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Date: Sat, 12 Apr 2008 20:16:01 +0200
From: Roman Divacky <rdivacky@FreeBSD.org>
To: Robert Watson <rwatson@FreeBSD.org>
Message-ID: <20080412181601.GA14472@freebsd.org>
References: <48002444.4030505@elischer.org>
	<20080412191300.E7693@fledge.watson.org>
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Cc: Julian Elischer <julian@elischer.org>,
	FreeBSD Current <current@FreeBSD.org>
Subject: Re: stack hogs in kernel
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On Sat, Apr 12, 2008 at 07:14:21PM +0100, Robert Watson wrote:
> 
> On Fri, 11 Apr 2008, Julian Elischer wrote:
> 
> >0xc05667e3 kldstat [kernel]:				2100
> >0xc07214f8 sendsig [kernel]:				1416
> >0xc04fb426 ugenread [kernel]:				1200
> >0xc070616b ipmi_smbios_identify [kernel]:		1136
> >0xc050bd26 usbd_new_device [kernel]:			1128
> >0xc0525a83 pfs_readlink [kernel]:			1092
> >0xc04fb407 ugenwrite [kernel]:				1056
> >0xc055ea33 prison_enforce_statfs [kernel]:		1044
> 
> This one, at least, is due to an issue Roman pointed out on hackers@ in the 
> last 24 hours -- a MAXPATHLEN sized buffer on the stack.  Looks like 
> pfs_readlink() has the same issue.

I plan to look at some of the MAXPATHLEN usage... I guess we can shave a few
tens of KBs from the kernel (static size and runtime size).

roman