On Thu, 2007-02-22 at 10:16 +0100, Peter Zijlstra wrote:
> On Wed, 2007-02-21 at 16:53 +0100, Arjan van de Ven wrote:
> > > Index: linux-2.6-git/kernel/softirq.c
> > > ===================================================================
> > > --- linux-2.6-git.orig/kernel/softirq.c 2006-12-14 10:02:18.000000000
> > > +0100
> > > +++ linux-2.6-git/kernel/softirq.c 2006-12-14 10:02:52.000000000
> > > +0100
> > > @@ -209,6 +209,8 @@ asmlinkage void __do_softirq(void)
> > > __u32 pending;
> > > int max_restart = MAX_SOFTIRQ_RESTART;
> > > int cpu;
> > > + unsigned long pflags = current->flags;
> > > + current->flags &= ~PF_MEMALLOC;
> > >
> > > pending = local_softirq_pending();
> > > account_system_vtime(current);
> > > @@ -247,6 +249,7 @@ restart:
> > >
> > > account_system_vtime(current);
> > > _local_bh_enable();
> > > + current->flags = pflags;
> >
> > this wipes out all the flags in one go.... evil.
> > What if something just selected this process for OOM killing? you nuke
> > that flag here again. Would be nicer if only the PF_MEMALLOC bit got
> > inherited in the restore path..
>
> would something like this:
>
> #define PF_PUSH(tsk, pflags, mask) \
> do { \
> (pflags) = ((tsk)->flags) & (mask); \
> } while (0)
>
>
> #define PF_POP(tsk, pflags, mask) \
> do { \
> ((tsk)->flags &= ~(mask); \
> ((tsk)->flags |= (pflags); \
> } while (0)
>
> be useful, or shall I just open code it in various places?
technically all you need is __get_bit and __set_bit() right?
(well a set_bit which sets to a value, not to always-1)
more generic name at least ;)
--
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