linux-kernel - Re: [patch v2 -mm] mm, hugetlb: schedule when potentially allocating many hugepages

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Message-Id: <3ceb6744-025d-86b9-4a71-beca86efa9e6@linux.vnet.ibm.com>
Date:   Thu, 6 Jul 2017 11:38:02 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Cc:     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 v2 -mm] mm, hugetlb: schedule when potentially allocating
 many hugepages

On 06/10/2017 04:06 AM, David Rientjes wrote:
> A few hugetlb allocators loop while calling the page allocator and can
> potentially prevent rescheduling if the page allocator slowpath is not
> utilized.
> 
> Conditionally schedule when large numbers of hugepages can be allocated.
> 
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Fixes a task which was getting hung while writing like 10000
hugepages (16MB on POWER8) into /proc/sys/vm/nr_hugepages.

Tested-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>