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Date: Wed, 11 Apr 2007 11:33:43 -0400 From: Bill Davidsen <davidsen@....com> To: Eric Dumazet <dada1@...mosbay.com> CC: Maxim Uvarov <muvarov@...mvista.com>, linux-kernel@...r.kernel.org, randy.dunlap@...cle.com, Valdis.Kletnieks@...edu, jesper.juhl@...il.com Subject: Re: Performance Stats: Kernel patch Eric Dumazet wrote: > On Wed, 11 Apr 2007 15:59:16 +0400 > Maxim Uvarov <muvarov@...mvista.com> wrote: > > >> Patch adds Process Performance Statistics. >> It make available to the user the following >> new per-process (thread) performance statistics: >> * Involuntary Context Switches >> * Voluntary Context Switches >> * Number of system calls >> >> This data is useful for detecting hyperactivity >> patterns between processes. >> > > Your description is not very clear about the semantic of your stats. > > You currently returns stats only for thread(s) (not process as you claimed) > I'm not sure if you were confused by his use of thread in parenthesis, but isn't the whole point of this to see which threads are doing what? Or am I misreading his result as intentional? > Please check kernel/sys.c:k_getrusage() to see how getrusage() has to sum *lot* of individual fields to get precise process numbers (even counting stats for dead threads) > > -- bill davidsen <davidsen@....com> CTO TMR Associates, Inc Doing interesting things with small computers since 1979 - 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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