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From: Tim Hockin <thockin@sun.com>
To: Pete Zaitcev <zaitcev@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [BK PATCH 1/2] Remove NGROUPS hardlimit (resend w/o qsort)
Date: Thu, 14 Nov 2002 16:46:36 -0800	[thread overview]
Message-ID: <3DD443EC.2080504@sun.com> (raw)
In-Reply-To: 20021114193156.A2801@devserv.devel.redhat.com

Pete Zaitcev wrote:


> be about time to think about your data structures a little more.
> I'll let Andi to remind you about the performance impact (vmalloc
> area is outside of the big TLB area).

Offer an alternative?  :)  Linked list costs us as much or MORE for 
->next as the gid_t.  kmalloc() doesn't work for previous reasoning.  I 
considered a list of gid arr[256] or similar.  A voice reminds me that 
it doesn't impact us noticably in real use.  Now, maybe other 
architectures will find a good reason to switch to kmalloc() list of 
smaller arrays, and the associated complextities or something else more 
clever.

>>hmm, I haven't heard anything about them - can you offer an email or URL?

> http://www.uwsg.iu.edu/hypermail/linux/kernel/0010.0/0788.html

Thanks - will check it..


-- 
Tim Hockin
Systems Software Engineer
Sun Microsystems, Linux Kernel Engineering
thockin@sun.com


  reply	other threads:[~2002-11-15  0:39 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.1037316781.6599.linux-kernel2news@redhat.com>
2002-11-15  0:06 ` [BK PATCH 1/2] Remove NGROUPS hardlimit (resend w/o qsort) Pete Zaitcev
2002-11-15  0:14   ` Tim Hockin
2002-11-15  0:31     ` Pete Zaitcev
2002-11-15  0:46       ` Tim Hockin [this message]
2002-11-15  1:19         ` William Lee Irwin III
2002-11-15  1:45           ` Pete Zaitcev
2002-11-15  1:53             ` William Lee Irwin III
     [not found]         ` <3DD44742.2DFE4407@digeo.com>
2002-11-15  1:24           ` Tim Hockin
2002-11-15  1:30             ` Andrew Morton
2002-11-15  2:33               ` Tim Hockin
2002-11-15  2:41                 ` Andrew Morton
2002-11-15 15:13                   ` Alan Cox
2002-11-15  6:00               ` Aaron Lehmann
2002-11-15  1:04       ` Alan Cox
2002-11-15 13:32       ` Frank van Maarseveen
2002-11-14 23:26 Timothy Hockin
2002-11-15 16:30 ` Horst von Brand

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