linux-kernel - Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?

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Date:	Mon, 25 Apr 2011 14:30:02 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	paulmck@...ux.vnet.ibm.com, Mike Frysinger <vapier.adi@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?

2011/4/25 Bruno Prémont <bonbons@...ux-vserver.org>:
>
> Between 1-slabinfo and 2-slabinfo some values increased (a lot) while a few
> ones did decrease. Don't know which ones are RCU-affected and which ones are
> not.

It really sounds as if the tiny-rcu kthread somehow just stops
handling callbacks. The ones that keep increasing do seem to be all
rcu-free'd (but I didn't really check).

The thing is shown as running:

root         6  0.0  0.0      0     0 ?        R    22:14   0:00  \_
[rcu_kthread]

but nothing seems to happen and the CPU time hasn't increased at all.

I dunno. Makes no  sense to me, but yeah, I'm definitely blaming
tiny-rcu. Paul, any ideas?

                          Linus
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