From: Peter Zijlstra <peterz@infradead.org>
To: Paul Turner <pjt@google.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Chris Friesen <cfriesen@nortel.com>,
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
Pierre Bourdon <pbourdon@excellency.fr>,
Bharata B Rao <bharata@linux.vnet.ibm.com>,
Karl Rister <kmr@us.ibm.com>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
David Miller <davem@davemloft.net>
Subject: Re: [tg_shares_up rewrite v3 09/11] sched: demand based update_cfs_load()
Date: Fri, 12 Nov 2010 13:12:39 +0100 [thread overview]
Message-ID: <1289563959.2084.241.camel@laptop> (raw)
In-Reply-To: <1289559198.2084.214.camel@laptop>
On Fri, 2010-11-12 at 11:53 +0100, Peter Zijlstra wrote:
> On Thu, 2010-11-11 at 19:24 -0800, Paul Turner wrote:
> > +#ifdef CONFIG_FAIR_GROUP_SCHED
> > + cfs_rq->load_unacc_exec_time += delta_exec;
> > + if (cfs_rq->load_unacc_exec_time > sysctl_sched_shares_window)
> > {
> > + update_cfs_load(cfs_rq);
> > + update_cfs_shares(cfs_rq, 0);
>
> Why not:
> + cfs_rq->load_unacc_exec_time -= sysctl_sched_shares_window;
>
> (although you probably want to read the sysctl value into a local
> variable using ACCESS_ONCE() and use that for both cases).
Ah, I see why not, still that reset looks better here than in that other
function.
next prev parent reply other threads:[~2010-11-12 12:13 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-12 3:24 [tg_shares_up rewrite v3 00/11] reduce overhead for tg->shares distribution Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 01/11] sched: rewrite tg_shares_up Paul Turner
2010-11-12 11:10 ` Peter Zijlstra
2010-11-12 3:24 ` [tg_shares_up rewrite v3 02/11] sched: on-demand (active) cfs_rq list Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 03/11] sched: make tg_shares_up() walk on-demand Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 04/11] sched: fix load corruption from update_cfs_shares Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 05/11] sched: fix update_cfs_load synchronization Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 06/11] sched: hierarchal order on shares update list Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 07/11] sched: add sysctl_sched_shares_window Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 08/11] sched: update shares on idle_balance Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 09/11] sched: demand based update_cfs_load() Paul Turner
2010-11-12 10:53 ` Peter Zijlstra
2010-11-12 12:12 ` Peter Zijlstra [this message]
2010-11-13 1:01 ` Paul Turner
2010-11-13 2:42 ` Paul Turner
2010-11-13 22:45 ` Peter Zijlstra
2010-11-12 3:24 ` [tg_shares_up rewrite v3 10/11] sched: allow update_cfs_load to update global load Paul Turner
2010-11-12 3:24 ` [tg_shares_up rewrite v3 11/11] sched: update tg->shares after cpu.shares write Paul Turner
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