From: Dipankar Sarma <dipankar@in.ibm.com>
To: David Lang <dlang@digitalinsight.com>
Cc: Linus Torvalds <torvalds@osdl.org>,
Lee Revell <rlrevell@joe-job.com>,
paulmck@us.ibm.com, Ingo Molnar <mingo@elte.hu>,
Dave Jones <davej@redhat.com>, Hugh Dickins <hugh@veritas.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Eric Dumazet <dada1@cosmosbay.com>,
vatsa@in.ibm.com
Subject: Re: [patch] latency tracer, 2.6.15-rc7
Date: Tue, 3 Jan 2006 19:41:01 +0530 [thread overview]
Message-ID: <20060103141101.GC5075@in.ibm.com> (raw)
In-Reply-To: <Pine.LNX.4.62.0601030524570.30559@qynat.qvtvafvgr.pbz>
On Tue, Jan 03, 2006 at 05:28:15AM -0800, David Lang wrote:
> On Tue, 3 Jan 2006, Dipankar Sarma wrote:
>
> >I do agree that the two layers of batching really makes things
> >subtle. I think the best we can do is to figure out some way of
> >automatic throttling in RCU and forced quiescent state under extreme
> >conditions. That way we will have less dependency on softirq
> >throttling.
>
> would it make sense to have the RCU subsystems with a threshold so that
> when more then X items are outstanding they trigger a premption of all
> other CPU's ASAP (forceing the scheduling break needed to make progress on
> clearing RCU)? This wouldn't work in all cases, but it could significantly
> reduce the problem situations.
Yes, I think it would make sense to try something like that. See Paul's earlier
mail in this thread for an example code snippet.
Thanks
Dipankar
next prev parent reply other threads:[~2006-01-03 14:10 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-27 23:31 2.6.15-rc5: latency regression vs 2.6.14 in exit_mmap->free_pgtables Lee Revell
2005-12-28 2:46 ` Lee Revell
2005-12-28 22:59 ` Hugh Dickins
2005-12-29 0:00 ` Lee Revell
2005-12-29 8:22 ` [patch] latency tracer, 2.6.15-rc7 Ingo Molnar
2005-12-29 10:02 ` Dave Jones
2005-12-29 10:17 ` Ingo Molnar
2005-12-29 20:11 ` Lee Revell
2005-12-29 20:26 ` Lee Revell
2005-12-29 20:28 ` Ingo Molnar
2005-12-29 22:18 ` Lee Revell
2005-12-30 0:08 ` Grant Coady
2005-12-30 0:18 ` Lee Revell
2005-12-30 0:42 ` Grant Coady
2005-12-30 8:09 ` Ingo Molnar
2005-12-30 16:51 ` Linus Torvalds
2006-01-02 20:14 ` Ingo Molnar
2006-01-19 1:49 ` Lee Revell
2006-01-19 6:17 ` Lee Revell
2005-12-31 0:20 ` Grant Coady
2005-12-30 2:16 ` Lee Revell
2005-12-30 8:00 ` Ingo Molnar
2005-12-30 18:51 ` Lee Revell
2005-12-31 0:51 ` Lee Revell
2005-12-31 0:59 ` Mark Knecht
2005-12-31 1:16 ` Lee Revell
2005-12-31 1:30 ` Lee Revell
2005-12-31 1:02 ` Linus Torvalds
2005-12-31 1:15 ` Lee Revell
2005-12-31 1:39 ` Linus Torvalds
2005-12-31 3:54 ` Lee Revell
2005-12-31 4:00 ` Lee Revell
2005-12-31 4:29 ` Paul E. McKenney
2005-12-31 4:54 ` Lee Revell
2005-12-31 20:14 ` Paul E. McKenney
2006-01-01 5:46 ` Lee Revell
2006-01-01 18:56 ` Linus Torvalds
2006-01-01 19:02 ` Lee Revell
2006-01-01 19:06 ` Lee Revell
2006-01-03 11:12 ` Dipankar Sarma
2006-01-03 13:28 ` David Lang
2006-01-03 14:11 ` Dipankar Sarma [this message]
2006-01-03 14:09 ` Dipankar Sarma
2006-01-03 15:55 ` Paul E. McKenney
2005-12-31 4:48 ` Linus Torvalds
2006-01-01 8:32 ` Lee Revell
2006-01-06 20:28 ` Lee Revell
2005-12-29 0:54 ` 2.6.15-rc5: latency regression vs 2.6.14 in exit_mmap->free_pgtables Lee Revell
2006-01-19 1:42 ` Lee Revell
2006-01-19 7:29 ` Hugh Dickins
2006-01-19 7:32 ` Lee Revell
2006-01-19 7:35 ` Lee Revell
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