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Message-ID: <20130108181205.GE29933@redhat.com> Date: Tue, 8 Jan 2013 13:12:05 -0500 From: Vivek Goyal <vgoyal@...hat.com> To: Tejun Heo <tj@...nel.org> Cc: lizefan@...wei.com, axboe@...nel.dk, containers@...ts.linux-foundation.org, cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, ctalbott@...gle.com, rni@...gle.com Subject: Re: [PATCH 23/24] cfq-iosched: collect stats from dead cfqgs On Fri, Dec 28, 2012 at 12:35:45PM -0800, Tejun Heo wrote: > To support hierarchical stats, it's necessary to remember stats from > dead children. Add cfqg->dead_stats and make a dying cfqg transfer > its stats to the parent's dead-stats. > > The transfer happens form ->pd_offline_fn() and it is possible that > there are some residual IOs completing afterwards. Currently, we lose > these stats. Given that cgroup removal isn't a very high frequency > operation and the amount of residual IOs on offline are likely to be > nil or small, this shouldn't be a big deal and the complexity needed > to handle residual IOs - another callback and rather elaborate > synchronization to reach and lock the matching q - doesn't seem > justified. > > Signed-off-by: Tejun Heo <tj@...nel.org> Acked-by: Vivek Goyal <vgoyal@...hat.com> Vivek -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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