Re: [PATCH v2] mm/page_alloc: bail out on fatal signal during reclaim/compaction retry attempt

[Aaron Tomlin]

On Wed 2021-05-19 20:32 +0100, Matthew Wilcox wrote:
> On Wed, May 19, 2021 at 08:23:21PM +0100, Aaron Tomlin wrote:
> > +++ b/mm/page_alloc.c
> > @@ -4252,6 +4252,9 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
> >  	if (!order)
> >  		return false;
> >  
> > +	if (fatal_signal_pending(current))
> > +		goto out;
> 
> I think 'goto out' will be confusing.  It'll output a tracepoint, which
> isn't going to record that a fatal signal is pending, so it'll cause
> some head scratching for someone looking through the traces.  I
> think we should just return false here and skip the tracepoint.

I agree. Having said this, I do plan to send a patch to illustrate why
compaction should not retry to avoid possible confusion. Nevertheless, I am
happy to modify as per your request.


Kind regards,

-- 
Aaron Tomlin