linux-kernel - Re: [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4

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Message-ID: <84d83148-41a3-d0e8-be80-56187a8e8ccc@nvidia.com>
Date:   Tue, 11 Jul 2017 12:35:03 -0700
From:   Evgeny Baskakov <ebaskakov@...dia.com>
To:     Jerome Glisse <jglisse@...hat.com>
CC:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Sherry Cheung <SCheung@...dia.com>,
        Subhash Gutti <sgutti@...dia.com>
Subject: Re: [HMM 12/15] mm/migrate: new memory migration helper for use with
 device memory v4

On 7/11/17 11:49 AM, Jerome Glisse wrote:

>
> What are the symptoms ? The program just stop making any progress and you
> trigger a sysrequest to dump current states of each threads ? In this
> log i don't see migration_entry_wait() anymore but it seems to be waiting
> on page lock so there might be 2 issues here.
>
> Jérôme

That is correct, the program is not making any progress.

The stack traces in the kernel log are produced by a "sysrq w" (blocked 
tasks) command.

Thanks,

-- 
Evgeny Baskakov
NVIDIA