to pick it up.]

Hi, Jann!

Thank you very much for this report!

It should be less of a problem since 5.9, but still on a machine with
many CPUs a non-trivial amount of memory is wasted.

I'll definitely take a look.


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