Messages in this thread | | | Date | Mon, 24 Feb 2020 01:29:09 +0000 (UTC) | From | Christopher Lameter <> | Subject | Re: [PATCH] mm/slub: improve count_partial() for CONFIG_SLUB_CPU_PARTIAL |
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On Sat, 22 Feb 2020, Wen Yang wrote:
> We also observed that in this scenario, CONFIG_SLUB_CPU_PARTIAL is turned > on by default, and count_partial() is useless because the returned number > is far from the reality.
Well its not useless. Its just not counting the partial objects in per cpu partial slabs. Those are counted by a different counter it.
> Therefore, we can simply return 0, then nr_free is also 0, and eventually > active_objects == total_objects. We do not introduce any regression, and > it's preferable to show the unrealistic uniform 100% slab utilization > rather than some very high but incorrect value.
I suggest that you simply use the number of partial slabs and multiply them by the number of objects in a slab and use that as a value. Both values are readily available via /sys/kernel/slab/<...>/
You dont need a patch to do that.
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