Re: [PATCH] mm/vmalloc.c: add a schedule point to vmalloc()

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 24 Jun 2014 15:18:57 -0700 (PDT) David Rientjes <rientjes@google.com> wrote:

> On Tue, 24 Jun 2014, Eric Dumazet wrote:
> 
> > diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> > index f64632b67196..05a145ed1332 100644
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -1602,6 +1602,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
> >  			goto fail;
> >  		}
> >  		area->pages[i] = page;
> > +		cond_resched();
> >  	}
> >  
> >  	if (map_vm_area(area, prot, &pages))
> 
> Now that we pass the gfp mask into vmalloc() and all allocations aren't 
> inherently GFP_KERNEL, I think this should only be done for (gfp_mask & 
> __GFP_WAIT).

spose so.

--- a/mm/vmalloc.c~mm-vmallocc-add-a-schedule-point-to-vmalloc-fix
+++ a/mm/vmalloc.c
@@ -1602,7 +1602,8 @@ static void *__vmalloc_area_node(struct
 			goto fail;
 		}
 		area->pages[i] = page;
-		cond_resched();
+		if (gfp_mask & __GFP_WAIT)
+			cond_resched();
 	}
 
 	if (map_vm_area(area, prot, &pages))