linux-kernel - Re: [patch -mm] mm, hugetlb: schedule when potentially allocating many hugepages

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Date:   Fri, 9 Jun 2017 15:35:27 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch -mm] mm, hugetlb: schedule when potentially allocating
 many hugepages

On Wed, 7 Jun 2017, Mike Kravetz wrote:

> > @@ -2364,6 +2366,7 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
> >  			ret = alloc_fresh_gigantic_page(h, nodes_allowed);
> >  		else
> >  			ret = alloc_fresh_huge_page(h, nodes_allowed);
> > +		cond_resched();
> 
> Are not the following lines immediately before the above huge page allocation
> in set_max_huge_pages, or am I looking at an incorrect version of the file?
> 
> 		/* yield cpu to avoid soft lockup */
> 		cond_resched();

Ahh, we don't have this in our tree, thanks for catching it.  The other 
two cond_resched()'s are needed because we have reproduced them, so I'll 
send a v2.