linux-kernel - Re: [PATCH 1/3] slub: set a criteria for slub node partial adding

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Date:	Fri, 2 Dec 2011 14:02:28 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
cc:	Alex Shi <alex.shi@...el.com>, penberg@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] slub: set a criteria for slub node partial adding

On Fri, 2 Dec 2011, Eric Dumazet wrote:

> netperf (loopback or ethernet) is a known stress test for slub, and your
> patch removes code that might hurt netperf, but benefit real workload.
>
> Have you tried instead this far less intrusive solution ?
>
> if (tail == DEACTIVATE_TO_TAIL ||
>     page->inuse > page->objects / 4)
>          list_add_tail(&page->lru, &n->partial);
> else
>          list_add(&page->lru, &n->partial);

One could also move this logic to reside outside of the call to
add_partial(). This is called mostly from __slab_free() so the logic could
be put in there.

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