netdev - Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task

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Message-ID: <51B5418D-34FB-4E87-B87A-6C3FCDF8B21C@redhat.com>
Date:   Mon, 21 Nov 2022 09:34:43 -0500
From:   Benjamin Coddington <bcodding@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
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Subject: Re: [PATCH v1 2/3] Treewide: Stop corrupting socket's task_frag

On 21 Nov 2022, at 8:56, David Howells wrote:

> Benjamin Coddington <bcodding@...hat.com> wrote:
>
>> Since moving to memalloc_nofs_save/restore, SUNRPC has stopped setting the
>> GFP_NOIO flag on sk_allocation which the networking system uses to decide
>> when it is safe to use current->task_frag.
>
> Um, what's task_frag?

Its a per-task page_frag used to coalesce small writes for networking -- see:

5640f7685831 net: use a per task frag allocator

Ben