Date: Wed, 4 Jan 2006 00:26:35 -0500
From: Dave Jones <davej@redhat.com>
To: Keith Owens <kaos@ocs.com.au>
Cc: Matt Mackall <mpm@selenic.com>, linux-kernel@vger.kernel.org
Subject: Re: [POLL] SLAB : Are the 32 and 192 bytes caches really usefull on x86_64 machines ?
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	Keith Owens <kaos@ocs.com.au>, Matt Mackall <mpm@selenic.com>,
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References: <20051229012915.GB3286@redhat.com> <23471.1135821010@ocs3.ocs.com.au>
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On Thu, Dec 29, 2005 at 12:50:10PM +1100, Keith Owens wrote:
 > Dave Jones (on Wed, 28 Dec 2005 20:29:15 -0500) wrote:
 > >
 > > > Something like this:
 > > > 
 > > > http://lwn.net/Articles/124374/
 > >
 > >One thing that really sticks out like a sore thumb is soft_cursor()
 > >That thing gets called a *lot*, and every time it does a kmalloc/free
 > >pair that 99.9% of the time is going to be the same size alloc as
 > >it was the last time.  This patch makes that alloc persistent
 > >(and does a realloc if the size changes).
 > >The only time it should change is if the font/resolution changes I think.
 > 
 > Can soft_cursor() be called from multiple processes at the same time,
 > in particular with dual head systems?  If so then a static variable is
 > not going to work.

I looked at this a little closer. If my understanding of the console/fb layers
is correct, soft_cursor() is serialised by the console_sem in
drivers/video/console/fbcon.c::fb_flashcursor()

		Dave
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