netdev - RE: [PATCH] net : fix for dst_gc_task not getting scheduled if __dst

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Date:	Sat, 19 May 2012 14:48:28 +0000
From:	Gupta Rajan-B15745 <B15745@...escale.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] net : fix for dst_gc_task not getting scheduled if
 __dst_free() is called consistently

Ignore the patch. Issue is dst_gc_task is not getting
scheduled because of scheduling issue at 100% cpu utilization.

> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: Saturday, May 19, 2012 3:34 PM
> To: Gupta Rajan-B15745
> Cc: netdev@...r.kernel.org
> Subject: Re: [PATCH] net : fix for dst_gc_task not getting scheduled if
> __dst_free() is called consistently
> 
> On Sat, 2012-05-19 at 04:44 -0500, b15745@...escale.com wrote:
> > From: Rajan Gupta <b15745@...escale.com>
> >
> > dst_gc_work is cancelled and again rescheduled in __ds_free(). In case
> > __dsf_free() is consistently called dst_gc_work will never get called
> > resulting in memory not getting freed at all until one stops calling
> > __dst_free
> > Signed-off-by: Rajan Gupta <b15745@...escale.com>
> > ---
> >  net/core/dst.c |    1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/net/core/dst.c b/net/core/dst.c index 8246d47..6820206
> > 100644
> > --- a/net/core/dst.c
> > +++ b/net/core/dst.c
> > @@ -215,7 +215,6 @@ void __dst_free(struct dst_entry *dst)
> >  	if (dst_garbage.timer_inc > DST_GC_INC) {
> >  		dst_garbage.timer_inc = DST_GC_INC;
> >  		dst_garbage.timer_expires = DST_GC_MIN;
> > -		cancel_delayed_work(&dst_gc_work);
> >  		schedule_delayed_work(&dst_gc_work, dst_garbage.timer_expires);
> >  	}
> >  	spin_unlock_bh(&dst_garbage.lock);
> 
> Strange, I never met this....
> 
> Since "if (dst_garbage.timer_inc > DST_GC_INC)" will be false if timer_inc
> is DST_GC_INC.
> 
> 
>