linux-kernel - Re: [RFC 0/7] Slab object migration for xarray V2

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Message-ID: <e7a2e0a5-d5b7-a158-52a1-6aa230501a94@infradead.org>
Date:   Thu, 20 Dec 2018 14:32:14 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Christoph Lameter <cl@...ux.com>,
        Matthew Wilcox <willy@...radead.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Pekka Enberg <penberg@...helsinki.fi>,
        akpm@...ux-foundation.org, Mel Gorman <mel@...net.ie>,
        andi@...stfloor.org, Rik van Riel <riel@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Christoph Hellwig <hch@....de>, Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [RFC 0/7] Slab object migration for xarray V2

On 12/20/18 11:21 AM, Christoph Lameter wrote:
> To test apply this patchset and run a workload that uses lots of radix tree objects
> 
> 
> Then go to
> 
> /sys/kernel/slab/radix_tree_node
> 
> Inspect the number of total objects that the slab can handle
> 
> 	cat total_objects

	cat objects # ???

(as below) (just checking :)


> 
> qmdr:/sys/kernel/slab/radix_tree_node# cat objects
> 868 N0=448 N1=168 N2=56 N3=196
> 
> And the number of slab pages used for those
> 
> 	cat slabs
> 
> qmdr:/sys/kernel/slab/radix_tree_node# cat slabs
> 31 N0=16 N1=6 N2=2 N3=7
> 
> 
> Perform a cache shrink operation
> 
> 	echo 1 >shrink
> 
> 
> Now see how the slab has changed:
> 
> qmdr:/sys/kernel/slab/radix_tree_node# cat slabs
> 30 N0=15 N1=6 N2=2 N3=7
> qmdr:/sys/kernel/slab/radix_tree_node# cat objects
> 713 N0=349 N1=141 N2=52 N3=171


-- 
~Randy