From: Eric Dumazet <dada1@cosmosbay.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Dipankar Sarma <dipankar@in.ibm.com>,
Jean Delvare <khali@linux-fr.org>,
Serge Belyshev <belyshev@depni.sinp.msu.ru>,
LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
Manfred Spraul <manfred@colorfullife.com>
Subject: Re: VFS: file-max limit 50044 reached
Date: Mon, 17 Oct 2005 18:01:31 +0200 [thread overview]
Message-ID: <4353CADB.8050709@cosmosbay.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0510170829000.23590@g5.osdl.org>
Linus Torvalds a écrit :
> So I suspect that the _real_ fix is:
>
> - for 2.6.14: remove the batching limig (or just make it much higher for
> now)
I would just remove it. If the limit is wrong, we crash again. And the
realtime guys already are pissed off by batch=10000 anyway.
>
> - post-14: work on making sure rcu callbacks are done in a more timely
> manner when the rcu queue gets long. This would involve TIF_RCUPENDING
> and whatever else to make sure that we have timely quiescent periods,
> and we do the RCU callback tasklet more often if the queue is long.
>
Absolutely. Keeping a count of (percpu) queued items is basically free if kept
in the cache line used by list head, so the 'queue length on this cpu' is a
cheap metric.
A 'realtime refinement' would be to use a different maxbatch limit depending
on the caller's priority : Let a softirq thread have a lower batch count than
a regular user thread.
Eric
next prev parent reply other threads:[~2005-10-17 16:02 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-15 13:19 VFS: file-max limit 50044 reached Serge Belyshev
2005-10-15 17:53 ` Serge Belyshev
2005-10-16 16:23 ` Dipankar Sarma
2005-10-16 18:51 ` Serge Belyshev
2005-10-16 18:56 ` Dipankar Sarma
2005-10-17 2:19 ` Linus Torvalds
2005-10-17 4:43 ` Serge Belyshev
2005-10-17 8:32 ` Jean Delvare
2005-10-17 8:46 ` Dipankar Sarma
2005-10-17 9:10 ` Eric Dumazet
2005-10-17 9:14 ` Christoph Hellwig
2005-10-17 9:25 ` Eric Dumazet
2005-10-17 10:32 ` Dipankar Sarma
2005-10-17 12:10 ` [RCU problem] was " Eric Dumazet
2005-10-17 12:31 ` linux-os (Dick Johnson)
2005-10-17 12:36 ` Dipankar Sarma
2005-10-17 13:28 ` Eric Dumazet
2005-10-17 13:33 ` Dipankar Sarma
2005-10-17 14:54 ` Eric Dumazet
2005-10-17 15:42 ` Linus Torvalds
2005-10-17 16:01 ` Eric Dumazet [this message]
2005-10-17 16:16 ` Linus Torvalds
2005-10-17 16:29 ` Dipankar Sarma
2005-10-17 18:01 ` Eric Dumazet
2005-10-17 18:31 ` Dipankar Sarma
2005-10-17 19:00 ` Linus Torvalds
2005-10-17 18:37 ` Linus Torvalds
2005-10-17 19:12 ` Eric Dumazet
2005-10-17 19:30 ` Linus Torvalds
2005-10-17 19:39 ` Eric Dumazet
2005-10-17 20:14 ` Linus Torvalds
2005-10-17 20:25 ` Christopher Friesen
2005-10-17 20:24 ` Dipankar Sarma
2005-10-18 15:55 ` Christopher Friesen
2005-10-17 20:38 ` Linus Torvalds
2005-10-17 20:33 ` Dipankar Sarma
2005-10-17 22:40 ` Linus Torvalds
2005-10-17 22:59 ` Paul E. McKenney
2005-10-18 9:46 ` Eric Dumazet
2005-10-18 16:22 ` Paul E. McKenney
2005-10-17 18:15 ` Dipankar Sarma
2005-10-17 18:40 ` Linus Torvalds
2005-10-17 16:23 ` Dipankar Sarma
2005-10-17 16:31 ` Lee Revell
2005-10-17 16:20 ` Dipankar Sarma
2005-10-17 2:34 ` Linus Torvalds
2005-10-17 3:54 ` Roland Dreier
2005-10-17 11:54 ` Dipankar Sarma
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