From: David Hildenbrand <david@redhat.com>
To: John Hubbard <jhubbard@nvidia.com>,
Jaewon Kim <jaewon31.kim@gmail.com>,
zhaoyang.huang@unisoc.com
Cc: surenb@google.com, linux-mm@kvack.org
Subject: Re: [RFC] pin_user_pages_fast failure count increased
Date: Mon, 28 Apr 2025 22:56:01 +0200 [thread overview]
Message-ID: <3d0b8c8b-b707-4a49-99f9-09aadfc27432@redhat.com> (raw)
In-Reply-To: <c7528304-7833-497c-8b83-e8e3e4a4240a@nvidia.com>
On 28.04.25 22:14, John Hubbard wrote:
> On 4/28/25 8:17 AM, Jaewon Kim wrote:
>> Hi
>>
>> If pin_user_pages_fast does not pin all the requested number of pages,
>> then drivers calling to pin_user_pages_fast should retry until the gup
>> pins all?
>>
>
> Approaches vary, for handling partial success of pin_user_pages().
>
> * Many drivers unpin everything and either bail out entirely, or retry
> pinning the entire original range.
Hm, unpinning + trying to repin the entire range can easily result in an
endless loop on persistent errors IIRC?
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-04-28 20:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-28 15:17 [RFC] pin_user_pages_fast failure count increased Jaewon Kim
2025-04-28 15:21 ` David Hildenbrand
2025-04-28 20:14 ` John Hubbard
2025-04-28 20:56 ` David Hildenbrand [this message]
2025-04-28 21:12 ` John Hubbard
2025-05-22 9:27 ` Hyesoo Yu
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