Messages in this thread | | | Subject | Re: [PATCH] nfs: fix congestion control -v4 | From | Peter Zijlstra <> | Date | Fri, 26 Jan 2007 09:00:12 +0100 |
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On Thu, 2007-01-25 at 21:02 -0800, Andrew Morton wrote: > On Thu, 25 Jan 2007 16:32:28 +0100 > Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > > > +long congestion_wait_interruptible(int rw, long timeout) > > +{ > > + long ret; > > + DEFINE_WAIT(wait); > > + wait_queue_head_t *wqh = &congestion_wqh[rw]; > > + > > + prepare_to_wait(wqh, &wait, TASK_INTERRUPTIBLE); > > + if (signal_pending(current)) > > + ret = -ERESTARTSYS; > > + else > > + ret = io_schedule_timeout(timeout); > > + finish_wait(wqh, &wait); > > + return ret; > > +} > > +EXPORT_SYMBOL(congestion_wait_interruptible); > > I think this can share code with congestion_wait()? > > static long __congestion_wait(int rw, long timeout, int state) > { > long ret; > DEFINE_WAIT(wait); > wait_queue_head_t *wqh = &congestion_wqh[rw]; > > prepare_to_wait(wqh, &wait, state); > ret = io_schedule_timeout(timeout); > finish_wait(wqh, &wait); > return ret; > } > > long congestion_wait_interruptible(int rw, long timeout) > { > long ret = __congestion_wait(rw, timeout); > > if (signal_pending(current)) > ret = -ERESTARTSYS; > return ret; > } > > it's only infinitesimally less efficient..
All the other _interruptible functions check signal_pending before calling schedule. Which seems to make sense since its called in a loop anyway, and if the loop condition turns false when interrupted you might as well just finish up instead of bailing out.
However if you'd rather see your version, who am I to object ;-)
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