From: Pavel Emelyanov <xemul@parallels.com>
To: "Serge E. Hallyn" <serge.hallyn@canonical.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linux Containers <containers@lists.osdl.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] user_ns: Improve the user_ns on-the-slab packaging
Date: Tue, 07 Dec 2010 17:33:04 +0300 [thread overview]
Message-ID: <4CFE45A0.8070408@parallels.com> (raw)
In-Reply-To: <20101207142747.GB4674@hallyn.com>
On 12/07/2010 05:27 PM, Serge E. Hallyn wrote:
> Quoting Pavel Emelyanov (xemul@parallels.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?
How many hundreds are you interested in? :) 128 users didn't
reveal any regressions.
> -serge
>
next prev parent reply other threads:[~2010-12-07 14:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-07 14:12 [PATCH] user_ns: Improve the user_ns on-the-slab packaging Pavel Emelyanov
2010-12-07 14:27 ` Serge E. Hallyn
2010-12-07 14:33 ` Pavel Emelyanov [this message]
2010-12-07 14:50 ` Serge E. Hallyn
2010-12-07 22:13 ` Andrew Morton
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