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

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Message-Id: <20140624152524.f65d62a08538a63b3dc96838@linux-foundation.org>
Date:	Tue, 24 Jun 2014 15:25:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH] mm/vmalloc.c: add a schedule point to vmalloc()

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


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