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Message-Id: <200908311441.28354.knikanth@suse.de> Date: Mon, 31 Aug 2009 14:41:28 +0530 From: Nikanth Karthikesan <knikanth@...e.de> To: Guillaume Chazarain <guichaz@...il.com> Cc: balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org, procps-feedback@...ts.sf.net, Albert Cahalan <albert@...rs.sf.net> Subject: Re: [PATCH 1/3] taskstats-fork: Add a new taskstats command to get notification on fork/clone On Monday 31 August 2009 01:22:22 Guillaume Chazarain wrote: > On Tue, Jul 21, 2009 at 8:24 AM, Nikanth Karthikesan<knikanth@...e.de> wrote: > > Ah.. proc-events was the exact thing, I was looking for! Thanks. > > AFAICT proc-events can only be used by root, so that makes it > unsuitable for *top. > > Anyway, iotop will always have to iterate over all threads to query > their taskstats and other attributes, so the O(nr_threads) complexity > is unavoidable. > If it would simply iterate over all the current threads, the complexity would be O(nr_threads). But while iterating through all the current threads, it checks whether it is a new thread or a known thread, so that it can calculate the delta values. This is what I optimized by using taskstats-fork, which could be optimized using proc-events. Thanks Nikanth -- 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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