linux-kernel - Re: [PATCH] user_ns: Improve the user

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Message-ID: <20101207142747.GB4674@hallyn.com>
Date:	Tue, 7 Dec 2010 08:27:47 -0600
From:	"Serge E. Hallyn" <serge.hallyn@...onical.com>
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Containers <containers@...ts.osdl.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] user_ns: Improve the user_ns on-the-slab packaging

Quoting Pavel Emelyanov (xemul@...allels.com):
> Currently on 64-bit arch the user_namespace is 2096 and when
> being kmalloc-ed it resides on a 4k slab wasting 2003 bytes.
> 
> If we allocate a separate cache for it and reduce the hash size
> from 128 to 64 chains the packaging becomes *much* better - the

Hey Pavel,

I trust you've done some performance tests and found no
regressions with a few hundred users?

-serge
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