Messages in this thread | | | Subject | Re: [Patch 5/7] synchronous block I/O delays | From | Arjan van de Ven <> | Date | Mon, 27 Feb 2006 10:24:50 +0100 |
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On Mon, 2006-02-27 at 04:13 -0500, Shailabh Nagar wrote: > Arjan van de Ven wrote: > > >>+static inline void delayacct_blkio(void) > >>+{ > >>+ if (unlikely(current->delays && delayacct_on)) > >>+ __delayacct_blkio(); > >>+} > >> > >> > > > >why is this unlikely? > > > > > delayacct_on is expected to be off most of the time, hence the compound is > unlikely too.
ok that opens the question: why is this a runtime tunable? Is it really worth all this complexity?
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