linux-kernel - Re: Major regression on hackbench with SLUB (more numbers)

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Message-ID: <20071224233701.GB9784@kernel.org>
Date:	Mon, 24 Dec 2007 18:37:01 -0500
From:	Theodore Tso <tytso@....edu>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, Willy Tarreau <w@....eu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Major regression on hackbench with SLUB (more numbers)

On Mon, Dec 24, 2007 at 11:21:14AM -0800, Christoph Lameter wrote:
> 
> That is why there is a slabinfo tool that does all the nice formatting.
> 
> Do a
> 
> gcc -o slabinfo Documentation/vm/slabinfo.c 
> 
> Then run slabinfo instead of doing cat /proc/slabinfo

So two questions: why isn't -f the default?  And is /sys/slab
guaranteed to be a stable and permanent interface if the SLAB
implementation ever gets ripped out?  If so, maybe this should go into
util-linux-ng?  I am aa bit concerned about the lack of atomicity of
/sys/slab, but this is a heck of a lot better of many kernel drivers
or subsystems which use /sys and the completely punt on any kind of
userspace utility, forcing users to type crazy things like 

  echo 5 > /sys/bus/pci/drivers/iwl4965/*/power_level

						- Ted
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