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From: Andrew Morton <akpm@linux-foundation.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-mm@kvack.org, Maxime Coquelin <maxime.coquelin@redhat.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Mike Rapoport <rppt@linux.vnet.ibm.com>
Subject: Re: [PATCH 1/1] userfaultfd: allow get_mempolicy(MPOL_F_NODE|MPOL_F_ADDR) to trigger userfaults
Date: Mon, 3 Sep 2018 16:33:12 -0700	[thread overview]
Message-ID: <20180903163312.4d758536e1208f8927d886e9@linux-foundation.org> (raw)
In-Reply-To: <20180831214848.23676-1-aarcange@redhat.com>

On Fri, 31 Aug 2018 17:48:48 -0400 Andrea Arcangeli <aarcange@redhat.com> wrote:

> get_mempolicy(MPOL_F_NODE|MPOL_F_ADDR) called a get_user_pages that
> would not be waiting for userfaults before failing and it would hit on
> a SIGBUS instead. Using get_user_pages_locked/unlocked instead will
> allow get_mempolicy to allow userfaults to resolve the fault and fill
> the hole, before grabbing the node id of the page.

What is the userspace visible impact of this change?

  parent reply	other threads:[~2018-09-03 23:33 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-31 21:48 [PATCH 1/1] userfaultfd: allow get_mempolicy(MPOL_F_NODE|MPOL_F_ADDR) to trigger userfaults Andrea Arcangeli
2018-09-02  6:15 ` Mike Rapoport
2018-09-03 23:33 ` Andrew Morton [this message]
2018-09-04  7:37   ` Mike Rapoport
2018-09-04 20:14   ` Andrea Arcangeli

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